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- 1. Multiple Choice
2. Which of the statements about the reaction below are incorrect? 2PbO(s) + C(s) → 2Pb(s) + CO2 (g)
(i) Lead is getting reduced. (ii) Carbon dioxide is getting oxidised. (iii) Carbon is getting oxidised. (iv) Lead oxide is getting reduced.
i/ii and iii
i and ii
i and iii
all of the above
- 2. Multiple Choice
3. The reaction, Zn + 2HCl → ZnCl2 + H2 is an example of:
displacement reaction
double displacement reaction
combination reaction
dicomposition reaction
- 3. Multiple Choice
4. The brown gas evolved on heating of copper nitrate is
(a) O2
(b) NO2
(c) N2
(d) NO
none of the above
- 4. Multiple Choice
5. The given reaction indicates that:
Cu + 2AgNO3 → Cu(NO3)2 + 2Ag
(a) Copper is more reactive than silver.
(b) Silver is more reactive than copper.
(c) Both are equally reactive.
(d) None of the above
- 5. Multiple Choice
6. Which of the following is an example of displacement reaction?
(a) 4 Na+ O2 → 2Na2O
(b) 2 Cu + O2 → 2CuO
(c) Mg + 2HCl → MgCl2 + H2
(d) N2 + 3H2 → 2NH3
- 6. Multiple Choice
7. One of the constituents of baking powder is sodium hydrogen carbonate, the other constituent is
(a) hydrochloric acid
(b) tartaric acid
(c) acetic acid
(d) sulphuric acid
- 7. Multiple Choice
8. . Four student (a), (b), (c) and (d) measured the pH values of water, lemon juice and sodium bicarbonate solution. What is the correct decreasing order of pH values?
(a) Water > lemon juice > sodium bicarbonate
(b) Water > sodium bicarbonate > lemon juice
(c) Lemon juice > water > sodium bicarbonate
(d) Sodium bicarbonate > water > lemon juice
- 8. Multiple Choice
9. Zinc granules on treating with an acid X, form the zinc sulphate (ZnSO4) salt along with the evolution of a gas Y which burns with a pop sound when brought near to a burning candle. Identify the acid X and gas evolved Y.
a. X- Sulphuric acid and Y- Oxygen gas
b. X- Hydrochloric acid and Y- Oxygen gas
c. X- Sulphuric acid and Y- Hydrogen gas
d. X- Hydrochloric acid and Y- Hydrogen gas
- 9. Multiple Choice
10. The figure given below represents the experiment carried out between conc. sulphuric acid and sodium chloride, which react with each other to form HCl gas.
Blue litmus paper is brought near the mouth of the delivery tube to check the presence of HCl acid but no change is observed in the color of litmus paper because:
a. The litmus paper used is dry
b. The litmus paper used is moist
c. Blue litmus paper does not change its color with an acid
d. The litmus paper is kept very close to the mouth of the delivery tube
- 10. Multiple Choice
11. Identify the products of the following reaction:8. Identify the products of the following reaction:
CaCO3 + 2HCl ---->_____ + ______
a. Calcium hydrogencarbonate and chlorine gas
b. Calcium chloride and water
c. Calcium oxide, carbon dioxide and water
d. Calcium chloride, carbon dioxide and water
- 11. Fill in the Blank
An ant’s sting can be treated with …………which will neutralise the effect of the chemical injected by the ant’s sting into our skin.
- 12. Multiple Choice
12. In the following reaction, identify the salt formed
NH4OH (aq) + H2SO4 (aq) → _____ + 2H2O (l)
a. NH4NO3
b. (NH4)2SO4
c. (NH4)3PO4
d. (NH4)2S
- 13. Multiple Choice
13. Copper sulphate crystals when heated strongly, lose their water of crystallization to give anhydrous copper sulphate accompanied by a change in color from:
a. Blue to green
b. Blue to white
c. Blue to sky blue
d. Blue to grey
- 14. Fill in the Blank
The ability of metals to be drawn into thin wire is known as
- 15. Fill in the Blank
The most abundant metal in the earth’s crust is
- 16. Multiple Choice
17. Which of the following is the correct arrange-ment of the given metals in ascending order of their reactivity?Zinc, Iron, Magnesium, Sodium
(a) Zinc > Iron > Magnesium > Sodium
(b) Sodium > Magnesium > Iron > Zinc
(c) Sodium > Zinc > Magnesium > Iron
(d) Sodium > Magnesium > Zinc > Iron
- 17. Multiple Choice
18. Example of an amphoteric oxide is:
(a) Na2O
(b) K2O
(C) Al2O3
(d) MgO
- 18. Multiple Choice
19. The process in which a carbonate ore is heated strongly in the absence of air to convert it into metal oxide is called
(a) Roasting
(b) Reduction
(c) Calcination
(d) Smelting
- 19. Fill in the Blank
Galvanisation is a method of protecting iron from rudftng by coating with a thin layer of
- 20. Multiple Choice
1. In which of the following chemical equations, the abbreviations represent the correct states of the reactants and products involved at reaction temperature?
(a) 2H2(I) + O2(I) → 2H2O (g)
(b) 2H2(g) + O2(I) → 2H2O (I)
(c) 2H2(g) + O2(g) → 2H2O (I)
(d) 2H2(g) + O2(g) → 2H2O (g)
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