Top 1000+ Solved Chemistry MCQ Questions Answer
Q. The molecular mass of a has is –
a. twice its vapour pressure
b. equal to its vapour pressure
c. half its vapour pressure
d. not related to its vapour pressure
Q. Carbon footprint can be reduced by –
a. All of these
b. Recycling waste materials
c. Using energy efficient appliances
d. Commuting by public transport
Q. Thermal electricity is generated by using which of these?
a. Coal only
b. Coal and Natural Gas only
c. Coal, Natural Gas and Petroleum
d. None of these
Q. The mass number of a nucleus is –
a. always less than its atomic number
b. always more than its atomic number
c. always equal to its atomic number
d. sometimes more - and somtimes equal to its atomic number
Q. Ionisation energy of nitrogen is greater than that of oxygen because nitrogen has –
a. high bond dissociation energy
b. smaller atomic radius
c. stable half filled 2p sub level
d. high nuclear charge
Q. Graphite is used in nuclear reactors for-
a. reducing the speed of fast neutrons
b. cooling the reactor
c. absorbing neutrons
d. None of the above
Q. Bleaching powder is prepared by passing –
a. Chlorine over slaked lime
b. Oxygen over slaked lime
c. Carbon dioxide over slaked lime
d. Chlorine over quick lirne
Q. Acid rain is caused due to pollution of atmosphere by –
a. oxides of carbon and nitrogen
b. oxides of nitrogen and sulphur
c. oxides of nitrogen and phosphorus
d. None of these
Q. The working of a dry cell is based on -
a. Decomposition reaction
b. Spontaneous oxidation-reduction reaction
c. Combination reaction.
d. Electrolysis
Q. Which of the following is the correct sequence of countries in terms of maximum carbon dioxide emission?
a. China, USA, European Union, India
b. USA, India, China, European Union
c. China, India, European Union, USA
d. (4) European Union, China, USA, India
Q. Potassium Permanganate is used for purifying drinking water, because .
a. It is a reducing agent
b. It is an oxidising agent
c. It is a sterilising agent
d. It dissolves the impurities of water
Q. Oxide of sulphur present in the atmosphere are washed down by rains to cause –
a. Depletion of fossil fuel reserves
b. Eutrophication in lakes
c. Lowering of pH of soil
d. Industrial smog formation
Q. An emulsifier is an agent which –
a. stabilises an emulsion
b. aids the flocculation of an emulsion
c. accelerates the dispersion
d. homogenises an emulsion
Q. Air is said to be saturated when -
a. it contains maximum content of water vapour
b. its pressure is minimum
c. its thickness is maximum
d. it blows over the barren land
Q. Which one of the following group of gases contribute to the "Green House Effect"?
a. Carbon dioxide and Methane
b. Ammonia and Ozone
c. Carbon monoxide and Sulphur dioxide
d. Carbon tetrailouride and Nitrous oxide