State the inference drawn from the following observations:

i) On carrying  out the flame test with a salt P a Brick red flame was obtained. What is the cation in P?

ii) A gas Q turns moist lead acetate paper silvery black. Identify the gas Q.

32.

Oxygen oxidised ethyne to carbon dioxide and water as shown by the equation:

2C₂H₅ +5O₂ ----> 4CO₂ +2H₂O

What volume of ethyne gas at S.T.P. is required to produce 8.4 cm³ carbon dioxide at S.T.P?

[H=1, C=12,O=16]

A compound made up of two element X and Y has an empirical formula X­₂Y. If the atomic weights of X is 10 and that of Y is 5 and the compounds has a vapour density 25, find its molecular formula.

State Avogadro’s law.

State your observation in the following case:
at the cathode when acidified aqueous copper sulphate solution is electrolyzed with copper electrodes.

Which electrode: anode or cathode is the oxidising electrode? Why?

State the main components of the following alloys:

Brass

State the main components of the following alloys:

Duralumin

State the main components of the following alloys:
Bronze 

Name the following:

The property possessed by metals by which they can be beaten into sheets.