Chemistry based questions (Chemical Bonding, Types of Chemical Solutions,Inorganic Chemistry,Electro Chemistry ) for Civil Services Exam

 CHEMICAL BONDING

1)With reference to ionic compounds, consider the following statements:  (2003)

i) Ionic compounds are insoluble in alcohol

ii) Ionic compounds in the solid state are good conductors of electricity

Which of these statements is/are correct?

1. Only I      b) Only ii

3. Both I and ii     d) Neither I nor ii          Ans : only i

2) Which one of the following is paramagnetic in nature ?  (1997)

a) Iron   b) Hydrogen   c) Oxygen    d) Nitrogen Ans: Oxygen

3) The basic reason for the extraordinary sparkle of a suitably cut diamond is that(1994) 

a) It has a very high transparency

b) It has a very high refractive index

c) It is very hard

d) It has well-defined cleavage planes  Ans: (b)

TYPES OF CHEMICAL SOLUTIONS

1)Which one of the following statements is not correct?   (2002)

a) The boiling point of an aqueous solution is higher than that of pure water

b) Addition of solutes to a solution causes an increase in its water potential

c) The vapour pressure of the water in a solution is lower than that of pure water

d) When a solution is separated from water by a semipermeable membrane, water movement can be prevented by applying pressure to the solution Ans : (b)

2) Soft drinks such as colas contain significant quantities of   (2002, 2000)

a) Caffeine    b) Nicotine   c) Tannin    d) Resin Ans : (d) 

3) Consider the following statements:      (2000)

Hard water is not suitable for

1. Drinking           2) Washing clothes with soap

3)Use of boilers     4) Irrigating crops

Which of these statements are correct?    

1.  1 and 3       b) 2 and 3

c)1,2 and 4      d) 1,2,3 and 4 Ans: (d)

4) Water is a good solvent of ionic salts because   (1994)

a) It has a high boilng point 

b) It has a high dipole m ovment

c) It has a high specific heat

d) It has no colour Ans : (b

5) Which one of the following colloidal systems is represented by fog?    (1993)

a) liquid in gas

b) Gas in liquid

c) solid in gas

d) Liquid in liquid Ans: (b)

INORGANIC CHEMISTRY

1. Which one of the following materials is very hard and very ductile? (2000)

1. Carborundum   b) Tungsten  c) Cast Iron   d) Nichrome

Ans: (d)

2. A: Sodium metal is stored under kerosene

R: Metallic sodium melts when exposed to air Ans:  ( c ) (1998)

Explanation: When sodium is kept in air, it burns to form Na2  O  and Na2  O 2

3. Consider the following statements about acetylene (1998)

1. It is used in welding industry

2. It is raw material for preparing plastics

3. It is easily obtained by mixing silicon carbide and water

Of these statements:

1. 1 and 2 are correct    b) 1 and 3 are correct

c)2 and 3 are correct    d) 1,2 and 3 are correct           Ans: (b)

4) Which one of the following elements is allowed with iron to produce steel which         (1996) 

can resist high temperatures and also have high hardness and abrasion ‘resistance?

1. Aluminium   b) Chronium  c) Nickel   d) Tungsten         Ans: (b)

5)Monozite is an ore of (1994)

a) Zirconium    b) Thorium   c) Titanium   d) Iron                        Ans : (b)

6) Galvanised iron sheets are protected from rusting due to the presence of a layer of       (1994)

the presence of a  layer of

1. Lead     b) Chronium   c) Zirconium  d) Tin             Ans (c ) 

7) Quartzite is metamorphosed from (1994)

a) Limestone   b) Obsidian     c) Sandstone     d) Shale          Ans : ( c ) 

ELECTRO CHEMISTRY

1. Aluminium  surface are often ‘anodized’ . This means the deposition of a layer of     (2000)

1. Chromium oxide    b)Aluminium oxide  c) Nickel oxide    d) Zinc oxide        Ans: (b)

2. Which one of the following metals does not form amalgams ?     (1998)

1. Zinc   b) Copper   c) Magnesium  d) Iron                    Ans: (b)

3. Which one of the following pairs of materials serves as electrodes in chargeable batteries commonly used in devices such as torchlight, electric shavers etc?   ( 1995) 

1. Nickel and cadmium  b) zinc and carbon  c) lead peroxide and lead   d) iron and cadmium  Ans:(a)