Chemistry Solved Questions and Answers Set 2

Q.1:- Which of the following is an element ?

1. Alumina
2. Brass
3. Graphite
4. Silicon

Ans:- (d) Silicon

Q.2:- The radius of an atomic nucleus is of the order of ?

1. 10^-10 cm
2. 10^-13 cm
3. 10^-15 cm
4. 10^-8 cm

Ans:- (b) 10^-13 cm

Q.3:- Discovery of the nucleus of an atom was due to the experiment carried out by ?

1. Bohr
2. Rutherford
3. Moseley
4. Thomson

Ans:- (b) Rutherford

Q.4:- Isobars are lines displaying areas of equal ?

1. Humidity
2. Temperature
3. Rainfall
4. Atmospheric Pressure

Ans:- (d) Atmospheric Pressure

Q.5:- The atoms of the elements having the same mass number but different atomic number are called ?

1. Isotopes
2. Isobars
3. Isotones
4. Isomers

Ans:- (b) Isobars

Q.6:- Which of the properties of the element is a whole number ?

1. Atomic Mass
2. Atomic Number
3. Atomic Radius
4. Atomic Volume

Ans:- (b) Atomic Number

Q.7:- ‘Misch Metal’ is widely used in manufacture of which of the following ?

1. Material of car brake
2. Smoke detectors
3. Cigarette lighters
4. Emergency lights

Ans:- (c) Cigarette lighters

Q.8:- Which one of the following is not a mixture ?

1. Air
2. Mercury
3. Milk
4. Cement

Ans:- (b) Mercury

Q.9:- Nucleons are ?

1. Protons and Neutrons
2. Neutrons and Electrons
3. Protons and Electrons
4. Protons, Neutrons and Electrons

Ans:- (a) Protons and Neutrons

Q.10:- The maximum number of electrons on a principal shell is ?

1. n²
2. n
3. 2n²
4. 3n²

Ans:- (c) 2n²

Q.11:- Cathode rays are ?

1. Electromagnetic Wave
2. Stream of Alpha-Particles
3. Stream of electrons
4. Radiations

Ans:- (c) Stream of electrons

Q.12:- A colloid solution of a liquid, in a solid is termed as ?

1. Aerosol
2. Gel
3. Emulsion
4. Sol

Ans:- (b) Gel

Q.13:- Which of the following colloids are solvent hating colloids ?

1. Lyophilic
2. Lyophobic
3. Hydrophilic
4. None of these

Ans:- (b) Lyophobic

Q.14:- Brass contains ?

1. Copper and Zinc
2. Copper and Tin
3. Copper and Silver
4. Copper and Nickel

Ans:- (a)  Copper and Zinc

Q.15:- The sky looks blue due to ?

1. Dispersion effect
2. Scattering
3. Reflection
4. Transmission

Ans:- (b) Scattering

Q.16:- Medicines are more effective, if they are used in ?

1. Solution State
2. Gaseous State
3. Colloidal State
4. Solid State

Ans:- (c) Colloidal State

Q.17:- Which one of the following elements is used as common catalyst ?

1. B
2. Ge
3. Ni
4. Ga

Ans:- (c) Ni

Q.18:- Heavy water is used as ?

1. Washing water
2. Detergent
3. Drinking water
4. Moderator

Ans:- (d) Moderator

Q.19:- Which one of the following is used in making pencils ?

1. Charcoal
2. Bone Black
3. Black Ash
4. Graphite

Ans:- (d) Graphite

Q.20:- The colour of hydrogen is ?

1. Yellow
2. Orange
3. Black
4. Colourless

Ans:- (d) Colourless

Q.21:- Chemically phosgene gas is ?

1. Carbonyl Sulphide
2. Carbonyl Chloride
3. Phosphine
4. Nickel Carbonyl

Ans:- (b) Carbonyl Chloride

Q.22:- Use of diamond as a gem depends upon its ?

1. High Cost
2. Refraction Index
3. Extreme Hardness
4. Bad Conductance

Ans:- (b) Refraction Index

Q.23:- Dry Powder extinguisher contains ?

1. Sand
2. Sand and Baking Soda
3. Sand and Na₂CO₃
4. Sand and K₂CO₃

Ans:- (b) Sand and Baking Soda

Q.24:- Which of the following cannot be used as nitrogenous fertilizer ?

1. CaNCN
2. NH₄NO₃
3. HNO₃
4. NH₂CONH₂

Ans:- (c) HNO₃

Q.25:- The gas is commonly used in anaesthesia ?

1. Methane
2. Nitrous Oxide
3. Nitrogen
4. Hydrogen Peroxide

Ans:- (b) Nitrous Oxide