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

What is the effect of Frenkel defect on the density of ionic solids?

In a Schottky defect ____________.

Which of the following aqueous solutions should have the highest boiling point?

\[\ce{CH3CH2CH2Br + NaCN -> CH3CH2CH2CN + NaBr}\], will be fastest in:

A dihalogen derivative ‘X’ of a hydrocarbon with three carbon atoms react with ale. KOH and produces hydrocarbon which forms red ppt. with ammonical Cu₂Cl₂. ‘X’ gives an aldehyde on reaction with aq. KOH. The compound ‘X’ is:

Which of the following has the lowest boiling point?

Major product obtained on reaction of 3-Phenyl propene with HBr in presence of organic peroxide.

Cations are present in the interstitial sites in ______.

Schottky defect is observed in crystals when ______.

Which of the following point defects are shown by AgBr(s) crystals?

1. Schottky defect
2. Frenkel defect
3. Metal excess defect
4. Metal deficiency defect

Which of the following defects is also known as dislocation defect?

Which of the following statements are not true?

(i) Vacancy defect results in a decrease in the density of the substance.

(ii) Interstitial defects results in an increase in the density of the substance.

(iii) Impurity defect has no effect on the density of the substance.

(iv) Frankel defect results in an increase in the density of the substance.

Frenkel defect is also known as:

(i) stoichiometric defect

(ii) dislocation defect

(iii) impurity defect

(iv) non-stoichiometric defect

Which of the following defects decrease the density?

(i) Interstitial defect

(ii) Vacancy defect

(iii) Frankel defect

(iv) Schottky defect

Why is FeO (s) not formed in stoichiometric composition?

Match the defects given in Column I with the statements in given Column II.

The unit of ebulioscopic constant is ______.

Explain why on addition of 1 mol of NaCl to 1 litre of water, the boiling point of water increases, while addition of 1 mol of methyl alcohol to one litre of water decreases its boiling point.

Why is it not possible to obtain pure ethanol by fractional distillation? What general name is given to binary mixtures which show deviation from Raoult’s law and whose components cannot be separated by fractional distillation. How many types of such mixtures are there?

While charging the lead storage battery ______.