Question

Chemistry:
Q. 1. Fe2O3 + 2 Al → Al2O3 + 2 Fe
The above reaction is an example of -
(a) Combination reaction
(c) Double displacement reaction
(b) Displacement reaction
(d) Decomposition reaction
Q. 2. Galvanisation of iron means coating of iron with -
(a) Nickel (b) Zinc (c) Tin (d) Copper
Q. 3. Which one of the following is a weak acid?
(a) HCI (b) H2CO3 (c) HNO3 (d) H2SO4
Q. 4. pH of sodium carbonate (Na2CO3) solution will be
(a) >
(b) >7 (c) < 7 (d) 1
Q. 5. Lime water is
(a) Ca(OH)2 (b) CaO
(c) CaCO3
(d) CaCl2
Q. 6. Why should a magnesium ribbon be cleaned before burning in air? please give me the answer of all questions ​

Answer 1

Answer:

Hello buddy thanks for free points.

Answer 2

Answer:

Q.1. b) Displacement reaction

Q.2. b) Zinc

Q.3. b) H2CO3

Q.4. b) >7

Q.5. a) Can(OH)2

Q.6. The layer of Magnesium Oxide is formed on the ribbon due to reaction with Oxygen and Water which is called corrosion due to which the combustion process may not take place. So it is advisable to clean e ribbon with sand paper.

Hope u understood