The standard molar heat of formation of ethane, CO₂ and water (l) are respectively -21.1, -94.1 and -68.3 kcal. The standard molar heat of combustion of ethane will be

• -372 kcal

• 162 kcal

• -240 kcal

• 183.5 kcal

The solubility product of Ag₂CrO₄ is 32 x 10^-12.What is the concentration of CrO₄^- ions in that solution?

• 2x 10^-4 M

• 16x 10^-4 M

• 8x 10^-4 M

• 8x 10^-8 M

A gaseous mixture containing He, CH₄ and SO₂ was allowed to effuse through a fine hole then find what molar ratio of gases coming out initially? (Given mixture contains He, CH₄ and SO₂ in 1 : 2: 3 mole ratio).

• $\sqrt{2}:\sqrt{2}: 3$

• 2: 2: 3

• 4: 4: 3

• 1: 1: 3

According to Bohr's theory, the angular momentum for an electron of 3rd orbit is

• 3h

• 1.5h

• 9h

• $2\frac{\mathrm{h}}{\mathrm{\pi }}$

5.

2.76 g of silver carbonate on being strongly heated yields a residue weighing

• 3.45g 

• 3.0g

• 1.36g

• 2.16g

Which of the following has the maximum number of unpaired d-electrons?

• Fe²⁺

• Cu⁺

• Zn

• Ni³⁺

The volume strenght  of 1.5 N H₂O₂ solution is 

• 16.8L

• 8.4L

• 4.2L

• 5.2L

Among [Fe(H₂O)₆]⁺, [Fe(CN)₆]^3-, [Fe(Cl)₆]^3- species, the hybridisation state of the Fe atom are, respectively.

• d²sp³, d²sp³, sp³d²

• sp³d²,d²sp³, d²sp³

• sp³d², d²sp³,sp³d²

• None of the above

The rate constant for forward reaction and backward reaction of hydrolysis of ester are 1.1 x10^-2 and 1.5 x10^-3 per minute respectively. Equilibrium constant for the reaction is

      ${\mathrm{CH}}_3{\mathrm{COOC}}_2{\mathrm{H}}_5 + {\mathrm{H}}_2\mathrm{O} \rightleftharpoons {\mathrm{CH}}_3\mathrm{COOH} + {\mathrm{C}}_2{\mathrm{H}}_5\mathrm{OH}$

• 33.7

• 7.33

• 5.33

• 33.3

19.85 mL of 0.1 N NaOH reacts with 20 mL of HCl solution for complete neutralisation. The molarity of HCl solution is

• 9.9

• 0.99

• 0.099

• 0.0099