Ncert Solutions Chemistry Class 12th

Which of the reaction is suitable for concentrating ore by leaching process?

Given below are two statements.

Statement I: Stannane is an example of a molecular hydride.

Statement II: Stannane is a planar molecule.

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

In liquation process used for tin (Sn), the metal

Given below are the critical temperature of some of the gases:

The gas showing least adsorption on a definite amount of charcoal is

Given below are the critical temperature of some of the gases:

The gas showing least adsorption on a definite amount of charcoal is

Match List-I with List-II

           Choose the correct answer from the options given below

The number of stereoisomers formed in a reaction of

$\left(\pm \right)Ph\left(C=O\right)C\left(OH\right)\left(CN\right)PhwithHCNis\_\_\_\_\_\_\_\_\_\_\_\_.$            

A 1.84 mg sample of polyhydric alcoholic compound 'X' of molar mass 92.0 g/mol gave 1.344mL of H₂ gas at STP. The number of alcoholic hydrogens present in compound 'X' is_________.

Consider the following sulphur based oxoacids.

H₂SO₃, H₂SO₄, H₂S₂O₈ and H₂S₂O₇.

Amongst these oxoacids, the number of those with peroxo (O-O) bond is______________.

Assuming 1 $\mu g$ of trace radioactive element X with a half life of 30 years is absorbed by a growing tree. The amount of X remaining in the tree after 100 years is __________* 10^-1 $\mu g$  

[Given: In 10 = 2.303; log 2 = 0.30]