If the molecular wt. of Na₂S₂O₃ and I₂ are M₁ and M₂ respectively then what will be the equivalent weight of Na₂S₂O₃ and I₂ in the following reaction?

2S₂O₃^2- + I₂ $\to$ S₄O₆^2- + 2I^-

• M₁ , M₂

• M₁ , M₂/2

• 2M₁ , M₂

• M₁ , 2M₂

A radioactive atom ${}_{\mathrm{Y}}{}^{\mathrm{X}}\mathrm{M}$ emits two $\mathrm{\alpha }$ particles and one $\mathrm{\beta }$ particle successively. The number of neutrons in the nucleus of the product will be:

• X - 4 - Y

• X - Y - 5

• X - Y - 3

• X - Y - 6

The sp³d² hybridisation of central atom of a molecule would lead to:

• square planar geometry

• tetrahedral geometry

• trigonal bipyramidal geometry

• octahedral geometry

The normality of 30 volume H₂O₂ is:

• 2.678 N

• 5.336 N

• 8.034 N

• 6.685 N

The solubility of Ca₃(PO₄)₂ in water is y mol/L. Its solubility product is:

• 6y⁴

• 36y⁴

• 64y⁵

• 108y⁵

The hybridisation of C₂ and C₃ of H₃C-CH=C=CH-CH₃ are:

• sp , sp³

• sp² , sp

• sp² , sp²

• sp , sp

The ease of nitration of the following three hydrocarbons follows the order:

• II = III = I

• II > III > I

• III > II > I

• I = III > II

Among the alkenes which one produces tertiary butyl alcohol on acid hydration?

• CH₃-CH₂-CH=CH₂

• CH₃-CH=CH-CH₃

• (CH₃)₂C=CH₂

• CH₃-CH=CH₂

Which one of the following will show optical isomerism?

• OH-CH₂-CO₂H

• CH₃-CH(OH)-CO₂H

• (CH₃)₂-CH-CO₂H

• (CH₃)₂-C(Cl)-CO₂H

20.

The ozone layer forms naturally by :

• the interaction of CFC with oxygen

• the interaction of UV radiation with oxygen

• the interaction of IR radiation with oxygen

• the interaction of oxygen and water vapour