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question_answer1)
The early attempt to classify elements as metals and non-metals was made by
A)
Mendeleev done
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B)
Lother Meyer done
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C)
Lavoisier done
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D)
Henry Moseley done
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question_answer2)
The long form of periodic table consists of
A)
seven periods and eight groups done
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B)
seven periods and eighteen groups done
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C)
eight periods and eighteen groups done
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D)
eighteen periods and eight groups done
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question_answer3)
Which one of the following is most electropositive element?
A)
Sodium done
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B)
Calcium done
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C)
Aluminium done
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D)
Silicon done
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question_answer4)
Which of the following is not isoelectronic with \[{{O}^{2-}}\]?
A)
\[{{N}^{3-}}\] done
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B)
\[N{{a}^{+}}\] done
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C)
\[{{F}^{-}}\] done
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D)
\[T{{i}^{+}}\] done
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question_answer5)
On the basis of following features identify correct option
A. Gaps were left for undiscovered elements |
B. No correct position of hydrogen |
C. The isotopes of same element will be given different position |
A)
Mendeleev's periodic table done
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B)
Modem periodic table done
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C)
Newland's arrangement of elements done
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D)
Both [a] and [b] done
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question_answer6)
According to Newland's law of octaves, which element is the repetition of the first element in the periodic table?
A)
Oxygen done
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B)
Nitrogen done
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C)
Chlorine done
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D)
Sulphur done
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question_answer7)
Which one of the following is a diagonally related pair?
A)
H, Be done
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B)
Na, Mg done
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C)
B, Si done
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D)
K, Ca done
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question_answer8)
Which element is more electronegative among halogens?
A)
Br done
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B)
CI done
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C)
F done
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D)
I done
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question_answer9)
Which of the following is correct set of Dobereiner Triads?
A)
Na, Si, CI done
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B)
Be, Mg, Ca done
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C)
F, CI, I done
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D)
Li, Na, Be done
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question_answer10)
On moving horizontally across a period, the number of electrons in the outermost shell increases from ...... to.......
A)
2, 8 done
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B)
2, 18 done
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C)
1, 8 done
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D)
1, 18 done
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question_answer11)
Which of the following elements A, B, C, D and E with atomic number 3, 11, 15, 18 and 19 respectively belong to the same group?
A)
A, B, C done
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B)
B, C, D done
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C)
A, D, E done
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D)
A, B, E done
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question_answer12)
Which of the following statement is not true about noble gases?
A)
They are non-metallic in nature done
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B)
They exist in atomic form done
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C)
They are radioactive in nature done
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D)
Xenon is the most reactive among them done
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question_answer13)
Which among the following atoms has high atomic radi?
A)
Na done
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B)
Rb done
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C)
K done
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D)
Cs done
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question_answer14)
Which of the following is an actinide?
A)
Plutonium done
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B)
Polonium done
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C)
Promethium done
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D)
Palladium done
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question_answer15)
Which one of these group of elements is also called the halogen family?
A)
Group 16 done
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B)
Group 18 done
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C)
Group 10 done
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D)
Group 17 done
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question_answer16)
The elements with atomic numbers 2, 10, 18, 36, 54 and 86 are all -
A)
halogens done
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B)
noble gases done
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C)
noble metals done
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D)
light metals done
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question_answer17)
Which one of the following properties changes with valency? [CDS]
A)
Atomic weight done
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B)
Equivalent weight done
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C)
Molecular weight done
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D)
Density done
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question_answer18)
The elements of a group in the periodic tabic [CDS]
A)
have similar chemical properties done
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B)
have consecutive atomic numbers done
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C)
are isobars done
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D)
are isotopes done
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question_answer19)
Which element forms the highest number of compounds in the periodic table? [CDS]
A)
Carbon done
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B)
Oxygen done
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C)
Silicon done
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D)
Sulphur done
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question_answer20)
Which one of the following is not a periodic property i.e., does not show any trend on moving from one side to the other in the periodic table? [CDS]
A)
Atomic size done
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B)
Valency done
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C)
Radioactivity done
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D)
Electronegativity done
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question_answer21)
Which one of the following elements is a metalloid? [NDA]
A)
P done
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B)
Al done
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C)
As done
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D)
Po done
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question_answer22)
What is the correct increasing order of electronegativity for the most common oxidation states among the following elements? [NDA]
A)
F<O<N<C done
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B)
C<N<C<F done
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C)
C<N<F<O done
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D)
C<N<O<F done
clear
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question_answer23)
Consider the following statements with reference to the periodic table of chemical elements: [IAS Prelim]
1. Ionisation potential gradually decreases along a period |
2. In a group of elements, electron affinity decreases as the atomic weight increases |
3. In a given period, electronegativity decreases as the atomic number increases |
Which of these statement (s) is/are correct?
