Periodic Properties And Variation Of Properties Physical And Chemical — Chemistry STD 10 — Question

A gas commonly used for ripening raw fruit is:

The property which is characteristic of an electrovalent compound is that

Aluminum has a tendency to lose :

A metal which does not react with dil. sulphuric acid, but forms sulphur dioxide when heated with conc. sulphuric acid is :

When a blue coloured solution of a salt is allowed to slowly reacts with an ammonium hydroxide solution the colour of the solution slowly starts fading away.
What will happen when excess amount of ammonium hydroxide is added into the solution?

Metals like potassium, calcium, sodium, etc., can be extracted only by electrolysis. Why?

The similarities in the properties of elements belonging to a group are because they have the same ______

As the pH of solution decreases, its acidic strength progressively __________.

Electroplating is a process in which thin film of metal like gold, silver, nickel etc. gets deposited which of the observation shows correction combination with respect to electroplating of silver on brass spoon.

	Anode	Cathode	Electrolyte
W	Spoon	Pure silver	Na[Ag(CN)2]
X	Pure Silver	Spoon	Na[Ag(CN)2]
Y	Spoon	Pure silver	[Ag(CN)2
Z	Pure silver	Spoon	AgNO3

The catalyst used in the contact process is: