Chemistry Solved Questions and Answers Set 4

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

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

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

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