Question

Q-6
Do as directed.
(1) Explain-Threshing
(2) Which part of the flame does goldsmith use to make jewellery? Why?
(3) Why is phosphorus kept in water?
(4) How is sex determined of a foetus?
(5) Write a short note : Cell nucleus.
Q-7 (A) Do as directed.
(A)Explain the process of casting iron nails in solution of CuS04. (including chemical equation
(B) Which product is formed from the below given process. Show the process through the
chemical equation.
(1) Sulphur dioxide + water​

Answer 1

Answer:

Answer: 1) Threshing-The process of removing chaf from crops. 2) Goldsmith uses outermost layer of candle to make jewellery because it is the hottest part of the flame. 3)It is stored in water to prevent exposure from air because it spontaneously ignite at the temperature of 30°.