Kanav took two test tubes marked as I and II. In test-tube I, he put calcium carbonate and hydrochloric acid while in test-tube II, he put zinc granules and hydrochloric acid. He passed the gas coming out from both the test tubes in lime water. What would be his observation?

  

Observe the given reaction sequence carefully.

• $\text{ Acetic acid + Sodium hydrogencarbonate → Sodium acetate + Water + (i) }$
• $\text{(i)}+\mathrm{Ca}(\mathrm{OH}{)}_2⟶\text{(ii)+water}$

What could $\left(\mathrm{i}\right)$ and $\left(\mathrm{ii}\right)$ be?

Fill in the blanks by selecting an appropriate option.
When sugar is dissolved in water, it undergoes a (i) change but if sugar is heated in a test tube over the Bunsen burner flame, it first melts, turns brown and finally turns (ii). The new substance formed is (iii) and the change is a (iv) change.

Match column I with column II and select the correct option from the given codes.

Study the given figure carefully.

Which of the following reactions explains the above change most appropriately?

Observe the given reaction carefully and fill in the blanks by selecting an appropriate option.
${\mathrm{Fe}}_{\left(\mathrm{s}\right)}+{\mathrm{CuSO}}_{4\left(\mathrm{aq}\right)}\to {\mathrm{FeSO}}_{4\left(\mathrm{aq}\right)}+{\mathrm{Cu}}_{\left(\mathrm{s}\right)}$
Before the reaction, iron is (i) in colour and solution is (ii) in colour. After the reaction, iron gets (iii) deposits and the solution becomes (iv) in colour.