-
question_answer1)
The number of electrons in an atom of an element is equal to its [BHU 1979]
A)
Atomic weight done
clear
B)
Atomic number done
clear
C)
Equivalent weight done
clear
D)
Electron affinity done
clear
View Solution play_arrow
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question_answer2)
The nucleus of the element having atomic number 25 and atomic weight 55 will contain [CPMT 1986; MP PMT 1987]
A)
25 protons and 30 neutrons done
clear
B)
25 neutrons and 30 protons done
clear
C)
55 protons done
clear
D)
55 neutrons done
clear
View Solution play_arrow
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question_answer3)
If W is atomic weight and N is the atomic number of an element, then [CPMT 1971, 80, 89]
A)
Number of \[{{e}^{-1}}=W-N\] done
clear
B)
Number of \[_{0}{{n}^{1}}=W-N\] done
clear
C)
Number of \[_{1}{{H}^{1}}=W-N\] done
clear
D)
Number of \[_{0}{{n}^{1}}=N\] done
clear
View Solution play_arrow
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question_answer4)
The total number of neutrons in dipositive zinc ions with mass number 70 is [IIT 1979; Bihar MEE 1997]
A)
34 done
clear
B)
40 done
clear
C)
36 done
clear
D)
38 done
clear
View Solution play_arrow
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question_answer5)
Which of the following are isoelectronic with one another [NCERT 1983; EAMCET 1989]
A)
\[N{{a}^{+}}\] and \[Ne\] done
clear
B)
\[{{K}^{+}}\] and \[O\] done
clear
C)
\[Ne\] and \[O\] done
clear
D)
\[N{{a}^{+}}\] and \[{{K}^{+}}\] done
clear
View Solution play_arrow
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question_answer6)
The number of electrons in one molecule of \[C{{O}_{2}}\]are [IIT 1979; MP PMT 1994; RPMT 1999]
A)
22 done
clear
B)
44 done
clear
C)
66 done
clear
D)
88 done
clear
View Solution play_arrow
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question_answer7)
Chlorine atom differs from chloride ion in the number of [NCERT 1972; MP PMT 1995]
A)
Proton done
clear
B)
Neutron done
clear
C)
Electrons done
clear
D)
Protons and electrons done
clear
View Solution play_arrow
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question_answer8)
\[CO\] has same electrons as or the ion that is isoelectronic with \[CO\] is [CPMT 1984; IIT 1982; EAMCET 1990; CBSE PMT 1997]
A)
\[N_{2}^{+}\] done
clear
B)
\[C{{N}^{-}}\] done
clear
C)
\[O_{2}^{+}\] done
clear
D)
\[O_{2}^{-}\] done
clear
View Solution play_arrow
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question_answer9)
The mass of an atom is constituted mainly by [DPMT 1984, 91; AFMC 1990]
A)
Neutron and neutrino done
clear
B)
Neutron and electron done
clear
C)
Neutron and proton done
clear
D)
Proton and electron done
clear
View Solution play_arrow
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question_answer10)
The atomic number of an element represents [CPMT 1983; CBSE PMT 1990; NCERT 1973; AMU 1984]
A)
Number of neutrons in the nucleus done
clear
B)
Number of protons in the nucleus done
clear
C)
Atomic weight of element done
clear
D)
Valency of element done
clear
View Solution play_arrow
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question_answer11)
An atom has 26 electrons and its atomic weight is 56. The number of neutrons in the nucleus of the atom will be [CPMT 1980]
A)
26 done
clear
B)
30 done
clear
C)
36 done
clear
D)
56 done
clear
View Solution play_arrow
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question_answer12)
The most probable radius (in pm) for finding the electron in \[H{{e}^{+}}\] is [AIIMS 2005]
A)
0.0 done
clear
B)
52.9 done
clear
C)
26.5 done
clear
D)
