1.
A compound 'X' green coloured solid, gets oxidised to reddish brown solid in presence of air. 'X' on heating gives brown coloured solid 'Y' and two pungent gases 'A' and 'B' 'A' turns acidified potassium dichromate solution green, X,Y,A, B and type of reaction is :
2.
In iron metallurgy, lime stone is used –
3.
Which one of the following metal oxides shows both acidic and basic characters ?
4.
The substance which are put into the blast furnace in the manufacture of iron :
5.
When a metalis alloyed with mercury the resulting alloy[Amalgum] will have
6.
Which alloy of aluminium is used for making aircrafts
7.
Cu2S + 2 Cu2O → 6 Cu + SO2 reaction occurs in –
8.
A metal carbonate X on treatment with a mineral acid liberates a gas which when passed through aqueous solution of a substance Y gives back X. The substance Y on reaction with the gas obtained at anode during electrolysis of brine gives a compound Z which can decolorise coloured fabrics. The compounds X,Y and Z respectively are
9.
The property of a material to resist shock and impact is called
10.
‘X’ is the product formed when sulphure reacts with oxygen, it dissolves in water is produce ‘Y’ choose the correct option for x and y.
