Which of the following reactions does not liberate gaseous product ?
AlCl3 + NaOH →
NaOH + P(white) + H2O →
Al + NaOH
Zn + NaOH
CH3CH2OH CH3CHO Cl3CCHO
In the above reaction, the role of Cl2 in Step-1 and Step-2 respectively is:
oxidation, chlorination
reduction, chlorination
oxidation, addition
reduction,substitution
A.
oxidation, chlorination
CH3CH2OH CH3CHO
The above reaction is an example of oxidation. Due to oxidation -CH2OH group is oxidised to -CHO group.
CH3CHO Cl3 C.CHO
In the second step chlorination takes palce. In chlorination hydrogen atom changes by chlorine.
The number of sigma (σ) and pi () bonds present in benzene respectively are :
12, 6
6, 6
6, 12
12, 3
The standard reduction potentials of Zn2+| Zn, Cu2+| Cu and Ag+| Ag are respectively -0.76, 0.34 and 0.8 V. The following cells were constructed :
(1) Zn | Zn2+ || Cu2+ | Cu
(2) Zn | Zn2+ || Ag+ | Ag
(3) Cu | Cu2+ || Ag+ |Ag
What is the correct order of E of these cells?
2 > 3 > 1
2 > 1 > 3
1 > 2 > 3
3 > 1 > 2
What is the time (in sec) required for depositing all the silver present in 125 mL of 1 M AgNO3 solution by passing a current of 241.25 A? (1F = 96500 coulombs)
10
50
1000
100
The disperse phase, dispersion medium and nature of colloidal solution (lyophilic or lyophobic) of 'gold sol' respectively are :
solid, solid, lyophobic
liquid, liquid, lyophobic
solid, liquid, lyophobic
solid, liquid, lyophilic
Electrolysis of X gives Y at anode. Vacuum distillation of Y gives H2O. The number of peroxy (O-O) bonds present in X and Y respectively are :
1, 1
1, 2
zero, 1
zero, zero
AB is an ionic solid. The ionic radii of A+ and B- are respectively rc and ra. Lattice energy of AB is proportional to :
(rc + ra)
The rate constant of a first order reaction at 27°C is 10-3 min-1. The temperature coefficient of this reaction is 2. What is the rate constant (in min-1 ) at 17°C for this reaction ?
10-3
5 × 10-4
2 × 10-3
10-2
What is the correct order of occurrence (% by weight) in air of Ne, Ar and Kr ?
Ne > Ar > Kr
Ar > Ne > Kr
Ar > Kr > Ne
Ne > Kr > Ar