105.8 done
clear
View Solution play_arrow
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question_answer13)
The number of unpaired electrons in the \[F{{e}^{2+}}\] ion is [MP PET 1989; KCET 2000]
A)
0 done
clear
B)
4 done
clear
C)
6 done
clear
D)
3 done
clear
View Solution play_arrow
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question_answer14)
A sodium cation has different number of electrons from
A)
\[{{O}^{2-}}\] done
clear
B)
\[{{F}^{-}}\] done
clear
C)
\[L{{i}^{+}}\] done
clear
D)
\[A{{l}^{+3}}\] done
clear
View Solution play_arrow
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question_answer15)
An atom which has lost one electron would be [CPMT 1986]
A)
Negatively charged done
clear
B)
Positively charged done
clear
C)
Electrically neutral done
clear
D)
Carry double positive charge done
clear
View Solution play_arrow
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question_answer16)
Number of electrons in the outermost orbit of the element of atomic number 15 is [CPMT 1988, 93]
A)
1 done
clear
B)
3 done
clear
C)
5 done
clear
D)
7 done
clear
View Solution play_arrow
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question_answer17)
The atomic weight of an element is double its atomic number. If there are four electrons in \[2p\] orbital, the element is [AMU 1983]
A)
\[C\] done
clear
B)
\[N\] done
clear
C)
\[O\] done
clear
D)
\[Ca\] done
clear
View Solution play_arrow
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question_answer18)
An atom has the electronic configuration of \[1{{s}^{2}},2{{s}^{2}}2{{p}^{6}}\], \[3{{s}^{2}}3{{p}^{6}}3{{d}^{10}},4{{s}^{2}}4{{p}^{5}}\]. Its atomic weight is 80. Its atomic number and the number of neutrons in its nucleus shall be [MP PMT 1987]
A)
35 and 45 done
clear
B)
45 and 35 done
clear
C)
40 and 40 done
clear
D)
30 and 50 done
clear
View Solution play_arrow
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question_answer19)
Which of the following particles has more electrons than neutrons
A)
\[C\] done
clear
B)
\[{{F}^{-}}\] done
clear
C)
\[{{O}^{-2}}\] done
clear
D)
\[A{{l}^{+3}}\] done
clear
View Solution play_arrow
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question_answer20)
Compared with an atom of atomic weight 12 and atomic number 6, the atom of atomic weight 13 and atomic number 6 [NCERT 1971]
A)
Contains more neutrons done
clear
B)
Contains more electrons done
clear
C)
Contains more protons done
clear
D)
Is a different element done
clear
View Solution play_arrow
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question_answer21)
In the nucleus of \[_{20}C{{a}^{40}}\] there are [CPMT 1990; EAMCET 1991]
A)
40 protons and 20 electrons done
clear
B)
20 protons and 40 electrons done
clear
C)
20 protons and 20 neutrons done
clear
D)
20 protons and 40 neutrons done
clear
View Solution play_arrow
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question_answer22)
\[N{{a}^{+}}\]ion is isoelectronic with [CPMT 1990]
A)
\[L{{i}^{+}}\] done
clear
B)
\[M{{g}^{+2}}\] done
clear
C)
\[C{{a}^{+2}}\] done
clear
D)
\[B{{a}^{+2}}\] done
clear
View Solution play_arrow
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question_answer23)
\[Ca\] has atomic no. 20 and atomic weight 40. Which of the following statements is not correct about \[Ca\]atom [MP PET 1993]
A)
The number of electrons is same as the number of neutrons done
clear
B)
The number of nucleons is double of the number of electrons done
clear
C)
The number of protons is half of the number of neutrons done
clear
D)
The number of nucleons is double of the atomic number done
clear
View Solution play_arrow
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question_answer24)
Pick out the isoelectronic structures from the following \[\underset{\text{I}}{\mathop{CH_{3}^{+}}}\,\] \[\underset{\text{II}}{\mathop{{{H}_{3}}{{O}^{+}}}}\,\] \[\underset{\text{III}}{\mathop{N{{H}_{3}}}}\,\] \[\underset{\text{IV}}{\mathop{CH_{3}^{-}}}\,\] [IIT 1993]
A)
I and II done
clear
B)
I and IV done
clear
C)
I and III done
clear
D)
II, III and IV done
clear
View Solution play_arrow
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question_answer25)
Number of electrons in \[-CON{{H}_{2}}\] is [AMU 1988]
A)
22 done
clear
B)
24 done
clear
C)
20 done
clear
D)
28 done
clear
View Solution play_arrow
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question_answer26)
The atomic number of an element having the valency shell electronic configuration \[4{{s}^{2}}4{{p}^{6}}\] is [MP PMT 1991]
A)
35 done
clear
B)
36 done
clear
C)
37 done
clear
D)
38 done
clear
View Solution play_arrow
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question_answer27)
The present atomic weight scale is based on [EAMCET 1988; MP PMT 2002]
A)
\[{{C}^{12}}\] done
clear
B)
\[{{O}^{16}}\] done
clear
C)
\[{{H}^{1}}\] done
clear
D)
\[{{C}^{13}}\] done
clear
View Solution play_arrow
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question_answer28)
Isoelectronic species are [EAMCET 1989]
A)
\[{{K}^{+}},\,C{{l}^{-}}\] done
clear
B)
\[N{{a}^{+}},\,C{{l}^{-}}\] done
clear
C)
\[Na,\,Ar\] done
clear
D)
\[N{{a}^{+}},\,Ar\] done
clear
View Solution play_arrow
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question_answer29)
If the atomic weight of an element is 23 times that of the lightest element and it has 11 protons, then it contains [EAMCET 1986; AFMC 1989]
A)
11 protons, 23 neutrons, 11 electrons done
clear
B)
11 protons, 11 neutrons, 11 electrons done
clear
C)
11 protons, 12 neutrons, 11 electrons done
clear
D)
11 protons, 11 neutrons, 23 electrons done
clear
View Solution play_arrow
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question_answer30)
Which of the following oxides of nitrogen is isoelectronic with \[C{{O}_{2}}\] [CBSE PMT 1990]
A)
\[N{{O}_{2}}\] done
clear
B)
\[{{N}_{2}}O\] done
clear
C)
\[NO\] done
clear
D)
\[{{N}_{2}}{{O}_{2}}\] done
clear
View Solution play_arrow
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question_answer31)
The ratio between the neutrons in \[C\] and \[Si\] with respect to atomic masses 12 and 28 is [EAMCET 1990]
A)
2 : 3 done
clear
B)
3 : 2 done
clear
C)
3 : 7 done
clear
D)
7 : 3 done
clear
View Solution play_arrow
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question_answer32)
The atomic number of an element is always equal to [MP PMT 1994]
A)
Atomic weight divided by 2 done
clear
B)
Number of neutrons in the nucleus done
clear
C)
Weight of the nucleus done
clear
D)
Electrical charge of the nucleus done
clear
View Solution play_arrow
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question_answer33)
Which of the following is isoelectronic with carbon atom [MP PMT 1994; UPSEAT 2000]
A)
\[N{{a}^{+}}\] done
clear
B)
\[A{{l}^{3+}}\] done
clear
C)
\[{{O}^{2-}}\] done
clear
D)
\[{{N}^{+}}\] done
clear
View Solution play_arrow
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question_answer34)
\[C{{O}_{2}}\] is isostructural with [IIT 1986; MP PMT 1986, 94, 95]
A)
\[SnC{{l}_{2}}\] done
clear
B)
\[S{{O}_{2}}\] done
clear
C)
\[HgC{{l}_{2}}\] done
clear
D)
All the above done
clear
View Solution play_arrow
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question_answer35)
The hydride ions \[({{H}^{-}})\] are isoelectronic with [AFMC 1995; Bihar MEE 1997]
A)
\[Li\] done
clear
B)
\[H{{e}^{+}}\] done
clear
C)
\[He\] done
clear
D)
\[Be\] done
clear
View Solution play_arrow
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question_answer36)
The number of electrons in the nucleus of \[{{C}^{12}}\] is [AFMC 1995]
A)
6 done
clear
B)
12 done
clear
C)
0 done
clear
D)
3 done
clear
View Solution play_arrow
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question_answer37)
An element has electronic configuration 2, 8, 18, 1. If its atomic weight is 63, then how many neutrons will be present in its nucleus
A)
30 done
clear
B)
32 done
clear
C)
34 done
clear
D)
33 done
clear
View Solution play_arrow
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question_answer38)
The nucleus of the element \[_{21}{{E}^{45}}\] contains
A)
45 protons and 21 neutrons done
clear
B)
21 protons and 24 neutrons done
clear
C)
21 protons and 45 neutrons done
clear
D)
24 protons and 21 neutrons done
clear
View Solution play_arrow
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question_answer39)
Neutrons are found in atoms of all elements except in [MP PMT 1997]
A)
Chlorine done
clear
B)
Oxygen done
clear
C)
Argon done
clear
D)
Hydrogen done
clear
View Solution play_arrow
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question_answer40)
The mass number of an anion, \[{{X}^{3-}}\], is 14. If there are ten electrons in the anion, the number of neutrons in the nucleus of atom, \[{{X}_{2}}\] of the element will be [MP PMT 1999]
A)
10 done
clear
B)
14 done
clear
C)
7 done
clear
D)
5 done
clear
View Solution play_arrow
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question_answer41)
Which of the following are isoelectronic species \[I=CH_{3}^{+},\,II-N{{H}_{2}},\,III-NH_{4}^{+},\,IV-N{{H}_{3}}\] [CPMT 1999]
A)
I, II, III done
clear
B)
II, III, IV done
clear
C)
I, II, IV done
clear
D)
I and II done
clear
View Solution play_arrow
-
question_answer42)
The charge on the atom containing 17 protons, 18 neutrons and 18 electrons is [AIIMS 1996]
A)
\[+1\] done
clear
B)
\[-2\] done
clear
C)
\[-1\] done
clear
D)
Zero done
clear
View Solution play_arrow
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question_answer43)
Number of unpaired electrons in inert gas is [CPMT 1996]
A)
Zero done
clear
B)
8 done
clear
C)
4 done
clear
D)
18 done
clear
View Solution play_arrow
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question_answer44)
In neutral atom, which particles are equivalent [RPMT 1997]
A)
\[{{p}^{+}},\,{{e}^{+}}\] done
clear
B)
\[{{e}^{-}},\,{{e}^{+}}\] done
clear
C)
\[{{e}^{-}},{{p}^{+}}\] done
clear
D)
\[{{p}^{+}},{{n}^{o}}\] done
clear
View Solution play_arrow
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question_answer45)
Nuclei tend to have more neutrons than protons at high mass numbers because [Roorkee Qualifying 1998]
A)
Neutrons are neutral particles done
clear
B)
Neutrons have more mass than protons done
clear
C)
More neutrons minimize the coulomb repulsion done
clear
D)
Neutrons decrease the binding energy done
clear
View Solution play_arrow
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question_answer46)
Which one of the following is not isoelectronic with \[{{O}^{2-}}\] [CBSE PMT 1994]
A)
\[{{N}^{3-}}\] done
clear
B)
\[{{F}^{-}}\] done
clear
C)
\[T{{l}^{+}}\] done
clear
D)
\[N{{a}^{+}}\] done
clear
View Solution play_arrow
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question_answer47)
The number of electrons in \[{{[_{19}^{40}K]}^{-1}}\] is [CPMT 1997; AFMC 1999]
A)
19 done
clear
B)
20 done
clear
