The time for half life period of a certain reaction A - Products is 1 hour. When the initial concentration of the reactant ‘A’, is 2.0 mol L
, how much time does it take for its concentration to come from 0.50 to 0.25 mol L^–1 if it is a zero order reaction? 

1)   4 h 
2)   0.5 h
3)  0.25 h
4)  1 h  

The correct sequence of decreasing order of reactivity of hydrolysis of acid chlorides is :

1) PhCOC l> p−O2NC6H4COCl > p−CH₃OC₆H₄COCl
2) PhCOCl > p−CH₃OC6H4COCl > p−O2NC₆H₄COCl
3) p−O₂NC₆H₄COCl > PhCOCl > p−CH₃OC₆H₄COCl
4) p−O₂NC₆H₄COCl > p−CH₃OC₆H₄COCl > PhCOCl

The highest magnetic moment is shown by the transition metal with the configuration:

1) 3d²
2) 3d⁶
3) 3d⁷
4) 3d⁹

Clemmensen reduction of a ketone is carried out in the presence of which of the following reagent?

1) $$Zn-Hg$$ with $$HCl$$
2) $$LiAl{H}_{4}$$
3) $${H}_{2}$$ and $$Pt$$ as catalyst
4) Glycol with $$KOH$$

Maximum coordination number of oxygen in liquid water is

1) two
2) three
3) four
4) five

The rate constant of a zero order reaction is 0.2 mol dm⁻³h⁻¹. If the concentration of the reactant after 30 minutes is 0.5 mol dm⁻³. Then its initial concentration would be :-

1) 0.60 mol dm⁻³
2) 0.15 mol dm⁻³
3) 0.25 mol dm⁻³
4) 4.00 mol dm⁻³

If atoms of elements have completely filled outermost shell then their combining capacity or valency is :
1) one
2) two
3) zero
4) five

The minimum voltage needed to carry out electrolysis in the reaction is 

 (F= 96500 Cmol^-1)
 

1) 2.14
2) 4.28
3) 6.42
4) 8.56

In the extraction of silver from silver halide or silver sulphide the process used is

1) electrometallurgy

2) hydrometallurgy

3) pyrornetallurgy

4) smelting

The starting material used in Solvay's process is

1)  Brine solution

2)  Sodium sulphate

3)  Carnallite

4)  All of them together