A radioactive atom ${}_{\mathrm{Y}}{}^{\mathrm{X}}$M emits two a particles and one B 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

Which one of the following is paramagnetic?

• N₂

• NO

• CO

• O₃

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

• square planar geometry

• tetrahedral geometry

• trigonal bipyramidal geometry

• octahedral geometry

Which of the following is used to prepare Cl₂ gas at room temperature from concentrated HCl?

• MnO₂

• H₂S

• KMnO₄

• Cr₂O₃

The normality of 30 volume H₂O₂ is

• 2.678 N

• 5.336 N

• 8.034 N

• 6.685 N

A plot of ln K against $\frac{1}{\mathrm{T}}$ (abscissa) is expected to be a straight line with intercept on ordinate axis equal to

• $\frac{∆\mathrm{S}°}{2.303 \mathrm{R}}$

• $\frac{∆\mathrm{S}°}{\mathrm{R}}$

• $-\frac{∆\mathrm{S}°}{\mathrm{R}}$

• R × $∆\mathrm{S}°$

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

• 6y⁴

• 36y⁴

• 64y⁵

• 108y⁵

18.

Hybridisation of C₂ and C₃ of H₃C-CH=C-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