C)
18 done
clear
D)
40 done
clear
View Solution play_arrow
-
question_answer48)
The number of electrons and neutrons of an element is 18 and 20 respectively. Its mass number is [CPMT 1997; Pb. PMT 1999; MP PMT 1999]
A)
17 done
clear
B)
37 done
clear
C)
2 done
clear
D)
38 done
clear
View Solution play_arrow
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question_answer49)
Number of protons, neutrons and electrons in the element \[_{89}^{231}Y\] is [AFMC 1997]
A)
89, 231, 89 done
clear
B)
89, 89, 242 done
clear
C)
89, 142, 89 done
clear
D)
89, 71, 89 done
clear
View Solution play_arrow
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question_answer50)
\[B{{e}^{2+}}\] is isoelectronic with [EAMCET 1998]
A)
\[M{{g}^{2+}}\] done
clear
B)
\[N{{a}^{+}}\] done
clear
C)
\[L{{i}^{+}}\] done
clear
D)
\[{{H}^{+}}\] done
clear
View Solution play_arrow
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question_answer51)
An isostere is [UPSEAT 1999]
A)
\[NO_{2}^{-}\] and \[{{O}_{3}}\] done
clear
B)
\[NO_{2}^{-}\] and \[PO_{4}^{3-}\] done
clear
C)
\[C{{O}_{2}},\,{{N}_{2}}O,\,NO_{3}^{-}\] done
clear
D)
\[ClO_{4}^{-}\] and \[OC{{N}^{-}}\] done
clear
View Solution play_arrow
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question_answer52)
Nitrogen atom has an atomic number of 7 and oxygen has an atomic number 8. The total number of electrons in a nitrate ion will be [Pb. PMT 2000]
A)
8 done
clear
B)
16 done
clear
C)
32 done
clear
D)
64 done
clear
View Solution play_arrow
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question_answer53)
If molecular mass and atomic mass of sulphur are 256 and 32 respectively, its atomicity is [RPET 2000]
A)
2 done
clear
B)
8 done
clear
C)
4 done
clear
D)
16 done
clear
View Solution play_arrow
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question_answer54)
The nitride ion in lithium nitride is composed of [KCET 2000]
A)
7 protons + 10 electrons done
clear
B)
10 protons + 10 electrons done
clear
C)
7 protons + 7 protons done
clear
D)
10 protons + 7 electrons done
clear
View Solution play_arrow
-
question_answer55)
The atomic number of an element is 17. The number of orbitals containing electron pairs in its valence shell is [CPMT 2001]
A)
Eight done
clear
B)
Six done
clear
C)
Three done
clear
D)
Two done
clear
View Solution play_arrow
-
question_answer56)
The atomic number of an element is 35 and mass number is 81. The number of electrons in the outer most shell is [UPSEAT 2001]
A)
7 done
clear
B)
6 done
clear
C)
5 done
clear
D)
3 done
clear
View Solution play_arrow
-
question_answer57)
Which of the following is not isoelectronic [MP PET 2002]
A)
\[N{{a}^{+}}\] done
clear
B)
\[M{{g}^{2+}}\] done
clear
C)
\[{{O}^{2-}}\] done
clear
D)
\[C{{l}^{-}}\] done
clear
View Solution play_arrow
-
question_answer58)
The charge of an electron is \[-1.6\times {{10}^{-19}}C.\] The value of free charge on \[L{{i}^{+}}\]ion will be [AFMC 2002; KCET (Engg.) 2002]
A)
\[3.6\times {{10}^{-19}}C\] done
clear
B)
\[1\times {{10}^{-19}}C\] done
clear
C)
\[1.6\times {{10}^{-19}}C\] done
clear
D)
\[2.6\times {{10}^{-19}}C\] done
clear
View Solution play_arrow
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question_answer59)
Iso-electronic species is [RPMT 2002]
A)
\[{{F}^{-}},\,\,{{O}^{-2}}\] done
clear
B)
\[{{F}^{-}},\,\,O\] done
clear
C)
\[{{F}^{-}},\,\,{{O}^{+}}\] done
clear
D)
\[{{F}^{-}},\,\,{{O}^{+2}}\] done
clear
View Solution play_arrow
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question_answer60)
An element have atomic weight 40 and it?s electronic configuration is \[1{{s}^{2}}2{{s}^{2}}2{{p}^{6}}3{{s}^{2}}3{{p}^{6}}.\] Then its atomic number and number of neutrons will be [RPMT 2002]
