What would be the heat released when an aqueous solution containing 0.5 mole of HNO₃ is mixed with 0.3 mole of OH^- (enthalpy of neutralization is -57.1 k.J) ?

• 28.5 kJ

• 17.1 kJ

• 45.7 kJ

• 1.7 kJ

$\mathrm{A}\left(\mathrm{g}\right) + 3\mathrm{B}\left(\mathrm{g}\right)\hspace{0.17em} \rightleftharpoons 4\mathrm{C}\left(\mathrm{g}\right)$.Initially concentration of A is equal to that of B. The equilibrium concentrations of A and C are equal. K_c is 

• 0.08

• 0.8

• 8

• 80

Two moles of PCl₅, is heated in a closed vessel of 2 L capacity. When the equilibrium is attained 40% of it has been found to be dissociated. What is the K_c in mol/dm³?

• 0.532

• 0.266

• 0.133

• 0.174

How much of sulphur is present in an organic compound, if 0.53 g of the compound gave 1.158 g of BaSO₄ on analysis ? 

• 10%

• 20%

• 30%

• 15%

100 g CaCO₃ is treated with 1 L of 1N HCl. What would be the weight of CO₂ liberated after the completion of the reaction ?

• 55 g

• 11 g

• 22 g

• 33 g

The relationship between the energy E₁ of the radiation with a wavelength 8000 Å and the energy E₂ of the radiation with a wavelength Å 16000  is:

• E₁ = 6E₂

• E₁ = 2E₂

• E₁ = 4E₂

• E₁ = 4E₂

If the molecule of HCl were totally polar, the expected value of dipole moment is 6.12 D (debye), but the experimental value of dipole moment was 1.03 D. Calculate the percentage ionic character :

• 17

• 83

• 50

• Zero

Which one of the following molecules has the smallest bond angle ?

• NH₃

• PH₃

• H₂O

• H₂Se

9.

If the absolute temperature of a gas is doubled and the pressure is reduced to one half, the volume of the gas will :

• remain unchanged

• be doubled

• increase four fold

• be halved

To what temperature must a neon gas sample be heated to double its pressure, if the initial volume of gas at 75°C is decreased by 15.0%?

• 319°C

• 592°C

• 128°C

• 60°C