-
question_answer1)
Which property of an element is always a whole number [MP PMT 1986]
A)
Atomic weight done
clear
B)
Equivalent weight done
clear
C)
Atomic number done
clear
D)
Atomic volume done
clear
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question_answer2)
Which one of the following properties of an element is not variable [Bihar MADT 1981]
A)
Valency done
clear
B)
Atomic weight done
clear
C)
Equivalent weight done
clear
D)
All of these done
clear
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question_answer3)
The modern atomic weight scale is based on [MP PMT 2002]
A)
\[{{C}^{12}}\] done
clear
B)
\[{{O}^{16}}\] done
clear
C)
\[{{H}^{1}}\] done
clear
D)
\[{{C}^{13}}\] done
clear
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question_answer4)
1 amu is equal to
A)
\[\frac{1}{12}\text{of }C-12\] done
clear
B)
\[\frac{1}{14}\text{of O-16}\] done
clear
C)
\[1g\text{ of }{{H}_{2}}\] done
clear
D)
\[1.66\times {{10}^{-23}}\]kg done
clear
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question_answer5)
Sulphur forms the chlorides\[{{S}_{2}}C{{l}_{2}}\text{ and }SC{{l}_{2}}\]. The equivalent mass of sulphur in \[SC{{l}_{2}}\]is [EAMCET 1985; Pb. CET 2001]
A)
8 g/mole done
clear
B)
16 g/mole done
clear
C)
64.8 g/mole done
clear
D)
32 g/mole done
clear
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question_answer6)
The sulphate of a metal M contains 9.87% of M. This sulphate is isomorphous with \[ZnS{{O}_{4}}.7{{H}_{2}}O\]. The atomic weight of M is [IIT 1991]
A)
40.3 done
clear
B)
36.3 done
clear
C)
24.3 done
clear
D)
11.3 done
clear
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question_answer7)
When 100 ml of 1\[M\,NaOH\]solution and 10 ml of 10\[N\,{{H}_{2}}S{{O}_{4}}\]solution are mixed together, the resulting solution will be [DPMT 1982]
A)
Alkaline done
clear
B)
Acidic done
clear
C)
Strongly acidic done
clear
D)
Neutral done
clear
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question_answer8)
In chemical scale, the relative mass of the isotopic mixture of oxygen atoms \[({{O}^{16}},\,{{O}^{17}},\,{{O}^{18}})\] is assumed to be equal to [Bihar MADT 1981]
A)
16.002 done
clear
B)
16.00 done
clear
C)
17.00 done
clear
D)
11.00 done
clear
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question_answer9)
For preparing 0.1 N solution of a compound from its impure sample of which the percentage purity is known, the weight of the substance required will be [MP PET 1996]
A)
More than the theoretical weight done
clear
B)
Less than the theoretical weight done
clear
C)
Same as the theoretical weight done
clear
D)
None of these done
clear
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question_answer10)
1 mol of \[C{{H}_{4}}\]contains
A)
\[6.02\times {{10}^{23}}\]atoms of H done
clear
B)
4 g atom of Hydrogen done
clear
C)
\[1.81\times {{10}^{23}}\]molecules of \[C{{H}_{4}}\] done
clear
D)
3.0 g of carbon done
clear
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question_answer11)
In the reaction \[2N{{a}_{2}}{{S}_{2}}{{O}_{3}}+{{I}_{2}}\to N{{a}_{2}}{{S}_{4}}{{O}_{6}}+2NaI\], the equivalent weight of \[N{{a}_{2}}{{S}_{2}}{{O}_{3}}\](mol. wt. = M) is equal to
A)
M done
clear
B)
\[M/2\] done
clear
C)
\[M/3\] done
clear
D)
\[M/4\] done
clear
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question_answer12)
When potassium permanganate is titrated against ferrous ammonium sulphate, the equivalent weight of potassium permanganate is [CPMT 1988]
A)
Molecular weight /10 done
clear
B)
Molecular weight /5 done
clear
C)
Molecular weight /2 done
clear
D)
Molecular weight done
clear
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question_answer13)
