Question

3. What happens in a neutralisation reaction?
4. Name three neutral oxides.
(a) Photosynthesis
(b) Respiration
6. Why does your tongue feel cold when you put some glucose on it?
(a) Decomposition of limestone
(b) Rusting
8. What would you observe in the following cases?
(a) Carbon dioxide is passed through limewater.
(b) An ignited magnesium ribbon is placed in steam.
(c) A mixture of hydrogen and oxygen is lit.
(d) An iron knife is placed in a solution of copper(II) sulphate.
9. Give balanced chemical equations representing the following reactions.
(a) On being heated with chlorine, iron forms iron(III) chloride.
(b) Carbon dioxide dissolves in water to form carbonic acid.
5. Which of the following is an exothermic reaction and which is an endothermic reaction?
7. Which of the following reactions, once started, will continue on its own and which will not​

Answer 1

Answer:

3. In a neutralization reaction, Acid and Base reacts to give salt and water.

4. CO2, H2O, and N2O

5. a) Photosynthesis is an endothermic reaction.

b) Respiration is an exothermic reaction.

6. Our tongue feels cold because it absorbs the latent heat of vaporization from body and makes it cold in return.

7. Rusting once started will continue on its own whereas decomposition of limestone will not.

8. a) Lime water turns milky

b) Magnesium reacts with oxygen to form magnesium oxide and give white powder.

c) Hydrogen burns in oxygen to form water. The flame is almost colourless.

d) An iron knife is dipped in a blue copper sulphate solution turns the blue solution green as iron is more reactive than copper so iron will displace copper from its solution and the blue colour of copper sulphate will turn into green. This is known as Displacement reaction.

9. a) 2Fe + 3 $Cl_{2}$ --->  $2FeCl_{3}$

b) CO2 + H2O --> H2CO3

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