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Chemistry Questions Answers

Q31 :

In which period of the periodic table is a chemical element with atomic number 20 placed?

A
  

2

B
  

3

C
  

4

D
  

5

View Answer
Correct Answer: C

4

No Description Available
Q32 :

Chloroform is slowly oxidised by air in the presence of light to form —

A
  

Formic acid

B
  

Formyl chloride

C
  

Phosgene

D
  

Trichloroacetic acid

View Answer
Correct Answer: C

Phosgene

No Description Available
Q33 :

Consider the following statements:
1. By increasing the external pressure, a liquid can be made to boil at higher temperature than its boiling point
2. Benzene and water are immiscible liquids
3. The solubility of a gas in liquid increases as the temperature of the solvent is increased
Which of these statements are correct?

A
  

1 and 2

B
  

2 and 3

C
  

1 and 3

D
  

1, 2 and 3

View Answer
Correct Answer: D

1, 2 and 3

No Description Available
Q34 :

Aldol condensation cannot occur between —

A
  

two different aldehydes

B
  

two different ketones

C
  

an aldehydes and a ketone

D
  

an aldehydes and an ester

View Answer
Correct Answer: D

an aldehydes and an ester

No Description Available
Q35 :

In which one of the industries is pure silicon used?

A
  

Electronics

B
  

Paint

C
  

Pharmaceutical

D
  

Textile

View Answer
Correct Answer: A

Electronics

No Description Available
Q36 :

Match List I with List II and select the correct answer using the codes given below the Lists:

List I (Substances)
(a) Zeolite
(b) Sodium thiosulphate
(c) Magnesium sulphate
(d) Graphite

List II (Use)
1. Purgative
2. Safety matches
3. Dry Cell
4. Purification of water
5. Photography

A
  

a-3, b-5, c-2, d-4

B
  

a-4, b-1, c-2, d-3

C
  

a-3, b-2, c-1, d-5

D
  

a-4, b-5, c-1, d-3

View Answer
Correct Answer: D

a-4, b-5, c-1, d-3

No Description Available
Q37 :

Which one of the following systems has maximum entropy?

A
  

One mole of water vapour

B
  

One mole of liquid water

C
  

One mole of solid water

D
  

One mole of water at triple point

View Answer
Correct Answer: A

One mole of water vapour

No Description Available
Q38 :

Who among the following does not have a chemical element named after him?

A
  

Albert Einstein

B
  

Enrico Fermi

C
  

Isaac Newton

D
  

Dmitri Mendeleev

View Answer
Correct Answer: C

Isaac Newton

No Description Available
Q39 :

Which one of the following is used in welding industry?

A
  

Methane

B
  

Ethane

C
  

Acetylene

D
  

Benzene

View Answer
Correct Answer: C

Acetylene

No Description Available
Q40 :

The most likely pH of an aqueous solution of sodium salt of ethyl alcohol is

A
  

3

B
  

5

C
  

7

D
  

9

View Answer
Correct Answer: C

7

No Description Available
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