Ncert Solutions Chemistry Class 12th

A hard substance melts at high temperature and is an insulator in both solid and in molten state. This solid is most likely to be a/ an:

In basic medium H?O? exhibits which of the following reactions?
(A) Mn²? → Mn?
(B) I? → I?
(C) PbS → PbSO?
Choose the most appropriate answer from the options given below:

Given below are two statements:
Statement I: C?H?OH and AgCN both can generate nucleophile.
Statement II: KCN and AgCN both will generate nitrile nucleophile with all reaction conditions.
Choose the most appropriate option:

2 molal solution of a weak acid HA has a freezing point of 3.885°C. The degree of dissociation of this acid is _____ * 10?³. (Round off to the nearest integer).
[ Given : Molal depression constant of water = 1.85 K kg mol?¹, Freezing point of pure water = 0°C]

2NO(g) + Cl?(g) ? 2NOCl(s)
This reaction was studied at -10°C and the following data was obtained

[NO]? and [Cl?]? are the initial concentrations and r? is the initial reaction rate. The overall order of the reaction is _____. (Round off to the nearest integer).

In order to prepare a buffer solution of pH 5.74, sodium acetate is added to acetic acid. If the concentration of acetic acid in the buffer is 1.0 M, the concentration of sodium acetate in the buffer is _____ M. (Round off to the nearest integer).
[Given: pKa (acetic acid) = 4.74]

In a binary compound, atoms of element A form a hcp structure and those of element M occupy 2/3 of the tetrahedral voids of the hcp structure. The formula of the binary compound is:

In a binary compound, atoms of element A form a hcp structure and those of element M occupy 2/3 of the tetrahedral voids of the hcp structure. The formula of the binary compound is:

The correct structures of trans-[NiBr?(PPh?)?] and meridional-[Co(NH?)?(NO?)?], respectively, are: