11.

The most suitable reagent for the following conversion, is :

   

• H₂, Pd/C, quinoline

• Zn/HCl

• Hg²⁺/H⁺, H₂O

• Na/liquid NH₃

Which of the following reactions are disproportionation reaction?

(a) 2Cu⁺ → Cu²⁺ + Cu⁰

(b) 3MnO${}_4^{2-} + 4{\mathrm{H}}^{+} \to 2{\mathrm{MnO}}_4^{-} + {\mathrm{MnO}}_2 + 2{\mathrm{H}}_2\mathrm{O}$

(c) 2KMnO₄ $\stackrel{∆}{\to } {\mathrm{K}}_2{\mathrm{MnO}}_4 + {\mathrm{MnO}}_2 + {\mathrm{O}}_2$

(d) 2MnO${}_4^{-} + 3{\mathrm{Mn}}^{2+} + 2{\mathrm{H}}_2\mathrm{O} \to 5{\mathrm{MnO}}_2 + 4{\mathrm{H}}^{\oplus }$

Select the correct option from the following

• (a), (b) and (c)

• (a), (c) and (d)

• (a) and (d) only

• (a) and (b) only

For the second period elements the correct increasing order of first ionisation enthalpy is:

• Li < B < Be < C < O < N < F < Ne

• Li < B < Be < C < N < O < F < Ne

• Li < Be < B < C < O < N < F < Ne

• Li < Be < B < C < N < O < F < Ne

The number of sigma (σ) and pi (π) pent-2-en-4-yne is

• 8σ bonds and 5π bonds

• 11σ bonds and 2π bonds

• 13σ bonds and no π bonds

• 10σ bonds and 3π bonds

Among the following, the one that is not a green house gas is:

• Methane

• Ozone

• Sulphur dioxide

• Nitrous oxide

Which of the following is an amphoteric hydroxide?

• Ca(OH)₂

• Mg(OH)₂

• Be(OH)₂

• Sr(OH)₂

The method used to remove temporary hardness of water is :

• Clark's method

• Ion-exchange method

• Synthetic resins method

• Calgon's method

Among the following, the reaction that proceeds through an electrophilic substitution, is:

An alkene "A" on reaction with O₃ and Zn–H₂O gives propanone and ethanal in equimolar ratio. Addition of HCl to alkene "A" gives "B" as the major product. The structure of product "B" is:

• H₃C—CH₂—CH(CH₂Cl)—CH₃

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• 

• 

Enzymes that utilize ATP in phosphate transfer require an alkaline earth metal (M) as the cofactor. M is :

• Mg

• Ca

• Sr

• Be