Question

chose the correct answer
1. Burning of magnesium ribbon in air is an example of
i) combination reaction ii) oxidation reaction
iii) both (i) and (ii) iv) none of the above
2. Metals react with acids to give which gas?
i) oxygen ii) carbon dioxide
iii) hydrogen iv) nitrogen
3. Gypsum is
i) CaSO4 ii) CaSO4.H2O
iii) CaSO4.2H2O iv) CaSO4.1/2H2O
4. Decomposition of silver bromide is which type of reaction?
i) Electrolytic ii) photolytic
iii) thermal iv) Synthetic
5. Reddish fumes observed during thermal decomposition of lead nitrate is of
i) bromine gas ii) nitrogen dioxide gas
iii) sulphur dioxide gas iv) chlorine gas
6. The gas evolved when 1g of NaCl is added to concentrated H2SO4 is
i) Dry HCl which turns wet litmus paper blue
ii) Dry HCl which turns dry litmus paper blue
iii) Dry HCl which turns wet litmus paper red
iv) Dry HCl which turns dry litmus paper red
7. Which of the following is an exothermic reaction?
i) Reaction of water with quick lime
ii) Evaporation of water
iii) Burning of magnesium ribbon
iv) decomposition of iron sulphate
8. Which of the following types of medicines is used for treating indigestion?
i) Antibiotic ii) Analgesic iii) Antacid iv) Antiseptic

Answer 1

Answer:

1.iii) 2.iii) 3.iii) 4.ii)5.ii) 6.i)7.i)8.iii)

sorry if i'm wrong anywhere

Answer 2

Explanation:

1.i

2.iii

3.iii

4.ii

5.ii

6.i

7.i

8.iii

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