Top 1000+ Solved Chemistry MCQ Questions Answer
Q. Methanol cannot be dried with anhydrous CaCl2 because -
a. CaCl2 dissolves in it
b. it is not good dehydrating agent
c. it forms a solid CaCl2 × 4CH3OH
d. it reacts with CH3OH
Q. Acid rain is caused by the pollution of environment by –
a. Carbon monoxide and Carbon dioxide
b. Ozone and Carbon dioxide
c. Nitrous oxide and Sulphur dioxide
d. Carbon dioxide and Nitrogen
Q. What are the components responsible for acid rain?
a. Nitrogen monoxide (NO) and Carbon monoxide (CO)
b. Sulphur dioxide (SO2) and Nitrogen oxides (NOx)
c. Carbon dioxide (CO2) and Carbon monoxide (CO)
d. Oxides of carbon (COx) and Oxides of nitrogen (NOx)
Q. Synthetic detergents are made from –
a. Sodium stearate
b. Sodium salt of benzene sulphonic acid
c. Sodium salt of benzene carboxylic acid
d. Sodium palmitate
Q. The open "Sigrees” or coal stoves often require fanning to sustain burning because of
a. tendency of carbon dioxide to form a layer along with dust smoke
b. lack of oxygen in the surroundings of sigrees
c. accumulation of smoke and dust over the sigrees
d. interrupted release of moisture from the material
Q. Antacid tablets consist of –
a. Hydroxides of sodium, magnesium and aluminium
b. Hydroxides of magnesium and aluminium
c. Hydroxides of sodium and aluminium
d. Hydroxides of magnesium and sodium
Q. Acid rain is caused by the pollution of environment by -
a. carbon dioxide and nitrogen
b. carbón monoxide and carbon dioxide
c. ozone and carbon dioxide
d. nitrous oxide and sulphur dioxide
Q. Synthetic detergents are prepared from
a. potassium salts of higher fatty-acids
b. sodium salts of higher fat acids
c. hydrocarbons of petroleum
d. glycerides
Q. Metals have .
a. High melting and boiling point
b. Low melting and boiling point
c. High melting and low boiling point
d. Low melting and high boiling point
Q. Soap helps in better cleaning of clothes because -
a. Soap acts like catalyst
b. It reduces the surface tension of solution
c. It gives strength to solution
d. It absorbs the dirt
Q. Acid rain is caused by, the pollution of environment by -
a. carbon dioxide and nitrogen
b. carbon monoxide and carbon dioxide
c. ozone and carbon dioxide
d. nitrous oxide and sulphur dioxide
Q. The enormous amount of energy released in an explosion of an atomic bomb is due to the -
a. conversion of mass into energy
b. conversion of chemical energy into heat energy
c. conversion of mechnical energy into nuclear energy
d. conversion of neutrons into protons
Q. Organic food is supposed to be better for human consumption because –
a. It is grown in glass house air tight environment
b. It is grown without the use of chemicals & synthetic pesticides
c. It depends on chemicals & fertilizers
d. It is too expensive to buy
Q. Nitrogen fixation is a process of -
a. Assimilation of nitrate
b. Utilisation of nitrogen gas
c. Conversion of organic nitrogen to proteins
d. Conversion of molecular nitrogen to ammonia
Q. What are soaps?
a. Salts of silicates
b. Ester of heavy fatty acids
c. Sodium or potassium salts of heavier fatty acids
d. Mixture of glycerol and alcohol