The reaction quotient 'Q' is useful in predicting the direction of the reaction. Which of the following is incorrect?

• If Q_c < K_c, the forward reaction is favoured

• If Q_c > K_c, the forward reaction is favoured

• If Q_c >K_c, the forward reaction is favoured and Q_c =K_c, no reaction occur.

• None of these

Which of the following structure of a molecule is expected to have three bond pairs and one lone pair of electrons?

• Octahedral

• Trigonal planar

• Pyramidal

• Tetrahedral

A reaction has both ΔH and ΔS-ve. The rate of reaction

• increases with increases in temperature

• cannot be predicted for change in temperature

• increases with decreases in temperature

• remains unaffected by change in temperature

The correct set of quantum number for the unpaired electrons of chlorine atoms is

• 2, 1, -1, +1/2

• 2, 0, 0,+ 1/2

• 3, 1, 1, ±1/2

• 3, 0, 0, ±1/2

The equilibrium constant for the reaction N₂(g) + O₂(g) $\rightleftharpoons$2NO(g) is 4×10^-4 at 200K. In presence of a catalyst the equilibrium is attained ten times faster. Therefore the equilibrium constant in presence of catalyst 2000 K is 

• 4×10^-3

• 4×10^-2

• 40×10^-4

• 4×10^-4

Which of the following is correct electron dot structure of N₂O molecule?

• :N=N=Ö:

• $:\mathrm{N}\equiv \stackrel{+}{\mathrm{N}}-\underset{..}{\overset{..}{\mathrm{O}}}:$

• $:\stackrel{..}{\mathrm{N}}=\mathrm{N}=\underset{..}{\overset{..}{\mathrm{O}}}$

• $:\stackrel{..}{\mathrm{N}}=\mathrm{N}-\underset{..}{\overset{..}{\mathrm{O}}}$

If 3.01 × 10²⁰ molecules are removed from 98 mg of H₂SO₄, then number of moles of H₂SO₄ left are

• 0.1 × 10^-3 mol

• 9.95 × 10^-2 mol

• 0.5 × 10^-3 mol

• 1.66 × 10^-3 mol

The electronegativities of C, N, Si and P are in the order of

• P < Si<C < N

• Si <P < C<N

• P < Si < N < C

• Si <P < N <C

Addition of mineral acid to an aqueous solution of borax, the following compound is formed

• pyroboric acid

• boron hydride

• meta boric acid

• orthoboric acid

Which one of the following is not a common component of photo-chemical smog?

• Ozone

• Acrolein

• Peroxy acetyl nitrate

• Chloroflourocarbons