Boron has two stable isotopes, \[^{10}B\](19%) and \[^{11}B\](81%). The atomic mass that should appear for boron in the periodic table is [CBSE PMT 1990]
A)
10.8 done
clear
B)
10.2 done
clear
C)
11.2 done
clear
D)
10.0 done
clear
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question_answer14)
What is the concentration of nitrate ions if equal volumes of 0.1 \[M\,AgN{{O}_{3}}\]and 0.1 \[M\,NaCl\]are mixed together [CPMT 1983; NCERT 1985]
A)
0.1 M done
clear
B)
0.2 M done
clear
C)
0.05 M done
clear
D)
0.25 M done
clear
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question_answer15)
Total number of atoms represented by the compound CuSO4.5H2O is [BHU 2005]
A)
27 done
clear
B)
21 done
clear
C)
5 done
clear
D)
8 done
clear
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question_answer16)
74.5 g of a metallic chloride contain 35.5 g of chlorine. The equivalent weight of the metal is [CPMT 1986]
A)
19.5 done
clear
B)
35.5 done
clear
C)
39.0 done
clear
D)
78.0 done
clear
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question_answer17)
7.5 grams of a gas occupy 5.8 litres of volume at STP the gas is
A)
\[NO\] done
clear
B)
\[{{N}_{2}}O\] done
clear
C)
\[CO\] done
clear
D)
\[C{{O}_{2}}\] done
clear
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question_answer18)
The number of atoms in 4.25 g of \[N{{H}_{3}}\]is approximately [CBSE PMT 1999; MH CET 2003]
A)
\[1\times {{10}^{23}}\] done
clear
B)
\[2\times {{10}^{23}}\] done
clear
C)
\[4\times {{10}^{23}}\] done
clear
D)
\[6\times {{10}^{23}}\] done
clear
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question_answer19)
One litre of a gas at STP weight 1.16 g it can possible be [AMU 1992]
A)
\[{{C}_{2}}{{H}_{2}}\] done
clear
B)
\[CO\] done
clear
C)
\[{{O}_{2}}\] done
clear
D)
\[C{{H}_{4}}\] done
clear
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question_answer20)
The vapour density of a gas is 11.2. The volume occupied by 11.2 g of the gas at ATP will be [Bihar CET 1995]
A)
11.2 L done
clear
B)
22.4 L done
clear
C)
1 L done
clear
D)
44.8 L done
clear
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question_answer21)
Equivalent weight of crystalline oxalic acid is [MP PMT 1995]
A)
30 done
clear
B)
63 done
clear
C)
53 done
clear
D)
45 done
clear
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question_answer22)
The equivalent weight of an element is 4. Its chloride has a V.D 59.25. Then the valency of the element is [BHU 1997]
A)
4 done
clear
B)
3 done
clear
C)
2 done
clear
D)
1 done
clear
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question_answer23)
1.25 g of a solid dibasic acid is completely neutralised by 25 ml of 0.25 molar \[Ba{{(OH)}_{2}}\]solution. Molecular mass of the acid is
A)
100 done
clear
B)
150 done
clear
C)
120 done
clear
D)
200 done
clear
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question_answer24)
The oxide of a metal has 32% oxygen. Its equivalent weight would be [MP PMT 1985]
A)
34 done
clear
B)
32 done
clear
C)
17 done
clear
D)
8 done
clear
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question_answer25)
The mass of a molecule of water is [Bihar CEE 1995]
A)
\[3\times {{10}^{-26}}\]kg done
clear
B)
\[3\times {{10}^{-25}}\]kg done
clear
C)
\[1.5\times {{10}^{-26}}\]kg done
clear
D)
\[2.5\times {{10}^{-26}}\]kg done
clear
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question_answer26)
1.24 gm P is present in 2.2 gm
A)
\[{{P}_{4}}{{S}_{3}}\] done
clear
B)
\[{{P}_{2}}{{S}_{2}}\] done
clear
C)
\[P{{S}_{2}}\] done
clear
D)
\[{{P}_{2}}{{S}_{4}}\] done
clear
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question_answer27)
