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1. The part of the earth and thin layer of air above its surface, which support life on earth, are referred to as
a) mesosphere
b) stratosphere
c) biosphere
d) ionosphere

2. The reaction between compounds and oxygen is called
a) oxidation
b) carbonation
c) hydrolysis
d) solution

3. The unit of current is
a) ohm
b) watt
c) ampere
d) none of the above

4. Joule is the unit of
a) temperature
b) pressure
c) energy
d) heat

5. Type or Copy and paste the Question
a) NA
b) NA
c) NA
d) NA



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