Chemistry MCQS with Answers Set 5

1 mole of CH₄ contains

6.02 x 10²³ atoms of H

3.0 g of carbon

1.81 x 1023 molecules of CH₄

4 g-atom of hydrogen

Isopropyl alcohol on oxidation forms

Ether

Acetone

Ethylene

Acetaldehyde

Phosphide ion has the electronic structure similar to that of

Fluoride ion

Chloride ion

Nitride ion

Sodium ion

Which of the following represents elements in order of increasing atomic size?

C,N,O

I,Br,CI

Li,Na,K

Na,Mg,C

The bond angle H – O – H in ice is closest to

60°

120° , 28°

90°

109°

In crystal structure of sodium chloride the arrangement of CI^– ions is

None of these

Bee

Both fee and bcc

Fee

Portland cement is manufactured by using

Limestone,clay and gypsum

Limestone,gypsum and sand

Limestone,clay and sand

Limestone,gypsum and alumina

Octane number can be changed by

Alkylation

All of these

Isomerisation

Cyclisation

All the naturally occurring processes proceed spontaneously in a direction which lead to

Decrease of entropy

Increase of free energy

Decrease of free energy

Increase of enthalpy

Chile salt petre is

Na₂S₂O₃

NaNO₃

Na₂SO₄

KNO₃