Stoichiometry MCQs

Question 1

C p - C v , for an ideal gas is equal to

Accepted Answer

R

Answer

$$\frac{{	ext{R}}}{2}$$

Answer

2R

Answer

3R

Question 2

Na 2 SO 4 .10H 2 O crystals are formed by cooling 100 Kg of 30% by weight aqueous solution of Na 2 SO 4 . The final concentration of the solute in the solution is 10%. The weight of crystals is

Accepted Answer

58.65

Answer

20

Answer

32.2

Answer

45.35

Question 3

Pick out the wrong statement.

Accepted Answer

One kg mole of an ideal gas at N.T.P. occupies 22400 Nm 3

Answer

Ten times dilution of a normal solution (N) reduces its normality to $$\frac{{	ext{N}}}{{10}}$$

Answer

When equal weights of oxygen and methane are mixed in an empty reactor at room temperature, then the fraction of total pressure exerted by the oxygen is $$\frac{1}{2}$$

Answer

Volume occupied by 9.034 × 10 23 atoms of oxygen in ozone (O 3 ) at N.T.P. will be 11200 c.c

Question 4

The number of water molecules present in a drop of water weighing 0.018 gm is 6.023 x __________

Accepted Answer

10 20

Answer

10 26

Answer

10 23

Answer

10 19

Question 5

In a chemical process, the recycle stream is purged for

Accepted Answer

Limiting the inerts

Answer

Increasing the product yield

Answer

Enriching the product

Answer

Heat conservation

Question 6

Pick out the wrong statement.

Accepted Answer

Raoult's law holds good for the solubility of polar gases in non-polar liquids

Answer

Molecules with symmetrical arrangement (e.g., CH 4 and CCl 4 ) are non-polar

Answer

Most of the hydrocarbons are nonpolar

Answer

Generally, non-polar compounds are chemically inactive, conduct electricity poorly and do not ionise

Question 7

Heat of reaction is not influenced by

Accepted Answer

The route/method through which final products are obtained

Answer

The physical state (e.g., solid, liquid or gaseous) of reactants and products

Answer

Whether the reaction is carried out at constant temperature or constant pressure

Answer

None of these

Question 8

The number of atoms of oxygen present in 11.2 litres of ozone (O 3 ) at N.T.P. are

Accepted Answer

9.03 × 10 24

Answer

3.01 × 10 22

Answer

6.02 × 10 23

Answer

1.20 × 10 24

Question 9

Elements in a periodic table are arranged in order of their

Accepted Answer

Atomic number

Answer

Mass number

Answer

Atomic weight

Answer

Metallic characteristics