A)
18 and 22 done
clear
B)
22 and 18 done
clear
C)
26 and 20 done
clear
D)
40 and 18 done
clear
View Solution play_arrow
-
question_answer61)
The nucleus of tritium contains [MP PMT 2002]
A)
1 proton + 1 neutron done
clear
B)
1 proton + 3 neutron done
clear
C)
1 proton + 0 neutron done
clear
D)
1 proton + 2 neutron done
clear
View Solution play_arrow
-
question_answer62)
Which one of the following groupings represents a collection of isoelectronic species [AIEEE 2003]
A)
\[N{{a}^{+}},\,C{{a}^{2+}},M{{g}^{2+}}\] done
clear
B)
\[{{N}^{3-}},\,{{F}^{-}},\,N{{a}^{+}}\] done
clear
C)
\[Be,\,A{{l}^{3+}},\,C{{l}^{-}}\] done
clear
D)
\[C{{a}^{2+}},\,C{{s}^{+}},\,Br\] done
clear
View Solution play_arrow
-
question_answer63)
Which of the following are isoelectronic and isostructural \[NO_{3}^{-},\,CO_{3}^{2-},\,ClO_{3}^{-},\,S{{O}_{3}}\] [IIT Screening 2003]
A)
\[NO_{3}^{-},\,CO_{3}^{2-}\] done
clear
B)
\[S{{O}_{3}},\,NO_{3}^{-}\] done
clear
C)
\[ClO_{3}^{-},\,CO_{3}^{2-}\] done
clear
D)
\[CO_{3}^{2-},\,S{{O}_{3}}\] done
clear
View Solution play_arrow
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question_answer64)
The number of electrons in \[C{{l}^{-}}\] ion is [MP PMT 2003]
A)
19 done
clear
B)
20 done
clear
C)
18 done
clear
D)
35 done
clear
View Solution play_arrow
-
question_answer65)
The number of neutron in tritium is [CPMT 2003]
A)
1 done
clear
B)
2 done
clear
C)
3 done
clear
D)
0 done
clear
View Solution play_arrow
-
question_answer66)
Tritium is the isotope of [CPMT 2003]
A)
Hydrogen done
clear
B)
Oxygen done
clear
C)
Carbon done
clear
D)
Sulpher done
clear
View Solution play_arrow
-
question_answer67)
The atomic number of an element is 35. What is the total number of electrons present in all the p-orbitals of the ground state atom of that element [EAMCET (Engg.) 2003]
A)
6 done
clear
B)
11 done
clear
C)
17 done
clear
D)
23 done
clear
View Solution play_arrow
-
question_answer68)
The nucleus of an element contain 9 protons. Its valency would be [MP PET 2004]
A)
1 done
clear
B)
3 done
clear
C)
2 done
clear
D)
5 done
clear
View Solution play_arrow
-
question_answer69)
The compound in which cation is isoelectronic with anion is [UPSEAT 2004]
A)
\[NaCl\] done
clear
B)
\[CsF\] done
clear
C)
\[NaI\] done
clear
D)
\[{{K}_{2}}S\] done
clear
View Solution play_arrow
-
question_answer70)
Which among the following species have the same number of electrons in its outermost as well as penultimate shell [DCE 2004]
A)
\[M{{g}^{2+}}\] done
clear
B)
\[{{O}^{2-}}\] done
clear
C)
\[{{F}^{-}}\] done
clear
D)
\[C{{a}^{2+}}\] done
clear
View Solution play_arrow
-
question_answer71)
Six protons are found in the nucleus of [CPMT 1977, 80, 81; NCERT 1975, 78]
A)
Boron done
clear
B)
Lithium done
clear
C)
Carbon done
clear
D)
Helium done
clear
View Solution play_arrow
-
question_answer72)
The nitrogen atom has 7 protons and 7 electrons, the nitride ion \[({{N}^{3-}})\]will have [NCERT 1977]
A)
7 protons and 10 electrons done
clear
B)
4 protons and 7 electrons done
clear
C)
4 protons and 10 electrons done
clear
D)
10 protons and 7 electrons done
clear
View Solution play_arrow
-
question_answer73)
Number of neutrons in heavy hydrogen atom is [MP PMT 1986]
A)
0 done
clear
B)
1 done
clear
C)
2 done
clear
D)
3 done
clear
View Solution play_arrow
-
question_answer74)
Which of the following is always a whole number [CPMT 1976, 81, 86]
A)
Atomic weight done
clear
B)
Atomic radii done
clear
C)
Equivalent weight done
clear
D)
Atomic number done
clear
View Solution play_arrow