The reaction quotient 'Q' is useful in predicting the direction of the reaction. Which of the following is incorrect?
If Qc < Kc, the forward reaction is favoured
If Qc > Kc, the forward reaction is favoured
If Qc >Kc, the forward reaction is favoured and Qc =Kc, 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) 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
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
D.
Chloroflourocarbons
Photochermical smog is a mixture of air pollutants which have been chemically altered into further noxious compounds by exposure to sunlight the main components of photochemical smog are ozone, peroxy acetyl mtrate (PAN), nitrogen oxides, voltaltile organic compounds etc.