21.

The molar conductivities of KCl, NaCl and KNO₃ are 152, 128 and 111 S cm²mol^-1 respectively. What is the molar conductivity of NaNO₃?

• 101 S cm²mol^-1 

• 87 S cm²mol^-1 

• -101 S cm²mol^-1 

• -39 S cm²mol^-1 

The electrochemical cell stops working after sometime because

• electrode potential of both the electrodes becomes zero

• electrode potential of both the electrodes becomes equal

• one of the electrodes is eaten away

• the cell reaction gets reversed

The amount of electricity required to produce one mole of copper from copper sulphate solution will be

• 1 F

• 2.33 F

• 2 F

• 1.33 F

Dipping iron article into a strongly alkaline solution of sodium phosphate

• does not affect the article

• $\mathrm{Fr}o\mathrm{m} {\mathrm{Fe}}_2{\mathrm{O}}_3·{\mathrm{xH}}_2\mathrm{O} \mathrm{on} \mathrm{the} \mathrm{surface}$

• forms iron phosphate film

• forms ferric hydroxide

When acetamide is hydrolysed by boiling with acid, the product obtained is

• acetic acid

• ethyl amine

• ethanol

• acetamide

Which will not go for diazotisation?

• C₆H₅NH₂

• C₆H₅CH₂NH₂

• 

• 

Secondary nitroalkanes can be converted into ketones by using Y. Identify Y from the following

• aqueous HCl

• aqueous NaOH

• KMnO₄

• CO

Alkyl cyanides undergo Stephen reduction to produce

• aldehyde

• secondary amine

• primary amine

• amide

Milk changes after digestion into

• cellulose

• fructose

• glucose

• lactose

Which of the following set consists only of essential amino adds?

• Alanine, tyrosine, cystine

• Leucine, lysine, tryptophane

• Alanine, glutamine, lycine

• leucine, praline, glycine