A)
1 only done
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B)
2 only done
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C)
1 and 3 done
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D)
2 and 3 done
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question_answer24)
The octet rule is not valid for which one of the following molecules? [NDA]
A)
\[C{{O}_{2}}\] done
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B)
\[{{H}_{2}}S\] done
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C)
\[N{{H}_{3}}\] done
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D)
\[B{{F}_{3}}\] done
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question_answer25)
The rusting of iron nail [CDS]
A)
decreases its weight done
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B)
increases its weight done
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C)
does not affect weight but iron is oxidised done
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D)
does not affect weight but iron is reduced done
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question_answer26)
Which one of the following when dissolved in \[{{H}_{2}}O\] gives hissing sound? [CDS]
A)
Limestone done
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B)
Slaked lime done
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C)
Soda lime done
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D)
Quicklime done
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question_answer27)
Consider the following statements: [NDA]
1. Maximum covalency of carbon is 4, whereas maximum covalency of silicon is 6.
|
2. The maximum covalency of an element is limited to 6.
|
Which of the statements given above is/are correct?
|
A)
1 only done
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B)
2 only done
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C)
Both 1 and 2 done
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D)
Neither 1 nor 2 done
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question_answer28)
An ionic compound when dissolved in water has produced \[m\,{{A}^{n-}},n\,{{B}^{m-}}\] ions. What is the formula of the compound? [NDA]
A)
\[{{A}_{m}}{{B}_{n}}\] done
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B)
\[{{A}_{n}}{{B}_{m}}\] done
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C)
\[{{A}_{m}}{{B}_{m}}\] done
clear
D)
\[{{A}_{n}}{{B}_{n}}\] done
clear
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question_answer29)
What are the types of bonds present in\[CuS{{O}_{4}}.5{{H}_{2}}O\]? [NDA]
A)
Electrovalent and covalent done
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B)
Electrovalent and coordinate covalent done
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C)
Electrovalent, covalent, coordinate covalent and hydrogen bonds done
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D)
Covalent and coordinate covalent done
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question_answer30)
Consider the following equation for the formation of ammonia from nitrogen and hydrogen: [NDA]
\[{{N}_{2}}+3{{H}_{2}}=2N{{H}_{3}}\]
|
How many hydrogen molecules are required to react with 100 molecules of nitrogen?
|
A)
100 done
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B)
200 done
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C)
300 done
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D)
400 done
clear
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question_answer31)
As compared to covalent compounds, electro valent compounds, generally have [NDA]
A)
low melting point and low boiling point done
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B)
low melting point and high boiling point done
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C)
high melting point and low boiling point done
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D)
high melting point and high boiling point done
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question_answer32)
Calcium carbonate is naturally available as limestone and can also be synthesized from quick lime. It is seen that the compositions of the elements in both the natural and synthetic calcium carbonate are same. The validity of which one among the following laws is confirmed by this observation? [NDA]
A)
Law of conservation of mass done
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B)
Law of definite proportion done
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C)
Law of multiple proportion done
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D)
Avogadro?s law done
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question_answer33)
This question consist of two statements, Statement I and Statement II. You are to examine these two statements carefully and select the answer to these items using the codes given below. [NDA]
Statement I: Conversion of blue copper sulphate to black cupric oxide on heating is a physical change. |
Statement II: A change in which chemical composition does not change is called physical change. |
A)
Both the statements individually true and Statement II is the correct explanation of Statement I. done
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B)
Both the statements are individually true but Statement II is not correct explanation of Statement I. done
clear
C)
Statement I is true but Statement II is false. done
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D)
Statement I is false but Statement II is true. done
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question_answer34)
In \[KMn{{O}_{4}}\]molecule, the oxidation states of the elements Potassium (K), Manganese (Mn) and Oxygen (O) are respectively [NDA]
A)
+1, + 5, - 2 done
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B)
+1, + 7, - 2 done
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C)
0, 0, 0 done
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D)
+1, + 7, 0 done
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question_answer35)
In the reaction \[4Fe+3{{O}_{2}}\to 4F{{e}^{3+}}+6{{O}^{2-}}\] [NDA] |
Which of the following statements is incorrect? |
A)
It is a redox reaction done
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B)
Metallic iron acts as a reducing agent done
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C)
\[{{O}_{2}}\]acts as an oxidising agent done
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D)
Metallic iron is reduced to \[F{{e}^{3+}}\] done
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question_answer36)
Most of the explosions in mines occur due to the mixing of [IAS Prelim]
A)
hydrogen with oxygen done
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B)
oxygen with acetylene done
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C)
methane with air done
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D)
carbon dioxide with ethane done
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question_answer37)
Match List-I (Oxidation number) with List II (The element) and select the correct answer using the codes given below the lists : [IAS Prelim]
List-I (Oxidation number) |
List-II (The elements) |
A. 2 Mn in \[Mn{{O}_{2}}\] |
1. Oxidation number of |
B. 3 S in \[{{H}_{2}}{{S}_{2}}{{O}_{7}}\] |
2. Oxidation number of |
C. 4 Ca in CaO |
3. Oxidation number of |
D. 6 AI in \[NaAI{{H}_{4}}\] |
4. Oxidation number of |
A)
A-3; B-4; C-1; D-2 done
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B)
A-4; B-3; C-1; D-2 done
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C)
A-3; B-4; C-2; D-1 done
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D)
A-4; B-3; C-2; D-1 done
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question_answer38)
If a limestone piece is dipped in water, a bubble evolves. The bubbling is due to [CDS]
A)
hydrogen done
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B)
oxygen done
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C)
water vapour done
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D)
carbon dioxide done
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question_answer39)
Which one of the following reducing agents can also act as an oxidising agent? [CDS]
A)
\[{{H}_{2}}\] done
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B)
\[{{H}_{2}}S\] done
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C)
\[S{{O}_{2}}\] done
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D)
HI done
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question_answer40)
A woman desires to clean the surface of her gold ornaments by a chemical approach. For this she requires to use [CDS]
A)
aqua-regia done
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B)
concentrated \[{{H}_{2}}S{{O}_{4}}\] done
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C)
concentrated NaOH done
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D)
sodium thiosulphate solution done
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