41.

Assertion : Sb (II) is not precipitated as sulphide when in its alkaline solution H₂S is passed.

Reason : The concentration of S^2- ion in alkaline medium is inadequate for precipitation.

• If both assertion and reason are true and reason is the correct explanation of assertion

• If both assertion and reason are true but reason is not the correct explanation of assertion

• If assertion is true but reason is false

• If both assertion and reason are false.

Assertion : Aqueous gold colloidal solution is red in colour.

Reason : The colour arises due to scattering of light by colloidal gold articles.

• If both assertion and reason are true and reason is the correct explanation of assertion

• If both assertion and reason are true but reason is not the correct explanation of assertion

• If assertion is true but reason is false

• If both assertion and reason are false.

Assertion : Copper metal gets readily corroded is an acidic aqueous solution.

Reason : Free energy change for this process is positive.

• If both assertion and reason are true and reason is the correct explanation of assertion

• If both assertion and reason are true but reason is not the correct explanation of assertion

• If assertion is true but reason is false

• If both assertion and reason are false.

Assertion : Addition of silver ions to a mixture of aqueous sodium chloride and sodium bromide solution will first precipitate AgBr rather than AgCl.

Reason : K_sp of AgCl < K_sp of AgBr.

• If both assertion and reason are true and reason is the correct explanation of assertion

• If both assertion and reason are true but reason is not the correct explanation of assertion

• If assertion is true but reason is false

• If both assertion and reason are false.

Among the following the dissociation constant is highest for

• C₆H₅OH

• C₆H₅CH₂OH

• CH₃C$\equiv$CH

• CH₃NH₃⁺Cl

The reagent used for the separation of acetaldehyde from acetophenone is

• NaHSO₃

• C₆H₅NHNH₂

• NH₂OH

• NaOH-I₂

Among the following the most reactive towards alcoholic KOH is

• CH₂=CHBr

• CH₃COCH₂CH₂Br

• CH₃CH₂Br

• CH₃CH₂CH₂Br

Among the following, the one which reacts most readily with ethanol is

• p-nitrobenzyl bromide

• p-chlorobenzyl bromide

• p-methoxybenzyl bromide

• p-methylbenzyl bromide.

The nucleic acid base having two possible binding sites is

• thymine

• cytosine

• guanine

• adenine.

o-Toluic acid on reaction with Br₂+ Fe gives