Question

16. Name the chemical reaction along with example:-
a) reaction in which more than one product is obtained from single reactant
b) reaction between an acid and a base
17. The distance from Mumbai to Delhi is 350 km. A bus travels at an average speed
of 50 km/h. How much time would it take to travel from Mumbai to Delhi?
Section - C
18. How are the shapes of crowns of trees, and their location on earth, related to
each other?
19. What are the causes that lead to a decrease in groundwater level?
20. Give reasons for the following:
a) The bottoms of cooking utensils are often kept black.
b) We prefer white or light coloured clothes in summers.
c) A new quilt is warmer than an old one.
21. Explain the various processes involved in nutrition in ruminant animals.

Answer 1

• $\huge\red{\mid{\fbox{\tt(answer)}\mid}}$Mumbai receives rainfall in summer season by south west monsoon, which enters into India from western coast, where Mumbai liqs and gives it heavy rainfall but Chennai receives rainfall in the month of October to December by the retreating monsoon and the N.E. monsoon which come from north east direction.

Answer 2

Answer:

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Explanation:

1) Why should a magnesium ribbon be cleaned before it is burnt in air?

Ans: Magnesium is an very reactive metal. When stored, it reacts with oxygen to form a layer of magnesium oxide on its surface. This layer of magnesium oxide is quite stable and prevents further reaction of magnesium with oxygen. The magnesium ribbon is cleaned by sand paper for removing this layer so that the underlying metal can be exposed to air.