Ncert Solutions Chemistry Class 12th

Given are two statements one is labeled as Assertion A and other is labeled as Reason R.

 Assertion A : Magnesium can reduce Al₂O₃ at a temperature below 1350°C, while above 1350°C aluminium can reduce MgO

Reason R : The melting and boiling points of magnesium are lower thatn those of aluminium.

In light of the above statements, choose most appropriate answer for the options given below:

The Zeta potential is related to which property of colloids?

The incorrect statement about the imperfections in solids is:

Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R.

Assertion A : Dacron is an example of polyester polymer.

Reason R : Dacron is made up of ethylene glycol and terephthalic acid monomers.

In the light of the above statements, choose the most appropriate answer from the options given below.

In Friedel-Crafts alkylation of aniline, one gets

Two isomers (A) and (B) with molar mass 184 g/mol and elemental composition C, 52.2%; H. 4.9% and Br 42.9% gave benzoic acid and p-bromobenzoic acid respectively on oxidation with KMnO₄. Isomer 'A' is optically active and gives a pale yellow precipitate when warmed with alcoholic AgNO₃. Isomer 'A' and 'B' are respectively

Kindly consider the following

 

Sulphur dioxide is one of the components of polluted air. SO₂ is also a major contributor to acid rain. The correct and complete reaction to represent acid rain caused by SO₂ is

A 42.12% (w/v) solution of NaCl causes precipitation of a certain sol in 10 hours. The coagulating value of NaCl for the sol is

[Given molar mass : Na = 23.0g mol^-1; Cl = 35.5g mol^-1]