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

Mention the type of compounds formed when small atoms like H, C and N get trapped inside the crystal lattice of transition metals. Also give physical and chemical characteristics of these compounds.

Transition metals can act as catalysts because these can change their oxidation state. How does \[\ce{Fe(III)}\] catalyse the reaction between iodide and persulphate ions?

Mention any three processes where transition metals act as catalysts.

A violet compound of manganese (A) decomposes on heating to liberate oxygen and compounds (B) and (C) of manganese are formed. Compound (C) reacts with KOH in the presence of potassium nitrate to give compound (B). On heating compound (C) with conc. \[\ce{H2SO4}\] and \[\ce{NaCl}\], chlorine gas is liberated and a compound (D) of manganese along with other products is formed. Identify compounds A to D and also explain the reactions involved.

Write a test to detect the presence of double bond in a molecule.

Discuss the nature of C – X bond in the haloarenes.

Assertion: Nitration of chlorobenzene leads to the formation of m-nitrochlorobenzene.

Reason: –NO₂ group is a m-directing group.

What is the structure and IUPAC name of glycerol?

When phenol is treated with bromine water, white precipitate is obtained. Give the structure and the name of the compound formed.

Write the structures of the isomers of alcohols with molecular formula \[\ce{C4H10O}\]. Which of these exhibits optical activity?

Explain why is \[\ce{O = C =O}\] nonpolar while \[\ce{R - O - R}\] is polar.

Give the structure of the following compounds.

4-Nitropropiophenone

Give the structure of the following compounds.

2-Hydroxycyclopentanecarbaldehyde

Give the structure of the following compounds.

Phenyl acetaldehyde

Sucrose (cane sugar) is a disaccharide. One molecule of sucrose on hydrolysis gives ______.

Which of the following statements is not true about glucose?

Carbohydrates are classified on the basis of their behaviour on hydrolysis and also as reducing or non-reducing sugar. Sucrose is a: 

(i) monosaccharide

(ii) disaccharide

(iii) reducing sugar

(iv) non-reducing sugar

How do you explain the presence of all the six carbon atoms in glucose in a straight chain?

In nucleoside a base is attached at 1′ position of sugar moiety. Nucleotide is formed by linking of phosphoric acid unit to the sugar unit of nucleoside. At which position of sugar unit is the phosphoric acid linked in a nucleoside to give a nucleotide?

Under what conditions glucose is converted to gluconic and saccharic acid?