The United States of America has a prominent two-party system, dominated by the Democratic and Republican parties. This system fosters political stability but limits diverse representation.
Which part of the human brain is responsible for:
(a) thinking
(b) picking up a pencil
(c) controlling blood pressure
(d) controlling hunger
Common salt is a very important chemical compound for our daily life. It’s chemical name is sodium chloride and it is used as a raw material in the manufacture of caustic soda, washing soda, baking soda etc. It is also used in the preservation of pickles, butter, meat etc.
(i) Name the acid and the base from which common salt can be obtained.
(ii) State the nature (acidic/basic/neutral) of sodium chloride. Give reason for the justification for your answer.
(iii) (A) What happens when electric current is passed through an aqueous solution of sodium chloride (called brine)?
Name the products obtained along with the corresponding places in the electrolytic cell where each of these products is obtained.
Draw a ray diagram to show the formation of a rainbow. Mark on it, points (a), (b) and (c) as given below:
(a) Where dispersion of light occurs.
(b) Where light gets reflected internally.
(c) Where final refraction occurs.