Question

13. State the following laws of chemical combinat
give one example in each case
(i) Law of constant composition.
(ii) Law of multiple proportions.
14. What do you understand by a balanced c
equation ? What quantitative information
balanced chemical equation convey ?
15. Explain (i) molarity (ii) limiting reagent.
16. Write the balanced chemical equations
following reactions :
(i) Manganese dioxide and concentrated hyd
acid.
(ii) Sodium thiosulphate and iodine.
(iii) Copper and dilute nitric acid.
(iv) Sulphur dioxide and hydrogen sulphid
17. Write the empirical formulae of the co
having the following molecular formulae :
(i) C&H. (ii) C&H 2 (ii) H,O, (iv) H,
(v) Na,Co, (vi) B.H. (vii) N,O
18. Balance the following equations :
(i) HPO4 + HKPO, + PH
- (ii) Ca +,0 - Ca(OH), + H,
(iii) Fe (SO )2 + NH, +H,0 Fe(OH), +
19. What do you understand by the term form
How does it differ from molecular mass ?
20. Which of the following has (i) 1
(ii) minimum mass ?

answer all questions​

Answer 1

Answer:

The law of constant composition says that, in any particular chemical compound, all samples of that compound will be made up of the same elements in the same proportion or ratio. For example, any water molecule is always made up of two hydrogen atoms and one oxygen atom in a 2:12:1 ratio.

Law of multiple proportions, states that when two elements combine with each other to form more than one compound the weights of one element that combine with a fixed weight of the other are in a ratio of small whole numbers. For example, there are five distinct oxides of nitrogen, and the weights of oxygen in combination with 14 grams of nitrogen are, in increasing order, 8, 16, 24, 32, and 40 grams, or in a ratio of 1, 2, 3, 4, 5.  

Explanation: