4. Cool air from sea move towards to land is _____ . 5. ______ colour is absorber as well as radiator. 6. The pores surrounded by guard cells on the surface of leaves are called ____ . 7. The solution which do not show the effect of acid as well as base is called ____ . 8. Hot water rises up and cold water moves down towards the heat is the process of ____ . 9. When solution is basic, phenolphthalein gives a ____ colour. 10. In neutralisation reaction, a new substance is formed called ____.
Answers
Explanation:
Multiple Choice Questions
1. (d) 2. (c)
3. (c) Hint— The substance which oxidises the other substances in
a chemical reaction is known as an oxidising agent. Likewise, the
substance which reduces the other substance in a chemical
reaction is known as reducing agent.
4. (a) 5. (c) 6. (a) 7. (b)
8. (a) 9. (b) 10. (d) 11. (b)
12. (d)
13. (b) Hint— Lead sulphate being insoluble will not dissociate into
Pb2+ ions.
14. (d) 15. (a) 16. (d) 17. (d)
18. (d)
Short Answer Questions
19. (a) N2
(g) + 3H2
(g) Catalyst
773 K → 2NH3
(g)
Combination reaction
(b) NaOH(aq) + CH3COOH(aq) → CH3COONa(aq) + H2O(l)
Double displacement reaction/Neutralisation reaction
(c) C2H5OH(l) + CH3COOH(l) H+
→ CH3COOC2H5
(l) + H2O(l)
Double displacement reaction/Esterificaton reaction
(d) C2H4
(g) + 3O2
(g) → 2CO2
(g) + 2H2O(g) + Heat + Light
Redox reaction/Combustion reaction20. (a) Fe2O3
(s) + 2Al(s) → Al2O3
(s) + 2Fe(l) + Heat
Displacement reaction/Redox reaction
(b) 3Mg(s) + N2
(g) → Mg3N2
(s)
Combination reaction
(c) 2KI(aq) +Cl2
(g) → 2KCl(aq) + I2
(s)
Displacement reaction
(d) C2H5OH(l) + 3O2
(g) → 2CO2
(g) + 3H2O(l) + Heat
Redox reaction/Combustion reaction
21. (a) x → (s)
y → (aq)
(b) x → 2 Ag
(c) x → (aq)
y → (g)
(d) x → Heat
22. (b) and (c) are exothermic as heat is released in these changes.
(a) and (d) are endothermic as heat is absorbed in these changes
23. (a) Ammonia (NH3
)
(b) Water (H2O) as F2
is getting reduced to HF
(c) Carbon monoxide (CO)
(d) Hydrogen
Hint—Reducing agents are those substances which have the
ability of adding hydrogen or removing oxygen from the other
substances.
24. (a) Pb3O4
(b) O2
(c) CuSO4
(d) V2O5
(e) H2O
(f) CuO
25. (a) Na2CO3
+ HCl → NaCl + NaHCO3
(b) NaHCO3
+ HCl → NaCl + H2O + CO2
(c) 2CuSO4
+ 4KI → Cu2
I
2
+ 2K2SO4
+ I2
26. KCl (aq) + AgNO3
(aq) → AgCl (s) + KNO3
(aq)
It is a double displacement and precipitation reaction.
Answer:
4. land breeze
5. black
6. stomata
9. pink
10. salt