Science (English Medium) कक्षा १२ - CBSE Question Bank Solutions for Chemistry

Dehydration of 2-butanol yields:

Which of the following is not true in case of reaction with heated copper at 300°C?

Lucas test is done to differentiate between ____________.

Which one of the following on oxidation gives a ketone?

Primary and secondary alcohols on the action of reduced copper give:

The function of glucose is to ____________.

The compound which gives the most stable carbonium ion on dehydration is:

Cyclohexene is best prepared from cyclohexanol by which of the following:

During dehydration of alcohols to alkenes by heating with cone. H₂SO₄ the initial step is ____________.

\[\ce{CH3CH2OH}\] can be converted into \[\ce{CH3CHO}\] by ______.

What would be the reactant and reagent used to obtain 2, 4-dimethyl pentan-3-ol?

Identify the secondary alcohols from the following set:

1. \[\ce{CH3CH2CH(OH)CH3}\]
2. \[\ce{(C2H5)3COH}\]
3. 
   
4. 
   

Two beakers of capacity 500 mL were taken. One of these beakers, labelled as “A”, was filled with 400 mL water whereas the beaker labelled “B” was filled with 400 mL of 2 M solution of NaCl. At the same temperature both the beakers were placed in closed containers of same material and same capacity as shown in figure.

At a given temperature, which of the following statement is correct about the vapour pressure of pure water and that of NaCl solution.

For a binary ideal liquid solution, the variation in total vapour pressure versus composition of solution is given by which of the curves?

Why is the vapour pressure of an aqueous solution of glucose lower than that of water?

Which of the statements about solutions of electrolytes is not correct?

\[\ce{\Lambda^0_m(NH4OH)}\] is equal to ______.

\[\ce{Λ^0_m H2O}\] is equal to:

(i) \[\ce{Λ^0_m_{(HCl)} + \ce{Λ^0_m_{(NaOH)} - \ce{Λ^0_m_{(NaCl)}}}}\]

(ii) \[\ce{Λ^0_m_{(HNO_3)} + \ce{Λ^0_m_{(NaNO_3)} - \ce{Λ^0_m_{(NaOH)}}}}\]

(iii) \[\ce{Λ^0_{(HNO_3)} + \ce{Λ^0_m_{(NaOH)} - \ce{Λ^0_m_{(NaNO_3)}}}}\]

(iv) \[\ce{Λ^0_m_{(NH_4OH)} + \ce{Λ^0_m_{(HCl)} - \ce{Λ^0_m_{(NH_4Cl)}}}}\]

Molar conductivity of ionic solution depends on:

(i) temperature.

(ii) distance between electrodes.

(iii) concentration of electrolytes in solution.

(iv) surface area of electrodes.

Solutions of two electrolytes ‘A’ and ‘B’ are diluted. The Λ_m of ‘B’ increases 1.5 times while that of A increases 25 times. Which of the two is a strong electrolyte? Justify your answer.