Specific volume of cylindrical virus particle is 6.02 × 10^-2 cc/gm whose radius and length are 7 Å and 10 Å respectively. If N_A= 6.02 ×10²³, find molecular weight of virus.
1) 15.4 kg/mol
2) 1.54 × 10⁴ kg/mol
3) 3.08 × 10⁴ kg/mol
4) 3.08 × 10³ kg/mol

Phenol is most easily soluble in

1. sodium carbonate solution 
2. sodium hydroxide solution 
3. dilute HCl 
4. both sodium hydroxide and dilute HCl 

The maximum number of isomers (including stereoisomers) that are possible on monochlorination of the following compound, is


1) 4
2) 7
3) 6
4) 8

The rate constant for a second order reaction is 8×10⁻⁵M⁻¹ min⁻¹. How long will it take a 1M solution to be reduced to 0.5M?

1) 8.66 × 10³ minute
2) 8×10⁻⁵ minute
3) 1.25×10⁴ minute
4) 4×10⁻⁵ minute

The compound if contains an even number 'n' of chiral carbons, but the molecule can be divided into two equal and si,ilar halves , then how many optical active form it will have :

1) 2ⁿ
2) 2⁽ⁿ⁻¹⁾
3) 2^(n−1)/2
4) 2⁽ⁿ⁻¹⁾−2^(n−1)/2

In electro-refining of copper some gold is deposited as :

1) Electrolyte
2) Cathode
3) Cathode mud
4) Anode mud

Which of the following ore is best concentrated by froth flotation method ?

1) Galena
2) Cassiterite
3) Magnetite
4) none

Consider the following statements,. the d-orbitals have
(i) four lobes and two nodes
(ii) four lobes and one node
(iii)same sign in opposite lobs
(iv)opposite sign in the opposite lobs

1) i alone
2) i and iii
3) ii and iii
4) i and iv

Alkaline earth metals have only positive oxidation state. This is due to their:

1) high melting points
2) high electronegativity
3) softness
4) low ionization potential

When 0.5g. of sulphur is burnt to SO₂ 4.6 kj of heat is liberated. What is the enthalpy of formation of sulphur dioxide? (S=32 and O=16)

1) -147.2KJ
2) + 147.2KJ
3) + 294.4KJ
4) - 294.4KJ.