5 ml of 1N HCl, 20 ml of $$\dfrac{N}{2}$$ $$H_2SO_4$$ and $$30$$ ml of $$\dfrac{N}{3}$$ $$HNO_3$$ are mixed together and the volume is made to $$1$$ L. The normality of the resulting solution is :

1) $$\dfrac{N}{5}$$
2) $$\dfrac{N}{10}$$
3) $$\dfrac{N}{20}$$
4) $$\dfrac{N}{40}$$

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 $$KOH$$

Which among the following is not iso-electronic?

1)  O₂²⁺

2)  NO ^-

3)  CN ^-

4)  N₂

The order of ease of oxidation of the ions F⁻, OH−, Br⁻ ,$${SO}_{4}^{2-}$$ is:

1) $${SO}_{4}^{2-}<{Br}^{-}<{OH}^{-}< {F}^{-}$$ 
2) $${SO}_{4}^{2-}> {F}^{-}> {Br}^{-}> {OH}^{-}$$
3) $${SO}_{4}^{2-}< {F}^{-}< {Br}^{-}< {OH}^{-}$$
4) $${OH}^{-}< {Br}^{-}< {F}^{-}< {SO}_{4}^{2-}$$

If the half-life of an isotope X is 10 years, its decay constant is

1)  0.00692 Yr ^-1

2)  0.06932 Yr ^-1

3)  0.6932 Yr ^-1

4)  6.932 Yr ^-1

The reaction conditions leading to the best yield of C₂H₅Cl are:

1) C₂H₆(excess) + Cl₂→
2) C₂H₆ + Cl₂→
3) C₂H₆ + Cl₂(excess)→
4) none of these

A formula of a compound, which gives simple whole number atomic ratio in one molecule of a compound, is called

1)  Diastereoisomerism

2)  Geometry isomerism

3)  Keto-enol isomerism

4)  Enantisomerism

The hardness of water is estimated by

1)  distillation method

2)  titrimetric method

3)  EDTA method

4)  conductivity method

Equilibrium constant for the reaction:
Ag⁺ + 2CN^- ? [Ag(CN)2]^-
at 25^oC is 2.5 × 10¹⁸. Calculate silver ion concentration (in terms of 10^-17 M) in a solution  which was originally 0.10 M in KCN and 0.03 M in AgNO₃.

1) 0.75
2) 1.85
3) 0.61
4) 1.24

The solubility of CaF₂ (Ksp=5.3×10⁻⁹ ) in 0.1M solution of NaF would be : (Assume no reaction of cation/anion)

1) 5.3×10⁻¹⁰M
2) 5.3×10⁻⁸M
3) 5.3×10⁻⁷M
4) 5.3×10⁻¹¹M