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 Avogadro’s law.
Avogadro's law states that, "equal volume of all gases, at the same temperature and pressure, have the same number of molecules.
State your observation in the following case:
at the cathode when acidified aqueous copper sulphate solution is electrolyzed with copper electrodes.
Name the following:
The property possessed by metals by which they can be beaten into sheets.