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Ans- 1. Sodium oxide
An alkali also can be defined as a base that dissolves in water.
An alkali which completely dissociates into ions is lithium hydroxide.
Sodium oxide reacts exothermically with cold water to produce sodium hydroxide solution. Depending on its concentration, this will have a pH around 14. As a strong base, sodium oxide also reacts with acids.
Ans- 2. 1 J
Food chain has tropic levels. Transfer of energy through this food chain occur, with only 10% passage of energy. This means 90% of energy is waste on tropic levels.
Sequence :-
Producer
primary consumer
secondary consumer
tertiary consumer
So,
energy from producer to primary
100× 10 / 100
= 10J
means 10 J out of 100 J reaches to primary
energy from primary to secondary
10×10 / 100
= 1 J
Means 1J will be reach to secondary.
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