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.
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 your observation in the following case:
at the cathode when acidified aqueous copper sulphate solution is electrolyzed with copper electrodes.
State the main components of the following alloys:
Bronze
(Cu +Sn) Copper and Tin are the components of the Bronze alloys:
Name the following:
The property possessed by metals by which they can be beaten into sheets.