PRIYANKA B Solutions for Chapter: Chemical Reactions and Equations, Exercise 1: Value Based Questions

Astha added quick lime to water and observed that heat is produced. The kind of this reaction is:

Ardhita added zinc granules in iron sulphate solution, and made a few observations. Identify the incorrect observation.
(i) Pale green solution becomes colourless.
(ii) Black deposit seen on zinc granules.
(iii) Red deposit seen on zinc granules.
(iv) Colourless solution becomes pale green.

Shashank was asked to carry out a displacement reaction which would show the following:
(i) Formation of colourless solution
(ii) Black deposits
The reactants he should use are:

Sapna added a strip of aluminium to $50 \mathrm{m}\mathrm{L}$ of a solution of $\mathrm{F}\mathrm{e}\mathrm{S}{\mathrm{O}}_4$ in a test tube. The correct observation for change in colour of solution made by her is:

A student placed $\mathrm{Zn}$ rod in ${\mathrm{FeSO}}_4$ solution. After $10$ hours when rod was taken out and it was observed that:

Which of the following solution is coloured?

Aqueous solution of which of the following is colourless?

In which form zinc metal is used from laboratory to prepare hydrogen?