Chemistry
From the following list of substances, choose one substance in each case which matches the description given below:
Ammonium nitrate, calcium hydrogen carbonate, copper carbonate, lead nitrate, potassium nitrate, sodium carbonate, sodium hydrogen carbonate, zinc carbonate.
(a) A substance which gives off only oxygen when heated.
(b) A substance which on heating decomposes into dinitrogen oxide (nitrous oxide) and steam.
(c) A substance which gives off oxygen and nitrogen dioxide when heated.
(d) A substance which on heating leaves yellow residue.
Related Questions
Identify the gas evolved when:
(i) Sulphur is treated with conc. nitric acid.
(ii) A few crystals of KNO3 are heated in a hard glass test tube.
Identify the acid
(i) Which is used for the preparation of non-volatile acid.
(ii) The acid which is prepared by catalytic oxidation of ammonia.
Completed the table:
Name of process Inputs Equation Output Ammonia + air Nitric acid Explain why
(a) Only all-glass apparatus should be used for the preparation of nitric acid by heating concentrated sulphuric acid and potassium nitrate.
(b) Nitric acid is kept in a reagent bottle for a long time.
(c) Iron is rendered passive with fuming HNO3. Give reason.
(d) Dil. HNO3 is generally considered a typical acid but not so in it's reaction with metals.
(e) When it is left standing in a glass bottle, concentrated nitric acid appears yellow.