1. Each day human body breathe in _______ liters of air.
(A) 5,000 to 10,000
(B) 10,000 to 15,000
(C) 15,000 to 20,000
(D) 20,000 to 25,000

2. The most abundant element in the universe is
(A) Hydrogen
(B) Oxygen
(C) Carbon dioxide
(D) Silicon

3. The substance which increases the rate of chemical reaction is
(A) Metal
(B) Catalyst
(C) Alloy
(D) Enzymes

4. The average human body contains about _______ gram of Sodium Chloride.
(A) 190
(B) 210
(C) 230
(D) 250

5. pH is an abbreviation for?
(A) Power of Hydrogen
(B) Possibility of Hydrogen
(C) Population of Hydrogen
(D) Position of Hydrogen

6. The best soil pH value for most crops and plants is
(A) 4.5
(B) 5.5
(C) 6.5
(D) 7.5

7. __________ are biological catalysts.
(A) Enzymes
(B) Minerals
(C) Proteins
(D) Vitamins

8. The most abundant constituent in Air is
(A) Oxygen
(B) Hydrogen
(C) Carbondioxide
(D) Nitrogen

9. Isotopes are atoms of the same element with different numbers of
(A) Protons
(B) Electrons
(C) Neutrons
(D) Positron

10. Over __________ of the elements in the Periodic Table are Metals.
(A) 60%
(B) 65%
(C) 70%
(D) 75%

11. Those substances which give hydroxyl ions in water are called
(A) Acid
(B) Base
(C) Salts
(D) Alkalies

12. Those substances which give hydrogen ions in water are called
(A) Base
(B) Salts
(C) Neutral
(D) Acid

13. KHSO4 is a ?
(A) Base
(B) Acid
(C) Neutral
(D) Salt

14. Neutral solution has pH value of
(A) 3
(B) 5
(C) 7
(D) 14

15. According to Bronsted, Acids are
(A) Proton accepter
(B) Electron donor
(C) Proton donor
(D) Electron accepter

16. NH3 is a/an
(A) Acid
(B) Base
(C) Salts
(D) Neutral

17. Salts are
(A) Acid
(B) Base
(C) Alkalies
(D) Neutral

18. Organic compounds are originated from ?
(A) Air
(B) Sun
(C) Rocks
(D) Living organisms

19. ___________are insoluble in water.
(A) Alkanes
(B) Sugars
(C) Salts
(D) Starch

20. Poly Hydroxyl compounds of Aldehyde and ketones are called ?
(A) Carbohydrates
(B) Protein
(C) Lipids
(D) Vitamin