In the electrolytic refining of a metal $M$, what would you take as the anode, the cathode and the electrolyte ?
In the electrolytic refining of a metal $M$ :
Anode $\rightarrow$ Impure metal $M$
Cathode $\rightarrow$ Thin strip of pure metal $M$
Electrolyte $\rightarrow$ Solution of salt of the metal $M$
A man went door to door posing as a goldsmith. He promised to bring back the glitter of old and dull gold ornaments. An unsuspecting lady gave a set of gold bangles to him which he dipped in a particular solution. The bangles sparkled like new but their weight was reduced drastically. The lady was upset but after a futile argument the man beat a hasty retreat. Can you play the detective to find out the nature of the solution he had used?
Why is sodium kept immersed in kerosene oil ?
Name two metals which are found in nature in the free state.
Write equations for the reactions of
$(i)$ iron with steam
$(ii)$ calcium and potassium with water
Pratyush took sulphur powder on a spatula and heated it. He collected the gas evolved by inverting a test tube over it, as shown in figure below.
$(a)$ What will be the action of gas on
$(i)$ dry litmus paper ?
$(ii)$ moist litmus paper ?
$(b)$ Write a balanced chemical equation for the reaction taking place.