Brij Bihari Agrawal Solutions for Chapter: Chemical Reactions and Equations, Exercise 1: Paper-Pen Test

A student while heating solid lead nitrate taken in a test tube would observe

Which of the following are the exothermic processes:
(i) reaction of water with quick lime
(ii) dilution of an acid
(iii) evaporation of water
(iv) sublimation of camphor (crystals)

Magnesium + Oxygen$\to$ Magnesium oxide

$\left[2\mathrm{Mg}+{\mathrm{O}}_2\to 2\mathrm{MgO}\right]$ is an example of

Electrolysis of water is a decomposition. The mole ratio of hydrogen and oxygen gases liberated during electrolysis of water is;

Which of the following metals can not displace copper from copper sulphate solution?

Which of the following will be required to identify the gas evolved when dilute hydrochloric acid reacts with zinc metal

A piece of granulated zinc was dropped into copper sulphate solution. After some time, the colour of the solution changed from

A student take some zinc granules in a test tube and adds dilute hydrochloric acid to it.

He would observe that the colour of zinc granules change to: