Chemistry

1) The high reactivity of fluorine is due to:

a) Its high electro negativity.
b) Small size of fluorine atom.
c) Availability of d-orbitals.
d) Strong F – F bond.

ANSWER : Its high electro negativity

2) The iron ore magnetite consists of:

a) Fe₂O_{3
b) Fe3OH4}

c) FeCO_{3
d) 3Fe2O3, 3H2O}

_{ANSWER : Fe2O3}

3) Which among the following is most electronegative element?

a) Sodium.
b) Bromine.
c) Fluorine.
d) Oxygen.

ANSWER : Fluorine

4) Which is the most commonly used bleaching agent?

a) Alcohol.
b) Carbon dioxide.
c) Chlorine.
d) Sodium chlorine.

ANSWER : Chlorine

5) Which is the method that cannot be used to remove permanent hardness of water?

a) Distillation.
b) Boiling.
c) Adding caustic soda.
d) Adding sodium carbonate.

ANSWER : Boiling

6) The number of moles of solute present in 1 kg of a solvent is called its………….

a) Molality.
b) Normality.
c) Formality.
d) Molarity.

ANSWER : Molality

7) Using which of the metallurgical process a metal is obtained in a fused state?

a) Roasting.
b) Froth flotation.
c) Calcinations.
d) Smelting.

ANSWER : Smelting

8) Among the following the molecules of which gas have highest speed?

a) CH₄ at 300K.
b) H₂ at 73°C.
c) N₂ at 1027°C.
d) O₂ at 0°C.

ANSWER : H₂ at 73°C

9) The heat required to raise the temperature of body by 1 K is called:

a) Specific heat.
b) Thermal capacity.
c) Water equivalent.
d) None of these.

ANSWER : Thermal capacity

10) The octane number of zero is assigned to:

a) 2-methyl octane.
b) n-heptane.
c) iso-octane.
d) 3-methyl octane.

ANSWER : n-heptane