Na (sodium) possesses all the above properties. It is too soft and can be cut with a knife. Na is a highly exothermic reaction producing a lot of heat. It also reacts with water and burns due to the ...

The angle of refraction must be less than the angle of incidence. While angle of emergence is equal to angle of incidence.

At night, when there is no sunlight, transpiration is very low but the absorption of substances by roots is high.

Cloudy days will cause the rate of photosynthesis to decrease due to the low availability of Sunlight.

No reaction take place as zinc is less reactive than aluminium and cannot displace aluminium from its salt solution Al₂(SO₄)₃.