Which is used to make bandages?
Ca(OH)2
Ca(SO4)2H2O
CaSO4 2H2O
CuSO4.5H2O
Ammonia can be found in both free state and combined state. Which of the following alternatives does not give a source of ammonia?
Air
Natural water
Distillation of coal or wood
Exhaust of automobile engines
Which of the following gas is evolved when dilute mineral acids are treated with metal hydrogen carbonates?
H2
O2
CO
CO2
Which of the following statements is correct?
Since iodine is lustrous, it is a metal.
All metals have high melting points.
All metals are solids except mercury, which is a liquid.
Since sodium and potassium are not hard, they are not metals.
Which of the following metals is liquid at room temperature?
Iron
Copper
Mercury
Potassium
Name a compound used for making explosures.
KCl
K2SO4Al2(SO4)324H2O
KNO3
K2SO4
From the below statements which is wrong one
Froth floatation is used for the concentration of sulphide ores
Calcination is used to remove the impurity from CaCO3
Powdered ore is strongly heated. This process is roasting.
From Magnetic nature of ore impurity is removed using magnetic roller.
The smell of hydrogen sulphide resembles the smell of.
rotten eggs
rotten tomato
incense
petrol
Metal oxides which react with both acids and bases to produce salts and water are called amphoteric oxidesWhich of the following elements forms an amphoteric oxide?
Sodium
Calcium
Aluminium
Magnesium