10th class chemistry unit 7 MCQs
chapter 7 MCQs 10th Class Chemistry
Water:
1. The oceans contain about of total world’s water:
a. 95%
b. 91%
c. 97%
d. 93%
2. The boiling point of water is:
a. 800C
b. 00C
c. 1000C
d. 250C
3. Density of water is maximum at ………:
a. 40C
b. 00C
c. 60C
d. 20C
4. The density of water at 40 C is:
a. 3 gcm-3
b. 1 gcm-3
c. 4 gcm-4
d. 2 gcm-3
5. The freezing point of water at sea level is:
a. 20C
b. 00C
c. 30C
d. 10C
6. How much percentage of water is drinkable out of all the water present on Earth?
a. 0.2%
b. 0.001%
c. 90%
d. 2.1%
7. The HOH bond angle in water is:
a. 104.70
b. 104.50
c. 104.80
d. 104.60
8. Which of the following ion is not a cause of water hardness?
a. SO2-4
b. Ca2+
c. Na+
d. Mg2+
9. The removal of Mg+2 and Ca+2 ions which are responsible for the hardness of water is called:
a. Water softening
b. Permanent hardness
c. Hydrogen bonding
d. Temporary hardness
10. Which of the following method is used for removing temporary water hardness?
a. Sodium zeolite
b. Clark’s method
c. Filtration method
d. Washing soda method
12. The types of water hardness are:
a. Four
b. Two
c. Five
d. Three
13. Permanent hardness is because of:
a. NaCl
b. Ca(HCO3)2
c. CaCl2
d. Mg(HCO3)2
14. Temporary hardness of water is removed by adding:
a. Ca(OH)2
b. NaOH
c. CaSO4
d. KOH
15. Temporary hardness of water can be removed by adding:
a. Quick lime
b. Lime stone
c. Washing soda
d. Slaked lime
16. Which of the following is an agricultural influent?
a. Detergents
b. Heavy metals
c. Fertilizers
d. Mineral acids
17. In water, ……… ions are responsible for the quick growth of algae:
a. Cl−,SiO2-3
b. NO–3−,PO3-4
c. SO4 2-,CO32-
d. Br−,Cl−
18. The rain water is slightly acidic it is because:
a. SO2
b. SO3
c. NO2
d. CO2
19. The industrial effluents, when taken by men, are\ responsible for disease:
a. Pleague
b. Cancer
c. Cholera
d. Asthma
20. Cholera is caused by:
a. Fungi
b. Virus
c. Protozoa
d. Bacteria
21. Vibrios cholera bacteria causes the disease:
a. Typhoid
b. Cholera
c. Hepatitis
d. Dysentery
22. The cause of cholera is:
a. Bacteria
b. Protozoa
c. Fungi
d. Virus
23. Swimming pools are cleaned by a process called:
a. Nitration
b. Bromination
c. Chlorination
d. Hydrogenation
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