When 50cm³ of 0.2N H₂SO₄ is mixed with 50 cm³ of 1N KOH, the heat liberated is

• 11.46 kJ

• 57.3 kJ

• 573 kJ

• 573 J

An artificial radioactive isotope gave ${}_7^{14}$N after two successive β-particle emissions. The number of neutrons in the parent nucleus must be

• 9

• 14

• 5

• 7

A solution contains 1.2046 x 10²⁴ hydrochloric acid molecules in one dm³ of the solution. The strength of the solution is

• 6N

• 2N

• 4N

• 8N

4.

Nuclear theory of the atom was put forward by

• Rutherford

• Aston

• Neils Bohr

• J.J. Thomson

The enthalpy of reaction,

${\mathrm{H}}_2\left(\mathrm{g}\right) +\frac{1}{2}{\mathrm{O}}_2\left(\mathrm{g}\right) \to {\mathrm{H}}_2\mathrm{O}\left(\mathrm{g}\right) \mathrm{is}\hspace{0.17em}∆{\mathrm{H}}_1 \mathrm{and} \mathrm{that} \mathrm{of} H_2\left(\mathrm{g}\right) +\frac{1}{2}{\mathrm{O}}_2\left(\mathrm{g}\right) \to {\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right) \mathrm{is}\hspace{0.17em}∆{\mathrm{H}}_2.\mathrm{Then}$

• ΔH₁ < ΔH₂

• ΔH₁ + ΔH₂ = 0

• ΔH₁ > ΔH₂

• ΔH₁ = ΔH₂

The pressure and temperature of 4 dm³ of carbon dioxide gas are doubled. Then the volume of carbon dioxide gas would be

• 2 dm³

• 3 dm³

• 4 dm³

• 8 dm³

4g of copper was dissolved in concentrated nitric acid. The copper nitrate solution on strong heating gave 5 g of its oxide. The equivalent weight of copper is

• 23

• 32

• 12

• 20

The chemical equilibrium of a reversible reaction is not influenced by

• pressure

• catalyst

• concentration of the reaction

• temperature

The number of 2p electrons having spin quantum number s =-1/2 are

• 6

• 0

• 2

• 3

56g of nitrogen and 8g of hydrogen gas are heated in a closed vessel. At equilibrium 34 g of ammonia are present. The equilibrium number of moles of nitrogen,hydrogen and ammonia respectively are

• 1,2,2

• 2,2,1

• 1,1,2

• 2,1,2