How many litres of oxygen (at STP) are required for complete combustion of 39 g of liquid benzene? (Atomic weights: C = 12, O = 16, H = 1).

• 84

• 22.4

• 42

• 11.2

In which of the following reactions, H₂O₂ acts as a reducing reagent?

• PbO₂(s) + H₂O(aq) → PbO(s) + H₂O(l) +  O₂(g)

• Na₂SO₃(aq) + H₂O₂(aq) → Na₂SO₄(aq) + H₂O(l)

• 2KI(aq) + H₂O₂(aq) → 2KOH(aq) + I₂(s)

• KNO₂(aq) + H₂O₂(aq) → KNO₃(aq) + H₂O(l)

.... process is used for the removal of hardness of water.

• Calgon

• Baeyer

• Serpeck

• Hoope

In organic reactions, sodium in liquid ammonia is used as

• reducing agent

• hydrating agent

• oxidising agent

• precipitating agent

What is the molecular formula of borazole ?

• B₂H₆

• B₆N₆H₆

• B₃N₃H₆

• B₃N₃H₃

Which one of the following is mainly responsible for depletion of ozone layer?

• Methane

• Cabon dioxide

• Water

• Chloro-fluoro carbons

The structural formula of 2-methyl-2-butene is

• CH₃-CH(CH₃)-CH=CH₂

• CH₃-CH₂-C(CH₃)=CH₂

• CH₃-CH=CH-CH₃

• CH₃-CH=C(CH₃)-CH₃

Which one of the following pairs of compounds are functional isomers?

• CH₃CH₂CH₂OH, (CH₃)₂CHCH₂OH

• CH₃CH₂CH₂CH₂OH, (CH₃)₂CHCH₂OH

• CH₃CH₂CH₂OH, CH₃CH₂CH₂Cl

• CH₃CH₂CH₂OH, CH₃-O-CH₂CH₃

What is Y in the following reaction?

C₂H₅I + NaOC₂H₅ → X + NaI

X + 2HHI  2Y + H₂O

• C₂H₆

• C₂H₅I

• C₂H₄

• C₂H₅OC₂H₅

30.

Dry distillation of calcium acetate and calcium formate forms:

• methanol

• ethanal

• ethanol

• acetone