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Chemistry Questions Answers
In which period of the periodic table is a chemical element with atomic number 20 placed?
2
3
4
5
4
Chloroform is slowly oxidised by air in the presence of light to form —
Formic acid
Formyl chloride
Phosgene
Trichloroacetic acid
Phosgene
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?
1 and 2
2 and 3
1 and 3
1, 2 and 3
1, 2 and 3
Aldol condensation cannot occur between —
two different aldehydes
two different ketones
an aldehydes and a ketone
an aldehydes and an ester
an aldehydes and an ester
In which one of the industries is pure silicon used?
Electronics
Paint
Pharmaceutical
Textile
Electronics
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-3, b-5, c-2, d-4
a-4, b-1, c-2, d-3
a-3, b-2, c-1, d-5
a-4, b-5, c-1, d-3
a-4, b-5, c-1, d-3
Which one of the following systems has maximum entropy?
One mole of water vapour
One mole of liquid water
One mole of solid water
One mole of water at triple point
One mole of water vapour
Who among the following does not have a chemical element named after him?
Albert Einstein
Enrico Fermi
Isaac Newton
Dmitri Mendeleev
Isaac Newton
Which one of the following is used in welding industry?
Methane
Ethane
Acetylene
Benzene
Acetylene
The most likely pH of an aqueous solution of sodium salt of ethyl alcohol is
3
5
7
9
7