11.

The type of hybridisation in SF₆, molecule is

• sp³d

• dsp³

• sp³d

• d²sp³

Among LiCl, BeCl₂, BCl₃ and CCl₄ the covalent bond character follows the order

• LiCl < BeCl₂ < BCl₃ < CCl₄

• BCl₃ < CCl₄ < BeCl₂ < LiCl

• BeCl₂ < LiCl < CCl₄ < BCl₃

• CCl₄ < BCl₃ < BeCl₂ < LiCl

Maximum number of electrons in a subshell of an atom determined by the following?

• 4l + 2

• 2n²

• 4l - 2

• 2l + 1

pK_a of acetic acid and pK_b of ammonium hydroxide are 4.76 and 4.75 respectively. Calculate the pH of ammonium acetate solution.

• 6.02

• 7.005

• 8

• 5.602

The value of K_c for the reaction,

2A  B + C is 2 x 10^-3. At a given time, if the composition of reaction mixture is [A] = [B] = [C] = 3 x 10^-3 M. Which is true?

• The reaction will proceed in forward direction

• The reaction will proceed in backward direction

• The reaction will proceed in any direction

• None of the above

The above reaction is known as

• aromatisation

• pyrolysis

• isomerisation

• oxidation

Number of hydrogen-bonded water molecules associated in CuSO₄.5H₂O is

• one

• two

• three

• All the five

Which of the following species do not show disproportionation on reaction?

ClO^-, Cl${\mathrm{O}}_2^{-}$ , Cl${\mathrm{O}}_3^{-}$ and Cl${\mathrm{O}}_4^{-}$

• Cl${\mathrm{O}}_4^{-}$

• Cl${\mathrm{O}}_4^{-}$

• ClO^-

• None of these

During estimation ofnitrogen in the organic compound by Kjeldahl's method, the ammonia evolved from 0.5 g of the compound in Kjeldahl's estimation of nitrogen, neutralised 10 mL of 1M H₂SO_4^. Find out the percentage of nitrogen in the compound.

• 14%

• 28%

• 56%

• 68%

On addition of conc. H₂SO₄ to a chloride salt, colourless fumes are evolved but in case of iodide salt, violet fumes come out. This is because

• H₂SO₄ reduces HI to I₂

• HI is of violet colour

• HI gets oxidised to I₂

• HI changes to HIO₃