Electrolysis — Chemistry STD 10 — Question

In the third period, which is the most metallic and most non-metallic element?

What do you understand by amphoteric oxide?

Give balanced chemical equations for of the following : Reaction of ammonia with sulphuric acid.

Name the compound added to pure alumina to lower the fusion temperature during the electrolytic reduction of alumina.

Write the probable colour of the following salts:
Potassium nitrate

The following table shows the tests a student performed on four different aqueous solutions which are X,Y,Z and W. Based on the observations provided, Identify the cation present

Chemical Test	Observation	Conclusion
To Solution X, ammonium hydroxide is added in minium quantity first and then in excess	A dirty white precipitate is formed which dissolves in excess to form a clear solution	(i)
To Solution Y, ammonium hydroxide is added in minimum quantity first and then in excess	A pale blue precipitate is formed which dissolves in excess to form a clear inky blue solution	(ii)
To solution W, A small quantity of sodium hydroxide solution is added and then in excess	A white precipitate is formed which remains insoluble	(iii)
To a salt Z, calcium hydroxide solution is added and then heated	A pungent smelling gas turning moist red litmus paper blue is obtained	(iv)

Write the equation for the laboratory preparation of nitric acid from potassium nitrate and concentrated sulphuric acid.

Draw the structural formula of a compound with two carbon atoms in the following case.
An alcohol containing two carbon atoms