The decay constant of a radioactive sample is λ. The half-life and mean life of the sample are, respectively
Which of the following is a first order reaction?
NH4NO2 →N2 + 2H2O
2HI → H2 + I2
2NO2 → 2NO + O2
2NO + O2 → 2NO2
In the reaction of A + 2B → C + 2D, the initial rate = att = 0 wasfound to be 2.6 × 10-2 M s-1. What is the value of at t = 0 in Ms-1 ?
2.6 × 10-2
5.2 × 10-2
1.0 × 10-1
6.5 × 10-3
Copper sulphate solution is electrolysed using copper electrode. The reaction taking place at anode is
H+ + e- → H
SO (aq) → SO4 + 2e-
Cu2+ + 2e- → Cu
Cu (s) → Cu2+ (aq) + 2e-
How many cc of oxygen will be liberated by 2 A current flowing for 3 min 13 s through acidulated water?
11.2 cc
33.6 cc
44.8 cc
22.4 cc
D.
22.4 cc
When acidulated water is electrolysed, the following reactions will take place at anode and cathode.
At cathode,
2H+ (aq) + 2e- → H2 (g)
At anode,
2H2O (l) → O2(g) + 4H+ (aq) + 4e-
The net reaction is
2H2 (g) + O2 (g)
From the reaction of the anode, it is clear that 4F liberates oxygen = 22400 cc
(3 × 60 / 13) × 2C electricity will liberate O2.
=
= 22.4 cc
Which of the following will have the highest coagulating power for As2S3 colloid?
PO
SO
Al3+
Na+
Adsorption is multilayer in the case of
physical adsorption
chemisorption
Both (a) and (b)
None of the above
In electrorefining of metal, the impure metal is made the anode and a strip of pure metal the cathode during the electrolysis of an aqueous solution of a complex metal salt. This method cannot be used for refining of
silver
copper
aluminium
zinc