ICSE CHEMISTRY CLASS 10 - OBSERVATIONS - SULPHURIC ACID

OBSERVATIONS - SULPHURIC ACID

ICSE CHEMISTRY CLASS 10 - IMPORTANT OBSERVATIONS

SULPHURIC ACID

State your observations

    1.      Conc. Sulphuric acid is added to penta hydrated Copper sulphate.

ANS:  The blue colour of the copper sulphate crystals fades away and the crystals turn into amorphous powder.

    2.      Sugar crystals are added to conc. Sulphuric acid.

ANS: Sugar crystals turn into brown colour and finally leaves a black spongy mass.

    3.      Dil. Sulphuric acid added to Lead nitrate solution.

ANS: A white precipitate is formed.

    4.      The gas released when Sodium chloride is heated with conc. Sulphuric acid, is passed into a gas jar containing Ammonia gas.

ANS: When the gas is passed into a gas jar which contains Ammonia gas, it gives dense white fumes of Ammonium chloride.

    5.      Dil. Sulphuric acid is added to a metal sulphide.

ANS: A clourless gas with rotten egg smell is produced. This gas turns Lead acetate paper to Silvery black.