Chemistry · NDA previous year questions

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2021 28 questions

Q522021 · 14 Nov 2021
The pH value of Milk of Magnesia is approximately
1. A.zero
2. B.7
3. C.10
4. D.14
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Answer: C
Q532021 · 14 Nov 2021
MCQ (More than One Correct Answer) Which one of the following compounds is used in ‘black and white’ photography ?
1. A. $AgF$
2. B. $AgBr$
3. C. $AgCl$
4. D. $A g_{2} S O_{4}$
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Answer: B, C
Q542021 · 14 Nov 2021
What is the number of water molecules present in a Ferrous Sulphate crystal ?
1. A.1
2. B.3
3. C.5
4. D.7
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Answer: D
Q552021 · 14 Nov 2021
What is the colour of the precipitate obtained by passing $C O_{2}$ gas through lime water ?
1. A.Green
2. B.Blue
3. C.White
4. D.Brown
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Answer: C
Q562021 · 14 Nov 2021
Which one of the following pairs of elements is liquid at room temperature and at normal pressure ?
1. A.Gallium and Bromine
2. B.Mercury and Bromine
3. C.Gallium and Mercury
4. D.Gallium and Caesium
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Answer: B
Q572021 · 14 Nov 2021
Which one of the following methods can be used to separate anthracene from a mixture of salt and anthracene ?
1. A.Distillation
2. B.Sublimation
3. C.Evaporation
4. D.Chromatography
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Answer: B
Q712021 · 14 Nov 2021
Rutherford’s alpha-particle (α) scattering experiment was responsible for the discovery of which one of the following?
1. A.Electron
2. B.Proton
3. C.Atomic Nucleus
4. D.Neutron
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Answer: C
Q722021 · 14 Nov 2021
What is the maximum number of electrons in the M-Shell ?
1. A.6
2. B.8
3. C.18
4. D.32
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Answer: C
Q732021 · 14 Nov 2021
Chlorine occurs in nature in two isotopic forms of masses 35 u and 37 u in the ratio of 3 ∶ 1 respectively. What is the average atomic mass of the Chlorine atom ?
1. A.36.1 u
2. B.35.5 u
3. C.36.5 u
4. D.35.1 u
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Answer: B
Q742021 · 14 Nov 2021
Which one of the following elements’ isotopes is used in the treatment of cancer ?
1. A.Iodine
2. B.Sodium
3. C.Cobalt
4. D.Uranium
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Answer: C
Q752021 · 14 Nov 2021
To protect steel and iron from rusting, a thin layer of which one of the following metals is applied ?
1. A.Magnesium
2. B.Zinc
3. C.Aluminium
4. D.Lead
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Answer: B
Q932021 · 14 Nov 2021
Which one of the following ions is not iso-electronic with $F^{-}$ ?
1. A. $O^{2 -}$
2. B. $N a^{+}$
3. C. $Ne$
4. D. $N^{-}$
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Answer: D
Q952021 · 14 Nov 2021
Which one of the following is the chemical formula of Plaster of Paris ?
1. A. $CaS O_{4} \cdot \frac{1}{2} H_{2} O$
2. B. $CaS O_{4} \cdot 2 H_{2} O$
3. C. $CaS O_{4} \cdot 5 H_{2} O$
4. D. $CaS O_{4} \cdot 4 H_{2} O$
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Answer: A
Q552021 · 18 Apr 2021
Common salt (NaCl) is not used as a raw material for preparation of which one of the following compounds?
1. A.Bleaching powder
2. B.Baking soda
3. C.Plaster of Paris
4. D.Washing soda
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Answer: C
Q622021 · 18 Apr 2021
Which one of the following is the chemical formula of Hypobromous acid?
1. A. $HBr O_{4}$
2. B. $HOBr$
3. C. $HBr$
4. D. $HBr O_{3}$
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Answer: B
Q632021 · 18 Apr 2021
The composition of gases in exosphere is
1. A.Helium and Hydrogen.
2. B.Neon and Oxygen.
3. C.Neon and Hydrogen.
4. D.Helium and Neon.
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Answer: A
Q652021 · 18 Apr 2021
In electrolytic refining of copper, the electrolyte is a solution of
1. A.Acidified copper chloride.
2. B.Acidified copper sulphate.
3. C.Potassium chloride.
4. D.Sodium sulphate.
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Answer: B
Q672021 · 18 Apr 2021
Which one of the following statements about dihydrogen ( $H_{2}$ ) is not correct?
1. A. $H_{2}$ is lighter than air and insoluble in water.
2. B. $H_{2}$ is inert at room temperature due to high $H - H$ bond dissociation enthalpy.
3. C. $H_{2}$ reacts with alkali metals at high temperature to yield metal hydrides.
4. D.A mixture of $N O_{2}$ and $H_{2}$ is known as Syngas.
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Answer: D
Q682021 · 18 Apr 2021
Which of the following sets of elements has the same valency?
1. A.Na, Mg, Ca
2. B.Na, Mg, Al
3. C.Mg, Ca, K
4. D.Mg, Ca, Ba
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Answer: D
Q722021 · 18 Apr 2021
The process whereby certain minerals absorb water, expand and change is called as
1. A.Hydration
2. B.Oxidation
3. C.Hydrolysis
4. D.Carbonation
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Answer: A
Q752021 · 18 Apr 2021
Hydrogenation of vegetable oils using nickel catalyst is an example of
1. A.Substitution reaction
2. B.Elimination reaction
3. C.Addition reaction
4. D.Free-radical polymerization
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Answer: C
Q762021 · 18 Apr 2021
Which one of the following materials is not an allotrope of carbon ?
1. A.Diamond
2. B.Graphene
3. C.Fly ash
4. D.Fullerene
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Answer: C
Q772021 · 18 Apr 2021
Which one of the following reactions does not result in the evolution of hydrogen gas?
1. A.Reaction of zinc metal with dilute sulphuric acid solution
2. B.Mixing water to Plaster of Paris
3. C.Heating zinc metal with sodium hydroxide solution
4. D.Reaction of potassium metal with water
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Answer: B
Q782021 · 18 Apr 2021
Which one of the following acids is predominantly found in tomatoes?
1. A.Acetic acid
2. B.Tartaric acid
3. C.Oxalic acid
4. D.Lactic acid
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Answer: C
Q792021 · 18 Apr 2021
Which one of the following conclusions could not be derived from Rutherford's α-particle scattering experiment?
1. A.Most of the space in the atom is empty
2. B.The radius of the atom is about $1 0^{5}$ times the radius of the nucleus
3. C.Electrons move in a circular path of fixed energy called orbits
4. D.Nearly all the mass of the atom resides in the nucleus
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Answer: C