11.

The ground state magnetic property of B₂ and C₂ molecules will be

• B₂ paramagnetic and C₂ diamagnetic

• B₂ diamagnetic and C₂ paramagnetic

• Both are diamagnetic

• Both are paramagnetic

Which of the following atoms should have the highest I^st electron affinity?

• F

• O

• N

• C

PbCl₂ is insoluble in cold water. Addition of HCl increases its solubility due to

• formation of soluble complex anions like [PbCl₃]^-

• oxidation of Pb(II) to PB(IV)

• formation of [Pb(H₂O)₆]²⁺

• formation of polymeric lead complexes

Of the following compounds, which one is the strongest Bronsted acid in a aqueous solution?

• HClO₃

• HClO₂

• HOCl

• HOBr

The yield of acetanilide in the reaction (100% conversion) of 2 moles of aniline with 1 mole of acetic anhydride is

• 270 gm

• 135 gm

• 67.5 gm

• 177 gm

You are supplied with 500 mL each of 2N HCl and SN HCL What is the maximum volume of 3M HCl that you can prepare using only these two solutions?

• 250 mL

• 500 mL

• 750 mL

• 1000 mL

Which one of the following corresponds to a photon of highest energy?

• λ = 300 mm

• v = 3 × 10⁸ s^-1

• $\overline{\mathrm{v}}$ = 30 cm^-1

• ε = 6.626 × 10^-27 J

Equilibrium constants for the following reactions at 1200 K are given

2H₂O (g) $\rightleftharpoons$ 2H₂ (g) + O₂ (g)    [K₁ = 6.8 × 10^-8]

2CO₂ (g) $\rightleftharpoons$ 2CO (g) + O₂ (g)    [K₂ = 1.6 × 10^-6]

The equilibrium constant for the reaction?

H₂(g) + CO₂(g) $\rightleftharpoons$ CO (g) + H₂O (g)

at 1200 K will be

• 0.05

• 20

• 0.2

• 5.0

Which of the following solutions will turn violet when a drop of lime juice is added to it?

• A solution of NaI

• A solution mixture of KI and NaIO₃

• A solution mixture of NaI and KI

• A solution mixture of KIO₃ and NaIO₃

What will be the normality of the salt solution obtained by neutralising x mL y (N) HCl with y mL x(N) NaOH, and finally adding (x + y) mL distilled water

• $\frac{2(\mathrm{x} + \mathrm{y})}{\mathrm{xy}} \mathrm{N}$

• $\frac{\mathrm{xy}}{2(\mathrm{x} + \mathrm{y})}\mathrm{N}$

• $\left(\frac{2\mathrm{xy}}{\mathrm{x} + \mathrm{y}}\right) \mathrm{N}$

• $\left(\frac{\mathrm{x} + \mathrm{y}}{\mathrm{xy}}\right)\mathrm{N}$