Some Chemical Reactions MCQs with Answers

When ethyl alcohol is produced by fermentation process, the gas which escapes in the form of bubbles is ?

• A.Oxygen
• B.Nitrogen
• C.Hydrogen
• D.Carbon dioxide

In decarboxylation of carboxylic acids, which reagent is used?

• A.Soda lime
• B.Zinc dust
• C.Sodium borohydride
• D.Lithium aluminium hydride

Grignard's reagent forms carboxylic acid when it reacts with?

• A.CO₂
• B.H₂O
• C.NH₃
• D.O₂

If residual silver halide is not removed before exposure to radiation the image will darken. The process of removing residual silver halide from the image is called ?

• A.Fixing
• B.Developing
• C.Bleaching
• D.Toning

Which bond is present in monosaccharides?

• A.Phosphodiester bond
• B.Peptide bond
• C.Hydrogen bond
• D.Glycosidic bond

The order of decomposition of Nitrogen pentoxide: 2N₂O₅ → 2N₂O₄ + O₂ is:

• A.Zero order
• B.Second order
• C.First order
• D.Third order

If smoking is coming out of the kitchen, what is the reason?

• A.Water
• B.Steam
• C.Fire
• D.Dust

Identify the Lucas reagent among the following?

• A.Conc. HCl & Anhydrous AlCl₃
• B.Conc. H₂SO₄ & Anhydrous ZnCl₂
• C.Conc. HNO₃ & Anhydrous AlCl₃
• D.Conc. HCl & Anhydrous ZnCl₂

Which property makes water known as the universal solvent?

• A.It has a high boiling point
• B.It dissolves more substances than any other liquid
• C.It is found in all three states of matter
• D.It has a high specific heat capacity

Which of the following salts is the main cause of permanent hardness of water?

• A.Calcium bicarbonate
• B.Magnesium sulphate
• C.Sodium chloride
• D.Potassium nitrate