CCl
का अवयवी कण है
(a) आयन
(c) परमाणु
(b) अणु
(d) इनमें से कोई नहीं
Answers
Step-by-step explanation:
(ii) Write one use of washing powder.
Q.12. (a) Write the name given to bases that are highly soluble in water. Give an
example.
(b) How is tooth decay related to pH?
Q.13. Write a balanced chemical equation for process of photosynthesis. Name the
type of this chemical reaction.
Q.14. What is a redox reaction? When a magnesium ribbon burns in air with a
dazzling flame and forms a white ash, is magnesium oxidised or reduced? Why?
Q.15. Write any two observations in an activity which may suggest that a chemical
reaction has taken place. Give an example in support of your answer.
Q.16. What do you mean by exothermic and endothermic reactions? Give one
example of each type.
Section -III
Q.17. A white powder is added while baking breads and cakes to make them soft and
fluffy. Write the name of the powder. Name its main ingredients. Explain the function
of each ingredient. Write the chemical reaction taking place when the powder is
heated durQ.18. (i) Dry pellets of a base ‘X’ when kept in bpen absorbs moisture and turns
sticky. The compound is also formed by chlor-alkali process. Write chemical name
and formula of X. Describe chlor-alkali process with balanced chemical equation.
Name the type of reaction occurs when X is treated with dilute hydrochloric acid.
Write the chemical equation.
(ii) While diluting an acid, why is it recommended that the acid should be added to
water and not water to the acid?
Section- IV
Q.19. Write balanced chemical equations for the following statements:
(i) NaOH solution