Chemistry Based questions in Civil Services Exams

 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)

DETERGENTS AND SOAPS

1. Consider the following statements: (2003)

The purpose of adding sodium sulphate and sodium silicate to the detergent in a washing powder is 

1. To keep the washing powder dry

2. To maintain the alkalinity of the powder Ans : a

2. Synthetic detergents can leather well in which water?

Ans : Well water (2002)

ACIDS AND BASES

1. An aqueous solution of copper sulphate is acidic in nature because the salt undergoes

1. Dialysis    b) electrolysis   c) hydrolysis   d) photolysis     (2001)

Ans: c

2. When ants bite, they inject

1. Glacial acetic acid   b) methanol    c) formic acid      d) stearic acid           ( 1999)

Ans: c

3. Glass can be etched or scratched by

1. Diamond    b) hydrofluoric acid   c) aquaregia  d) conc.sulpuric acid          (1999)

   Ans: diamond used for cutting  and hydrofluoric acid for writing on the glass

4. To dilute sulphuric acid, ____ is added to the water and not water to acid        ( 1999)

          Ans:    acid 

5. Formic acid is a _______ acid than  acetic  acid (1999)

Ans: stronger

6. Acid precipitation is now regarded as a serious problem in some European            (1998)

and Asian countries. Its major cause or source is

1. Discharge of acidic effluents onto neutral or slightly alkaline land where the acidic components precipitate

2. Emissions of sulphur oxides and nitrogen oxides from thermal powder plants and burning of fossile fuels; these oxides dissolve in atmospheric water vapour and fall back on earth as acid rain

3. Naural carbondioxide released during respiration of living oranisms dissolves in water, forming carbonic acid which is the chief contributor to acidity in rain water

4. Chlorofluorocarbons readily react with various chemicals near the earth’s surface, producing acidic intermediates which cause acid precipitation                Ans¨(b)

7. Vinegar is an aquerous solution of ( 1993)

1. Oxalic acid   b) citric acid    c) acetic acid    d) hydrochloric acid          Ans: c

INDUSTRIAL CHEMISTRY

1)Coal based thermal power stations contribute to acid rain because  ______ are emitted when coal burns.

a) oxides of carbon Ans: a ( 2003)

2)Most of the explosions in mines occur, due to the mixing of ( 2000)

a) hydrogen with oxygen    b) oxygen with acetylene   c) methane with air  

d) carbon dioxide with ethane Ans: c

3)Phenyl is used as a household  ________ (1998)

 a) germicide Ans: a

METALLURGY

1. Match the following :

(2000)

  Industrial Process Industry with which associated

1. Cracking 1. Rubber

2. Smelting 2. Petroleum

3. Hydrogenation 3. Copper

4. Vulcanization 4. Edible Fats

Ans:  A:2,       B:3,      C:4,      D:1 

2. Consider the following statements:       (1998)

Coke is one of the materials of the charge added to blast furnace for the production of steel/iron. Its function is to 

1. Act as the reducing agent

2. Remove silica associated with the iron ore

3. Function as fuel, to supply heat

4. Act as an oxidizing agent

Of these statements which are correct:

1. 1 and 2    b)   2 and 4    c) 1 and 3    d)  3 and 4 Ans : c