1.
In iron metallurgy, lime stone is used –
2.
Cu2S + 2 Cu2O → 6 Cu + SO2 reaction occurs in –
3.
When a metalis alloyed with mercury the resulting alloy[Amalgum] will have
4.
‘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.
5.
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 :
6.
The property of a material to resist shock and impact is called
7.
Which one of the following metal oxides shows both acidic and basic characters ?
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 substance which are put into the blast furnace in the manufacture of iron :
10.
Which alloy of aluminium is used for making aircrafts
