Question

please tell amswer of this!​

Answer 1

Answer:

11.

1. Carbon, Hydrogen and Oxygen

2. Nitrogen, hydrogen

3. Calcium, Carbon and Oxygen

4. Sodium, Carbon, Oxygen

12.

Compounds Elements Proportion of elements

(a) H 2 O Hydrogen : Oxygen 1 : 8

(b) CO2 Carbon : Oxygen 3 : 8

(c) CaO Calcium : Oxygen 5 : 2

(d) NO2 Nitrogen : Oxygen 7 : 16

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