Which is the reducing agent in the extraction of Iron?
CaCO3
FeO
CO
SiO2
The reaction of hydrochloric acid with limestone leads to the production of gas X, which turns lime water milky.Gas X is
carbon dioxide
carbon monoxide
hydrogen peroxide
hydrogen sulphide
Which of the following statements is incorrect regarding metals?
Metals are ductile.
Metals are sonorous.
Metals have a shiny appearance.
Metals are poor conductors of heat.
Most metals burn in air. What do they form ? What is the nature of the resultant?
metal oxides which are acidic
metal hydroxides which are basic
metal oxides which are basic
metal hydroxides which are acidic
Which of the following substances cannot be used as a starting material for the preparation of ammonia?
Urea
Nitrobenzene
Ammonium salts
Metal nitrides
Which of the following gas is evolved when dilute mineral acids are treated with metal hydrogen carbonates?
H2
O2
CO2
Which method is used to concentrate the ore of Aluminium.?
Leaching
Froth floatation
Magnetic seperation
Calcination
The metal getting from blast furnace is
Steel
Medium steel
Pig iron
Mild steel
Which of the following ores is not an ore of iron?
Siderite
Haematite
Malachite
Magnetite
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.
