Stoichiometry MCQs

Question 1

A bypass stream in a chemical process is useful, because it

Accepted Answer

Facilitates better control of the process

Answer

Improves the conversion

Answer

Increases the yield of products

Answer

None of these

Question 2

The vapour pressure of water is given by, in P sat = A - (5000/T), where A is a constant, Psat is the vapour pressure in atm. and T is the temperature in K.The vapor pressure of water in atm. at 50°C is approximately

Accepted Answer

0.13

Answer

0.07

Answer

0.09

Answer

0.11

Question 3

Which of the following holds good for a solution obeying Raoult's law (i.e., an ideal solution) (where, ΔH = heat of mixing, and ΔV = volume change on mixing ) ?

Accepted Answer

Both B and C

Answer

ΔH = 1 (+ ve)and Δ V = -ve

Answer

ΔH = 0

Answer

ΔV = 0

Question 4

Pick out the correct statement.

Accepted Answer

At equilibrium, ΔG is zero

Answer

Heat of solution is always positive

Answer

For the reaction, PCl 5 ⇋ PCl 3 + Cl 2 , ΔG is less than ΔE

Answer

The heating of water in a beaker is an example of an isolated system

Question 5

In case of vapor-liquid equilibria, which of the following does not account for gas phase deviation from ideality?

Accepted Answer

Activity co-efficient

Answer

Use of equation of state

Answer

Fugacity co-efficient

Answer

None of these

Question 6

Concentration of a solution expressed in terms of __________ is independent of temperature.

Accepted Answer

Molality

Answer

Molarity

Answer

Normality

Answer

None of these

Question 7

In the reaction, represented by Na 2 CO 3 + HCl → NaHO 3 + NaCl, the equivalent weight of Na 2 CO 3 is

Accepted Answer

106

Answer

53

Answer

5.3

Answer

10.6

Question 8

Which of the following gravity scales is used exclusively for liquids heavier than water?

Accepted Answer

Twaddel scale

Answer

Baumme scale

Answer

API scale

Answer

None of these

Question 9

Pick out the wrong statement.

Accepted Answer

Equal volumes of Argon and Krypton contain equal number of atoms

Answer

Heat capacity of a diatomic gas is higher than that of a monoatomic gas

Answer

Total number of molecules contained in 22.4 litres of hydrogen at NTP is 6.023 x 10 23

Answer

The binary mixture of a particular com-positidn in both vapor and liquid state is known as an azeotropic mixture