Chemistry Solved Questions and Answers Set 4

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Q.1:- The heaviest element known up till January, 2015 has the atomic number ?

  1. 117
  2. 118
  3. 119
  4. 120

Ans:- (b) 118

Q.2:- Which of the following transition metal is in liquid state ?

  1. Chromium
  2. Cadmium
  3. Mercury
  4. Vanadium

Ans:- (c) Mercury

Q.3:- Oxygen discovered by ?

  1. Priestley
  2. Boyle
  3. Scheele
  4. Cavendish

Ans:- (a) Priestley

Q.4:- Chlorine acts as a bleaching agent only in the presence of ?

  1. Dry Air
  2. Moisture
  3. Sunlight
  4. Pure Oxygen

Ans:- (b) Moisture

Q.5:- The most abundant metal in earth crust is ?

  1. Iron
  2. Magnesium
  3. Calcium
  4. Aluminium

Ans:- (d) Aluminium

Q.6:- The most abundant element is ?

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

Ans:- (c) Nitrogen

Q.7:- In an atom the order of filling up of the orbitals is governed by ?

  1. Aufbau Principle
  2. Heisenberg’s uncertainty principle
  3. Hund’s rule
  4. Pauli’s exclusion principle

Ans:- (a) Aufbau principle

Q.8:- Which of the following has highest frequency ?

  1. Cosmic rays
  2. X-Rays
  3. Radio waves
  4. Micro waves
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Ans:- (a) Cosmic rays

Q.9:- With reference to ionic compounds, consider the following statement :

  1. Ionic compounds are insoluble in alcohol
  2. Ionic compounds in the solid state are good conductor of electricity

Which of these statements is / are correct ?

  1. Only 1
  2. Only 2
  3. Both 1 and 2
  4. Neither 1 nor 2

Ans:- (a) Only 1

Q.10:- pH value of acidic solution is ?

  1. <7
  2. >7
  3. 7
  4. None

Ans:- (a) <7

Q.11:- A solution of washing soda in water is ?

  1. Acidic
  2. Neutral
  3. Bleaching
  4. Alkaline

Ans:- (d) Alkaline

Q.12:- Which has maximum calorific value ?

  1. Fat
  2. Protein
  3. Carbohydrate
  4. Amino Acid

Ans:- (a) Fat

Q.13:- Which has the highest electron affinity ?

  1. F
  2. Cl
  3. Br
  4. I

Ans:- (b) Cl

Q.14:- Isotonic solutions have the same ?

  1. Density
  2. Molar concentration
  3. Normality
  4. Strength

Ans:- (b) Molar concentration

Q.15:- Pure water does not conduct electricity because it is ?

  1. Almost not ionised
  2. Low boiling
  3. Neutral
  4. Readily decomposed

Ans:- (a) Almost not ionised

Q.16:- A non-electronic conductor is ?

  1. Iron
  2. Gas Carbon
  3. Copper Sulphate
  4. Mercury
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Ans:- (c) Copper Sulphate

Q.17:- The chemical used as a ‘fixer’ in photography is ?

  1. Sodium sulphate
  2. Sodium thiosulphate
  3. Ammonium persulphate
  4. Borax

Ans:- (b) Sodium thiosulphate

Q.18:- The Hydrogen atoms present in acetylene molecule are ?

  1. Acidic
  2. Basic
  3. Both acidic and basic
  4. Neutral

Ans:- (a) Acidic

Q.19:- Most of the Hydrocarbons from petroleum are obtained by ?

  1. Pyrolysis
  2. Fractional crystallisation
  3. Cracking
  4. Fractional distillation

Ans:- (d) Fractional distillation

Q.20:- One of the best solutions to get rid of non-biodegradable wastes is ?

  1. Recycling
  2. Dumping
  3. Burying
  4. Burning

Ans:- (a) Recycling

Q.21:- The most important energy carrier in the living cell is ?

  1. AMP
  2. ADP
  3. UDP
  4. ATP

Ans:- (d) ATP

Q.22:- Which of the following is responsible for permanent hardness of water ?

  1. Magnesium Bicarbonate
  2. Sodium Chloride
  3. Calcium Sulphate
  4. Calcium Bicarbonate

Ans:- (c) Calcium Sulphate

Q.23:- Smoke is an example ?

  1. Gas dispersed in liquid
  2. Gas dispersed in solid
  3. Solid dispersed in gas
  4. Liquid dispersed in solid
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Ans:- (c) Solid dispersed in gas

Q.24:- Tritium is an isotope of ?

  1. Oxygen
  2. Hydrogen
  3. Phosphorus
  4. Nitrogen

Ans:- (b) Hydrogen

Q.25:- Enzyme catalysis is an example of ?

  1. Auto Catalysts
  2. Heterogeneous Catalysts
  3. Homogeneous Catalysts
  4. Induced Catalysts

Ans:- (b) Heterogeneous Catalysts