Which of the following is a balanced equation?
H2 + 2O2 → 2H2O
2H2 + O2 → H2O
H2 + O2 → H2O
2H2 + O2 → 2H2O
Water produces hydrogen and oxygen in the ratio of:
1 : 1
2 : 1
1 : 2
2 : 3
Specific heat of water is:
very high
very low
medium
sometimes high and sometimes low
The process of breaking down of a compound of passing electric current through it is called:
hydrolysis
photosynthesis
electrolysis
distillation
Our body temperature is maintained at:
20oC
41oC
37oC
11oC
Impurities in water:
Lower the freezing point
increase the boiling point
none of these
both of these
Ice floats on water because
ice is heavier than water
ice is cooler than water
ice is lighter than water
ice is a solid
When water is cooled it contracts until it reaches ______ and then it starts expanding.
40oC
0oC
4oC
The earth appears blue from outer space because:
of the forests
of the sky
of the water
all of these
The melting point of ice is:
32oC
100oC