The atomic weights of two elements A and B are 40 and 80 respectively. If x g of A contains y atoms, how many atoms are present in 2x g of B
A)
\[\frac{y}{2}\] done
clear
B)
\[\frac{y}{4}\] done
clear
C)
y done
clear
D)
2y done
clear
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question_answer28)
Assuming fully decomposed, the volume of \[C{{O}_{2}}\]released at STP on heating 9.85g of \[BaC{{O}_{3}}\](Atomic mass of Ba=137) will be [CBSE PMT 2000]
A)
0.84 L done
clear
B)
2.24 L done
clear
C)
4.06 L done
clear
D)
1.12 L done
clear
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question_answer29)
If \[{{N}_{A}}\]is Avogadro?s number then number of valence electrons in 4.2 g of nitride ions \[({{N}^{3-}})\]
A)
2.4 \[{{N}_{A}}\] done
clear
B)
4.2 \[{{N}_{A}}\] done
clear
C)
\[1.6\,{{N}_{A}}\] done
clear
D)
\[3.2\,{{N}_{A}}\] done
clear
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question_answer30)
The weight of \[1\times {{10}^{22}}\]molecules of \[CuS{{O}_{4}}.5{{H}_{2}}O\]is [IIT 1991]
A)
41.59 g done
clear
B)
415.9 g done
clear
C)
4.159 g done
clear
D)
None of these done
clear
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question_answer31)
Rearrange the following (I to IV) in the order of increasing masses and choose the correct answer from A, B, C and D (Atomic mass: N=14, O=16, Cu=63). 1 molecule of oxygen 1 atom of nitrogen \[1\times {{10}^{-10}}\]g molecular weight of oxygen \[1\times {{10}^{-10}}\]g atomic weight of copper
A)
II<I<III<IV done
clear
B)
IV<III<II<I done
clear
C)
II<III<I<IV done
clear
D)
III<IV<I<II done
clear
View Solution play_arrow
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question_answer32)
1.520 g of the hydroxide of a metal on ignition gave 0.995 gm of oxide. The equivalent weight of metal is [DPMT 1984]
A)
1.520 done
clear
B)
0.995 done
clear
C)
19.00 done
clear
D)
9.00 done
clear
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question_answer33)
How much coulomb charge is present on 1g ion of \[{{N}^{3-}}\]
A)
\[5.2\times {{10}^{6}}\]Couloumb done
clear
B)
\[2.894\times {{10}^{5}}\]Couloumb done
clear
C)
\[6.6\times {{10}^{6}}\]Couloumb done
clear
D)
\[8.2\times {{10}^{6}}\]Couloumb done
clear
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question_answer34)
Ratio of \[{{C}_{p}}\]and \[{{C}_{v}}\]of a gas X is 1.4, the number of atom of the gas ?X? present in 11.2 litres of it at NTP will be [CBSE 1999]
A)
\[6.02\times {{10}^{23}}\] done
clear
B)
\[1.2\times {{10}^{23}}\] done
clear
C)
\[3.01\times {{10}^{23}}\] done
clear
D)
\[2.01\times {{10}^{23}}\] done
clear
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question_answer35)
If we consider that 1/6, in place of 1/12, mass of carbon atom is taken to be the relative atomic mass unit, the mass of one mole of a substance will [AIEEE 2005]
A)
Decrease twice done
clear
B)
Increase two fold done
clear
C)
Remain unchanged done
clear
D)
Be a function of the molecular mass of the substance done
clear
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question_answer36)
What should be the equivalent weight of phosphorous acid, if P=31; O=16; H=1
A)
82 done
clear
B)
41 done
clear
C)
20.5 done
clear
D)
None of these done
clear
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question_answer37)
The number of molecule at NTP in 1 ml of an ideal gas will be
A)
\[6\times {{10}^{23}}\] done
clear
B)
\[2.69\times {{10}^{19}}\] done
clear
C)
\[2.69\times {{10}^{23}}\] done
clear
D)
None of these done
clear
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question_answer38)
The specific heat of a metal is 0.16 its approximate atomic weight would be
A)
32 done
clear
B)
16 done
clear
C)
40 done
clear
D)
64 done
clear
