CBSE
Both Mg and Fe metal can reduce copper from a solution having Cu2+ ion, according to equilibria.
Mg(s) + Cu2+ Mg2+ + Cu(s); K1 = 6 x 1090
Fe(s) + Cu2+ Fe2+ + Cu(s); K2 = 3 x 1026
Choose the correct option regarding above equilibrium
Mg removes more Cu2+ from solution
Fe removes more Cu2+ from solution
Both will equally remove Cu2+ from solution
Both metals cannot remove Cu2+ from solution
The melting point of solid substances is directly proportional to pressure acting on them. However, ice-melts at a temperature lower than its usual melting point, when the pressure increases. This is because
ice is not a true solid
the bonds break under pressure
ice is less denser than water
pressure generates heat
For the reaction, N2(g) + O2(g) 2NO (g), the equilibrium constant is K1. The equilibrium constant is K2 for the reaction, 2NO(g) + O2)g) 2NO2(g). What is K for the reaction, NO2(g) ?
100 mL of a solution contains 2 g of acetic acid and 3g of sodium acetate providing Ka =1.8 x 10-5 , then choose the correct option.
This solution is basic in nature
This solution is acidic in nature
This solution is amphoteric in nature
This solution is neutral in nature
A buffer solution is prepared in which the concentration of NH3 is 0.30 M and the concentration of N is 0.20 M. If the equilibrium constant, Kb for NH3 equals 1. 8 x 10-5, what is the pH of this solution? (log 2. 7 =0. 43).
9.43
11.72
8.73
9.08
Aqueous solution of AlCl3 is acidic towards litmus while of NaCl is not. The correct reason behind this is
AlCl3, furnishes OH- ion in the solution
AlCl3, furnishes H+ ion in the solution
AlCl3, furnishes both H+ well as OH- ion in the solution
AlCl3, is the salt of strong base and strong acid
In an amino acid, the carboxyl group ionises at pKa = 2.34 and ammonium ion at pKa2 = 9.60. The isoelectric point of the amino acid is at pH
4.32
3.34
9.46
5.97
At radioactive equilibrium, the ratio between two atoms of radioactive elements A and B is 3.1 x 109 : 1. If the half-life period of A is 2 x 1010 yrs, then the half-life of B is
9.54 yrs
2.14 yrs
3.29 yrs
6.45 yrs
Which of the following is least likely to behave as Lewis base?
NH3
BF3
OH-
H2O
The dissociation equilibrium of a gas AB2 can be represented as
2AB2 (g) 2AB (g) + B2(g)
The degree of dissociation is 'x' and is small compared to 1. The expression relating the degree of dissociation (x) with equilibrium constant KP and total pressure p is