Chemistry Solved Questions and Answers Set 3

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chemistry science solved questions and answers for civil services entrance exams important set 3 entranciology

Q.1:- Hydrolysis of cane sugar is called ?

  1. Saponification
  2. Hydration
  3. Inversion
  4. Esterification

Ans:- (c) Inversion

Q.2:- Iodine test used to detect ?

  1. Cholesterol
  2. Fat
  3. Protein
  4. Carbohydrate

Ans:- (d) Carbohydrate

Q.3:- Sulphur dioxide bleaches colouring matter by ?

  1. Decomposition
  2. Oxidation
  3. Reduction
  4. Dehydration

Ans:- (c) Reduction

Q.4:- Which element is most abundant on Earth’s crust ?

  1. Calcium
  2. Carbon
  3. Silicon
  4. Oxygen

Ans:- (d) Oxygen

Q.5:- Nuclear fission is caused by the impact of ?

  1. Neutrons
  2. Protons
  3. Deuteron
  4. Electron

Ans:- (b) Protons

Q.6:- Which type of bonding occurs in NH4Cl?

  1. Ionic
  2. Covalent
  3. Co-ordinate
  4. All

Ans:- (d) All

Q.7:- What is the oxidation number of Sulphur in SO42- ion ?

  1. -2
  2. +2
  3. +6
  4. 8

Ans:- (c) +6

Q.8:- The word ‘Insolation’ means ?

  1. Matters which insulates
  2. Incoming solar radiation
  3. Insoluble matters
  4. None of the above

Ans:- (b) Incoming solar radiation

Q.9:- Neutron was discovered by ?

  1. J.J. Thomson
  2. Chadwick
  3. Rutherford
  4. Priestley
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Ans:- (b) Chadwick

Q.10:- Electromagnetic radiation with maximum wavelength is ?

  1. Ultraviolet
  2. Radio Waves
  3. X-Rays
  4. Infrared

Ans:- (b) Radio Waves

Q.11:- In isotopes the number of neutrons are ?

  1. Same
  2. Different
  3. Both
  4. None

Ans:- (b) Different

Q.12:- The phenomenon of radioactivity was discovered in 1898 A.D. by ?

  1. Henri Bacquerel
  2. J.J. Thomson
  3. Marie Curie
  4. Pierre Curie

Ans:- (a) Henri Becquerel

Q.13:- What was the fissionable material used in the bombs dropped at Nagasaki (Japan) in the year 1945 ?

  1. Sodium
  2. Potassium
  3. Plutonium
  4. Uranium

Ans:- (c) Plutonium

Q.14:- Formation of anion occurs by ?

  1. Loss of neutrons
  2. Gain of protons
  3. Gain of electrons
  4. None

Ans:- (c) Gain of electrons

Q.15:- Formation of cation occurs by ?

  1. Gain of electrons
  2. Loss of electrons
  3. Gain of protons
  4. Loss of protons

Ans:- (b) Loss of electrons

Q.16:- Which of the following is the pure element ?

  1. Glass
  2. Cement
  3. Sodium
  4. None of these
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Ans:- (c) Sodium

Q.17:- Who among the following proposed that atom is indivisible ?

  1. Dalton
  2. Berzelius
  3. Rutherford
  4. Avogadro

Ans:- (a) Dalton

Q.18:- During electrolysis the reaction at anode is ?

  1. Oxidation
  2. Reduction
  3. Decomposition
  4. None of these

Ans:- (a) Oxidation

Q.19:- When Iron is rusted, it is ?

  1. Oxidised
  2. Reduced
  3. Evaporated
  4. Decomposed

Ans:- (a) Oxidised

Q.20:- Rate of diffusion of a gas is ?

  1. Directly proportional to its density
  2. Directly proportional to its molecular mass
  3. Directly proportional to the square of its molecular mass
  4. Inversely proportional to the square root of its molecular mass

Ans:- (d) Inversely proportional to the square root of its molecular mass

Q.21:- The pH of lemon juice is expected to be ?

  1. Less than 7
  2. More than 7
  3. Equal to 7
  4. Nothing can be predicted

Ans:- (a) Less than 7

Q.22:- Which of the following is an extensive property of the system ? (Thermodynamics and Energetics)

  1. Temperature
  2. Volume
  3. Refractive Index
  4. Viscosity
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Ans:- (b) Volume

Q.23:- Which of the following has zero electron affinity ?

  1. Nitrogen
  2. Oxygen
  3. Fluorine
  4. Neon

Ans:- (d) Neon

Q.24:- The most common lanthanide is ?

  1. Lanthanum
  2. Cerium
  3. Plutonium
  4. Samarium

Ans:- (b) Cerium

Q.25:- Electron affinity of noble gases is ?

  1. Almost Zero
  2. Low
  3. High
  4. Very High

Ans:- (a) Almost Zero