Which of the following is not correct ?

• Hydrolysis of NCl₃ gives NH₃ and HOCl

• NH₃ is less stable than PH₃

• NH₃ is a weak reducing reagent compared to PH₃

• Nitric oxide in solid state exhibits diamagnetic property

Which of the following is correct?

• The pH of one litre solution containing 0.49 g of H₂SO₄ is 2.0

• The conjugate base of H₂S is S^2-

• BF₃ is a Lewis base

• Phenolphthalein is colourless in basic medium

Which of the following is correct ?

• Catalyst undergoes permanent chemical change

• Particle size of solute in true solution is 10^-3 m

• Starch solution is a hydrosol

• Hydrolysis of liquid ester in the presence of mineral acid is an example of heterogeneous catalysis reactions

The heat of formation of CO(g) and CO₂ (g)are $∆$H = -110 and $∆$H = - 393 kJ mol^-1 respectively. What is the heat of reaction ($∆$H) (in kJ mol^-1) for the following reaction?

CO (g) + $\frac{1}{2}{\mathrm{O}}^2$ (g) $\to$ CO₂(g)

• -504

• -142.5

• -283

• 504

What is the wavelength (in m) of a particle of mass 6.62 x 10^-29 g moving with a velocity of 10³ ms^-1?

• 6.62 x 10^-4

• 6.62 x 10^-3

• 10^-5

• 10⁵

What is the equation for the equilibrium constant (Kc) for the following reaction?

$\frac{1}{2}\mathrm{A}\left(\mathrm{g}\right) + \frac{1}{3}\mathrm{B}\left(\mathrm{g}\right) \stackrel{\mathrm{T}\left(\mathrm{K}\right)}{\rightleftharpoons } \frac{2}{3}\mathrm{C}\left(\mathrm{g}\right)$

• ${\mathrm{K}}_{\mathrm{c}} = \frac{{\left[\mathrm{A}\right]}^{{\displaystyle \raisebox{1ex}{$1$}\!\left/ \!\raisebox{-1ex}{$2 $}\right.}}{\left[\mathrm{B}\right]}^{{\displaystyle \raisebox{1ex}{$1$}\!\left/ \!\raisebox{-1ex}{$3$}\right.}}}{{\left[\mathrm{C}\right]}^{{\displaystyle \raisebox{1ex}{$3$}\!\left/ \!\raisebox{-1ex}{$2$}\right.}}}$

• ${\mathrm{K}}_{\mathrm{c}} = \frac{{\left[\mathrm{C}\right]}^{{\displaystyle \raisebox{1ex}{$3$}\!\left/ \!\raisebox{-1ex}{$2$}\right.}}}{{\left[\mathrm{A}\right]}^{2 }{\left[\mathrm{B}\right]}^3}$

• ${\mathrm{K}}_{\mathrm{c}} = \frac{{\left[\mathrm{C}\right]}^{{\displaystyle \raisebox{1ex}{$2$}\!\left/ \!\raisebox{-1ex}{$3$}\right.}}}{{\left[\mathrm{A}\right]}^{{\displaystyle \raisebox{1ex}{$1$}\!\left/ \!\raisebox{-1ex}{$2$}\right.}}{\left[\mathrm{B}\right]}^{{\displaystyle \raisebox{1ex}{$1$}\!\left/ \!\raisebox{-1ex}{$3$}\right.}}}$

• ${\mathrm{K}}_{\mathrm{c}} = \frac{{\left[\mathrm{C}\right]}^{{\displaystyle \raisebox{1ex}{$2$}\!\left/ \!\raisebox{-1ex}{$3$}\right.}}}{{\left[\mathrm{A}\right]}^{{\displaystyle \raisebox{1ex}{$1$}\!\left/ \!\raisebox{-1ex}{$2$}\right.}}+{\left[\mathrm{B}\right]}^{{\displaystyle \raisebox{1ex}{$1$}\!\left/ \!\raisebox{-1ex}{$3$}\right.}}}$

7.

A 0.5 g/L solution of glucose is found to be isotonic with a 2.5 g/L solution of an organic compound. What will be the molecular weight of that organic compound ?

• 300

• 600

• 900

• 200

H-O-H bond angle in H₂O is 104.5° and not 109° 28' because of

• lone pair-lone pair repulsion

• lone pair-bond pair repulsion

• bond pair-bond pair repulsion

• high electronegativity of oxygen

A 0.1 aqueous solution of a weak acid is 2% ionised. If the ionic product of water is 1 x 10^-4, the [OH^-] is

• 5 x 10^-12 M

• 2 x 10^-3 M

• 1 x 10^-14 M

• None of these

The total number of orbitals in the fifth energy level is

• 5

• 10

• 18

• 25