AIIMIIT education by naveen rachuri: June 2022

Question 1. Write a chemical equation when magnesium metal reacts with aqueous hydrochloric acid to produce a solution of magnesium chloride and hydrogen gas.
Question 2. Can a combination reaction be redox reaction.
Question 3. Why do we apply paint on iron articles?
Question 4. What are the different types of reactions?
Question 5. What is a decomposition reaction ? Give example.
Question 6. Define displacement reaction.
Question 7. What happens when sodium reacts with water?
Question 8. Write the chemical equation and name the reaction when a solution of sodium chloride is mixed with a solution of silver nitrate and a white precipitate of silver chloride is formed.
Question 9. Why does the color of copper sulphate solution change, when an iron nail is dipped in it?
Question 10. Why is photosynthesis considered as an endothermic reaction?
Question 11. Potassium chlorate (KCIO3) on heating forms potassium chloride and oxygen. Write a balanced equation for this reaction.
Question 12. Give an example of a chemical reaction characterized the change in temperature.
Question 13. What type of chemical reactions take place when:
(a)Limestone is heating?
(b)A magnesium wire is burnt in air?
(c)Electricity is passed through water?
(d)Ammonia and hydrogen chloride are mixed?
(e)Silver bromide is exposed to sunlight?
Question 14. To balance a chemical equation, can we change the formula of either reactants or products?
Question 15. Why should a magnesium ribbon be cleaned before burning in air?
Question 16. If an of the following reactions occurs spontaneously, write the balanced net ionic equation. If not, write no reaction&
(a)Pb + Zn2+ _____ Pb2+ + Zn
(b)Fe + H+ _____Fe2+ + H2
(c)Cu + Ag+ _____ Cu2+ + Ag
(d)Cr + Zn2+ _____Cr2+ + Zn
Question 17. Nickel (II) nitrate is prepared by heating nickel metal with liquid dinitrogen tetroxide. In addition to the nitrate, gaseous nitrogen monoxide is formed. Write the balanced equation.
Question 18. Why is the amount of gas collected in one of the test tubes in electrolysis of water double of the amount collected in the other? Name this gas.
Question 19. Write a balanced chemical equation with state symbols for the following reactions:-
i.Solution 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.
Q1.  What happens chemically when quick lime is added to water?

Q2.  How will you test for the gas which is liberated when HCL reacts with an active metal?

Q3.  What is an oxidation reaction? Is it exothermic or endothermic? Give one example of oxidation Reaction.

Q4.  Give an example of photochemical reaction.

Q5.  Give an example of a decomposition reaction. Describe any activity to illustrate such a reaction by heating.

Q6.  Why is respiration considered as exothermic process?

Q7.  Balance the following chemical equation.

           Fe(s) +H2O(g) = Fe3O4 + H2(g)

           MnO2 + HCL = MnCl2 + Cl2 + H2O

           HNO3 + Ca(OH)2 = Ca(NO3)2 + H2O

Q8.  On what basis is a chemical equation balanced?

Q9.  State any two observations in an activity suggesting the occurrence of a chemical reaction.

Q10.  Name a reducing agent which may be used to obtain manganese from manganese dioxide.

Q11.  What change in colour is observed when silver chloride is left exposed to sunlight? Also mention the type of chemical reaction.

Q12.  Define a combination reaction. Give one example of an exothermic combination reaction.

Q13.  What is observed when a solution of potassium iodide is added to lead nitrate solution?

              What type of reaction is this? Write a balanced chemical equation for this reaction.

Q14.  Distinguish between an exothermic and an endothermic reaction.

Q15.  Distinguish between a displacement and a double displacement reaction.

Q16.  Identify the type of reaction in the following:

              Fe + CuSO4(aq) = FeSO4(aq) + Cu(s)

              2H2 + O2 = 2H2O