Chemistry
Complete the following sentences by choosing the correct answer from the brackets:
(a) The metal to be refined is kept at the …………… during the process of electro-refining. [cathode / anode]
(b) Dilute HCl and dilute H2SO4 can be distinguished by adding …………… solution. [NaNO3 / BaCl2]
(c) Ammonia gas is collected by …………… displacement of air. [upward / downward]
(d) The gas formed when copper carbonate is heated is …………… [O2 / CO2]
(e) Excess ammonia reacts with chlorine to form …………… [nitrogen / nitrogen trichloride]
Answer
(a) The metal to be refined is kept at the anode during the process of electro-refining.
(b) Dilute HCl and dilute H2SO4 can be distinguished by adding BaCl2 solution.
(c) Ammonia gas is collected by downward displacement of air.
(d) The gas formed when copper carbonate is heated is CO2.
(e) Excess ammonia reacts with chlorine to form nitrogen.
Related Questions
(a) Balance the chemical equation given below:
FeS2 + O2 ⟶ Fe2O3 + SO2(b) Write balanced chemical equation for formation of ‘B’.
(c) Why is it necessary to convert ‘B’ to Oleum?
(d) Identify ‘C’.
(e) Write an equation for the reaction between Oleum and ‘C’.
Ammonium hydroxide solution is added to the solution containing the ions mentioned in List X. List Y gives the details of the precipitate. Match the ions with their coloured precipitates.
List X List Y (a) Zn2+ 1. No visible reaction (b) Fe2+ 2. White precipitate insoluble in excess (c) Pb2+ 3. Gelatinous white precipitate soluble in excess (d) Fe3+ 4. Blue precipitate soluble in excess (e) Ca2+ 5. Dirty green precipitate insoluble in excess 6. Reddish brown precipitate insoluble in excess State the terms for the following:
(a) A substance which when dissolved in water forms hydronium ion as the only positive ion.
(b) A type of covalent bond in which electrons are shared equally between the combining atoms.
(c) The process by which a base metal is coated with another metal, either to protect the metal or to give it an attractive appearance.
(d) The type of reaction characteristic for alkanes.
(e) The substance which oxidises the other substance and itself gets reduced.
(a) Draw the structural diagram for the following organic compounds:
- bromoethane
- methanal
- but-2-yne
(b) Give IUPAC name for the following organic compounds:
