Question

Q1. Is it possible to have combustion without oxygen?
Q2. Is the volume of gases produced during electrolysis of water is same? If not than what is the ratio in
between them?
Q3. What will happen if silver bromide is kept for some time in sunlight?
Q4. What happens when a strip of zinc is dipped in a copper sulphate solution?
Q5. Write a balanced chemical equation with symbols for the following reactions
(i) Solutions of barium chloride and sodium sulphate in water react to give insoluble barium sulphate
and the solution of sodium chloride.
(ii) Sodium hydroxide solution (in water) reacts with hydrochloric acid solution (in water) to produce
sodium chloride solution and water.
Q6. What do you mean by a precipitation reaction?
Q7. What happens when copper turnings are added to silver nitrate solution?
Q8. Why should a magnesium ribbon be cleaned before burning in air?
Q9. Why does the blue colour of copper sulphate solution changes to green colour when an iron nairl is
dipped? Write chemical equation.
Q10. Dilute solution of ammonium hydroxide is added to aqueous solution of ferrous sulphate. Ferrous
hydroxide is formed. What is the type of this reaction ? Write chemical equation.
Q11. In the reaction :
MnO2
(s) + 4HCl(aq)  MnCl2
(aq) + Cl2
(g) + 2H2O(l)
Identify the oxidising and reducing agents.
Q12. What is an oxidation reaction ? Give an example of oxidation reaction. Is oxidation an exothermic or an
endothermic reaction ?
Q13. What is a redox reaction ? When a magnesium ribbon burnsin air with a dazzling flame and forms a
white ash, is magnesium oxidised or reduced ? Why ?
10TH _FOUNDATION_SUB_16.05.2021_Q.P.
B – 24, Dwarka More Metro Station, Gate No. 02, New Delhi, Phone No. 9871860442 4
Q14. Why the solution of silver nitrate becomes blue in colour after some time when copper turnings are
added to it?
Q15. Identify the type of reaction in the following examples :
(i) Na2SO4
(aq) + BaCl2
(aq)  BaSO4
(s) + 2NaCl(aq)
(ii) Fe(s) + CuSO4
(aq)  FeSO4
(aq) + Cu(s)
(iii) 2H2
(g) + O2
(g)  2H2O(l)
Q16. A house wife wanted heer house to be white washed. She bought 10 kg of quick lime from the market and
dissolved in 30 litres of water. On adding lime to water, she noticed that the water started boiling even
when it was not being heated. Give reason for her observation. Write the corresponding equation and
name the product formed.
OR
When a green iron salt is heated strongly, its colour finally changes to black and odour of burning
sulphur is given out.
(i) Name the iron salt
(ii) Name the type of reaction that takes place during the heating of iron salt.
(iii) Write the chemical equation for the reaction involved.

Answer 1

Answer:

sorry there are many questions