MCQ of chemistry(solve)

 Tick mark (✓) the correct choice

1).The region of the atmosphere nearest to the earth is
a.Stratosphere          b.Mesosphere
c.Troposphere           d.Thermosphere

2).The Ozone in the stratosphere is destroyed by
 a.•Cl                            b.•OH
  c.•H                            d.•ClO

3).The gases that give rise to photochemical smog are
a.Oxides of sulphur
b.Oxides of nitrogen
c.Oxides of carbon
d.Oxides of oxygen

4).The smog is essentially caused by the presence of
a . Oxygen and Ozone
b. Ozone and nitrogen
c. Oxides of sulphur and nitrogen
d. Oxygen and nitrogen

5).The gas of vital importance to all living organisms present in the stratosphere is
a.Oxygen              b.nitrogen
c.Ozone                d.carbon dioxide

6).The gas that contributes the most to the greenhouse effect is
a.methane             b.water  vapour
c.ozone                 d.carbon dioxide

7). Which of the following is a measure of organic pollution of water?
a.DO                        b.BOD
c.COD                      d.All of these 

8).The use of DDT has been banned in many countries because it is
a.not soluble in water
b.nonbiodegradable
c.A chlorine compound
d.An insecticide

9).The particulate that leads to stippled red blood cells.
a.iron                    b.mercury
c.lead                    d.chromium

10).The number of sigma and pi bonds in but-1-ene-3-yne is
a.5 and 5                  b.7 and 3
c.8 and 2                  d.6 and 2

Answer:1).c 
Answer:2).a
Answer:3).b
Answer:4).c
Answer:5).c
Answer:6).d
Answer:7).b
Answer:8).b
Answer:9).c
Answer:10).b

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