STOICHIOMETRY QUIZ

The unit of specific heat at constant pressure, Cp, in SI unit is

J/kg°K

W/m°K

W/m²°C

J/m³°K

TRUE ANSWER : ?
YOUR ANSWER : ?

The number of atoms of oxygen present in 11.2 litres of ozone (O₃) at N.T.P. are

1.20 x 10²⁴

9.03 x 10²⁴

6.02 x 10²³

3.01 x 10²²

TRUE ANSWER : ?
YOUR ANSWER : ?

In a neutral solution

None of these

Both H⁺ and OH⁻ ions are present in very small but equal concentration

OH⁻ ions are absent

H⁺ ions are absent

TRUE ANSWER : ?
YOUR ANSWER : ?

The value of (Cp - Cv)for a real gas obeying Vander Wall's equation is

0.5 R

R

> R

< R

TRUE ANSWER : ?
YOUR ANSWER : ?

What fraction of the total pressure is exerted by oxygen, if equal weights of oxygen and methane are mixed in an empty vessel at 25°C?

43833

43832

L/3 x 298/273

43864

TRUE ANSWER : ?
YOUR ANSWER : ?

The vapor pressure of water at 100°C is

13.6 cms of Hg

760 mm wc

76 cms of Hg

100N/m²

TRUE ANSWER : ?
YOUR ANSWER : ?

The heat of vaporisation __________ with increase in pressure.

Becomes zero at critical pressure

Both B and C

Increases

Decreases

TRUE ANSWER : ?
YOUR ANSWER : ?

1 kg of calcium carbide (CaC₂) produces about 0.41 kg of acetylene gas on treatment with water. How many hours of service can be derived from 1 kg of calcium carbide in an acetylene lamp burning 35 litres of gas at NTP per hour?

15

20

5

10

TRUE ANSWER : ?
YOUR ANSWER : ?

Real gases approach ideal behaviour at

High pressure & low temperature

Low pressure & low temperature

Low pressure & high temperature

High pressure & high temperature

TRUE ANSWER : ?
YOUR ANSWER : ?

The hydroxyl ion (OH?) concentration in a solution having pH value 3 will be

10??

TRUE ANSWER : ?
YOUR ANSWER : ?

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