Chemistry
Name the gas that is produced in each of the following cases:
(i) Sulphur is oxidized by concentrated nitric acid.
(ii) Action of dilute hydrochloric acid on sodium sulphide.
(iii) Action of cold and dilute nitric acid on copper.
(iv) At the anode during the electrolysis of acidified water.
(v) Reaction of ethanol and sodium.
Nitric Acid
ICSE 2018
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Answer
(i) Nitrogen dioxide gas
(ii) Hydrogen sulphide gas
(iii) Nitric oxide gas
(iv) Oxygen gas
(v) Hydrogen gas
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Related Questions
State one relevant observation for each of the following:
(i) Lead nitrate solution is treated with sodium hydroxide solution drop wise till it is in excess.
(ii) At the anode, when molten lead bromide is electrolyzed using graphite electrodes.
(iii) Lead nitrate solution is mixed with dilute hydrochloric acid and heated.
(iv) Anhydrous calcium chloride is exposed to air for some time.
(v) Barium chloride solution is slowly added to sodium sulphate solution.
Give a reason for each of the following:
(i) Ionic compounds have a high melting point.
(ii) Inert gases do not form ions.
(iii) Ionisation potential increases across a period, from left to right.
(iv) Alkali metals are good reducing agents.
(v) Conductivity of dilute hydrochloric acid is greater than that of acetic acid.
Fill up the blanks with the correct choice given in brackets.
(i) Ionic or electrovalent compounds do not conduct electricity in their …………… state. (fused / solid)
(ii) Electrolysis of aqueous sodium chloride solution will form …………… at the cathode. (hydrogen gas / sodium metal)
(iii) Dry hydrogen chloride gas can be collected by…………… displacement of air. (downward / upward)
(iv) The most common ore of iron is …………… (calamine / haematite)
(v) The salt prepared by the method of direct combination is …………… (iron (II) chloride / iron (III) chloride)
(i) What do you understand by a lone pair of electrons?
(ii) Draw the electron dot diagram of Hydronium ion. (H=1; O=8)