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question_answer39)
The weight of a molecule of the compound \[{{C}_{60}}{{H}_{122}}\]is [AIIMS 2000]
A)
\[1.4\times {{10}^{-21}}\]g done
clear
B)
\[1.09\times {{10}^{-21}}\]g done
clear
C)
\[5.025\times {{10}^{23}}\]g done
clear
D)
\[16.023\times {{10}^{23}}\]g done
clear
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question_answer40)
What is the weight of oxygen required for the complete combustion of 2.8 kg of ethylene [CBSE PMT 1989]
A)
2.8 kg done
clear
B)
6.4 kg done
clear
C)
9.6 kg done
clear
D)
96 kg done
clear
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question_answer41)
What volume of \[N{{H}_{3}}\]gas at STP would be needed to prepare 100ml of 2.5 molal (2.5m) ammonium hydroxide solution
A)
0.056 litres done
clear
B)
0.56 litres done
clear
C)
5.6 litres done
clear
D)
11.2 litres done
clear
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question_answer42)
If the density of water is 1 g \[c{{m}^{-3}}\]then the volume occupied by one molecule of water is approximately [Pb. PMT 2004]
A)
\[18\,\,c{{m}^{3}}\] done
clear
B)
\[22400\,\,c{{m}^{3}}\] done
clear
C)
\[6.02\times {{10}^{-23}}\,\,c{{m}^{3}}\] done
clear
D)
\[3.0\times {{10}^{-23}}\,\,c{{m}^{3}}\] done
clear
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question_answer43)
Caffeine has a molecular weight of 194. If it contains 28.9% by mass of nitrogen, number of atoms of nitrogen in one molecule of caffeine is
A)
4 done
clear
B)
6 done
clear
C)
2 done
clear
D)
3 done
clear
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question_answer44)
A 400 mg iron capsule contains 100 mg of ferrous fumarate, \[{{(CHCOO)}_{2}}Fe\]. The percentage of iron pasent in it is approximately
A)
33% done
clear
B)
25% done
clear
C)
14% done
clear
D)
8% done
clear
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question_answer45)
The element whose a atom has mass of \[10.86\times {{10}^{-26}}\]kg is
A)
Boron done
clear
B)
Calcium done
clear
C)
Silver done
clear
D)
Zinc done
clear
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question_answer46)
The number of gram atoms of oxygen present in 0.3 gram mole of \[{{(COOH)}_{2}}.2{{H}_{2}}O\]is
A)
0.6 done
clear
B)
1.8 done
clear
C)
1.2 done
clear
D)
3.6 done
clear
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question_answer47)
A gaseous mixture contains \[C{{H}_{4}}\]and \[{{C}_{2}}{{H}_{6}}\]in equimolecular proportion. The weight of 2.24 litres of this mixture at NTP is
A)
4.6 g done
clear
B)
1.6 g done
clear
C)
2.3 g done
clear
D)
23 g done
clear
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question_answer48)
Vapour density of a metal chloride is 66. Its oxide contains 53% metal. The atomic weight of the metal is [Bihar MADT 1982]
A)
21 done
clear
B)
54 done
clear
C)
27.06 done
clear
D)
2.086 done
clear
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question_answer49)
One gram of hydrogen is found to combine with 80g of bromine one gram of calcium valency=2 combines with 4g of bromine the equivalent weight of calcium is
A)
10 done
clear
B)
20 done
clear
C)
40 done
clear
D)
80 done
clear
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question_answer50)
The equivalent weight of \[MnS{{O}_{4}}\]is half its molecular weight when it is converted to [IIT 1988; CPMT 1994]
A)
\[M{{n}_{2}}{{O}_{3}}\] done
clear
B)
\[Mn{{O}_{2}}\] done
clear
C)
\[Mn{{O}_{4}}\] done
clear
D)
\[MnO_{4}^{2-}\] done
clear
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question_answer51)
\[100\ mL\] of \[P{{H}_{3}}\] on decomposition produced phosphorus and hydrogen. The change in volume is [MNR 1986]
A)
\[50\ mL\] increase done
clear
B)
\[500\ mL\] decrease done
clear
C)
\[900\ mL\] decrease done
clear
D)
Nil. done
clear
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question_answer52)
\[12g\]of \[Mg\](at. mass 24) on reacting completely with acid gives hydrogen gas, the volume of which at STP would be [CPMT 1978]
A)
\[22.4\ L\] done
clear
B)
\[11.2\ L\] done
clear
C)
\[44.8\ L\] done
clear
D)
\[6.1\ L\] done
clear
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question_answer53)
Which of the following has least mass [Pb. PET 1985]
A)
\[2\ g\] atom of nitrogen done
clear
B)
\[3\times {{10}^{23}}\] atoms of \[C\] done
clear
C)
1 mole of \[S\] done
clear
D)
\[7.0\ g\] of \[Ag\] done
clear
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question_answer54)
How many mole of helium gas occupy \[22.4\ L\] at \[{{0}^{o}}C\] at 1 atm. pressure [Kurukshetra CEE 1992; CET 1992]
A)
0.11 done
clear
B)
0.90 done
clear
C)
1.0 done
clear
D)
1.11 done
clear
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question_answer55)
Volume of a gas at STP is \[1.12\times {{10}^{-7}}\]cc. Calculate the number of molecules in it [BHU 1997]
A)
\[3.01\times {{10}^{20}}\] done
clear
B)
\[3.01\times {{10}^{12}}\] done
clear
C)
\[3.01\times {{10}^{23}}\] done
clear
D)
\[3.01\times {{10}^{24}}\] done
clear
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question_answer56)
\[4.4\ g\] of an unknown gas occupies \[2.24L\] of volume at standard temperature and pressure. The gas may be [MP PMT 1995]
A)
Carbon dioxide done
clear
B)
Carbon monoxide done
clear
C)
Oxygen done
clear
D)
Sulphur dioxide done
clear
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question_answer57)
The number of moles of oxygen in \[1\ L\] of air containing 21% oxygen by volume, in standard conditions, is [CBSE PMT 1995; Pb. PMT 2004]
A)
0.186 mol done
clear
B)
0.21 mol done
clear
C)
2.10 mol done
clear
D)
0.0093 mol done
clear
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question_answer58)
The number of molecules in \[8.96\ L\] of a gas at \[{{0}^{o}}C\] and 1 atmosphere pressure is approximately [BHU 1993]
A)
\[6.02\times {{10}^{23}}\] done
clear
B)
\[12.04\times {{10}^{23}}\] done
clear
C)
\[18.06\times {{10}^{23}}\] done
clear
D)
\[24.08\times {{10}^{22}}\] done
clear
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question_answer59)
The equivalent weight of a metal is 9 and vapour density of its chloride is 59.25. The atomic weight of metal is [Pb. CET 2002]
A)
23.9 done
clear
B)
27.3 done
clear
C)
36.3 done
clear
D)
48.3 done
clear
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question_answer60)
The molecular weight of a gas is 45. Its density at STP is [Pb. PMT 2004]
A)
22.4 done
clear
B)
11.2 done
clear
C)
5.7 done
clear
D)
2.0 done
clear
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question_answer61)
Equivalent weight of a bivalent metal is 37.2. The molecular weight of its chloride is [MH CET 2003]
A)
412.2 done
clear
B)
216 done
clear
C)
145.4 done
clear
D)
108.2 done
clear
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question_answer62)
On reduction with hydrogen, 3.6 g of an oxide of metal left 3.2 g of metal. If the vapour density of metal is 32, the simplest formula of the oxide would be [DPMT 2004]
A)
\[MO\] done
clear
B)
\[{{M}_{2}}{{O}_{3}}\] done
clear
C)
\[{{M}_{2}}O\] done
clear
D)
\[{{M}_{2}}{{O}_{5}}\] done
clear
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question_answer63)
The number of molecules in 4.25 g of ammonia are [Pb. CET 2000]
A)
\[0.5\times {{10}^{23}}\] done
clear
B)
\[1.5\times {{10}^{23}}\] done
clear
C)
\[3.5\times {{10}^{23}}\] done
clear
D)
\[1.8\times {{10}^{32}}\] done
clear
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