What type of tricky questions can I get in SA-1 on this topic?

Asked by Kalita Padmanath | 1st Jun, 2014, 12:29: PM

Expert Answer:

The following are few High Order Thinking Questions based on the Topic: Combination and Decomposition Reaction

1. Bhawana took a pale green substance A in a test tube. and heated it over the flame of a burner. A brown colored residue B was formed along with evolution of two gases with burning smell of sulphur.Idetify A & B. Write the chemical reaction involved.

2. A compound `X` is used for drinking, has pH =7.Its acidified solution undergoes decomposition in presence of electricity to produce gases `Y` and `Z` The volume of Y is double than Z. Y is highly combustible whereas Z is supporter of combustion .Identify X, Y & Z and write the chemical reactions involved.

3. A student took 2-3 g of a substance X in a glass beaker & poured water over it slowly. He observed bubbles along with hissing noise. The beaker becomes quite hot. Identify X.What type of reaction is it?

4. A substance X used for coating iron articles is added to a blue solution of a reddish brown metal Y, The color of the solution gets discharged Identify X and Y & also the type of reaction.

5. A student has mixed the solutions of lead (II) nitrate and potassium iodide.
(i) What was the colour of the precipitate formed? Can you name the compound precipitated ?
(ii) Write the balanced chemical equation for this reaction.

(iii) What type of reaction is it?

6. Observe the following activity & answer the questions

a. Do you observe anything happening around the zinc granules?
b. Is there any change in its temperature?
c. Why is glass tube not dipped in dil H2SO4?
d. How is H2 gas collected by downward displacement or upward displacement of water?
e. Is H2 gas soluble or insoluble in water?
f. Is H2 gas heavier or lighter than air?

7. A reddish brown metal X when heated in presence of oxygen forms a black compound Y which is basic in nature when heated with hydrogen gas gives back X. Identify X & Y.Write the chemical reaction between Y & H2 Identify the substance being oxidized & reduced.

8. Name the type of reaction seen in the diagram below. Write the reaction for the

9. A student dropped few pieces of marble in dilute HCl contained in a test tube. The gas evolved was passed through lime water. What change would be observed in lime water? Write chemical reactions for both the changes observed.

10. Shwetha has been collecting silver coins and copper coins. One day she observed a black coating on silver coins and a green coating on copper coins. Which chemical phenomenon is responsible for these coatings? Write the chemical name of black and green coatings

Answered by Hanisha Vyas | 2nd Jun, 2014, 04:09: PM