Which of the following statements regarding the first law of thermodynamics is correct?
Aqueous solution of ferric nitrate when mixed with aqueous solution of potassium thiocyanate gives red colour solution. The intensity of red colour becomes constant on attaining equilibrium.
Choose the correct statement when the following chemical is added to the above solution at equilibrium.
I. Oxalic acid
II. Mercuric chloride
The pH of the solution, when
(i) sodium acetate is dissolved in water.
(ii) ammonium chloride is dissolved in water.
Dihydrogen can be prepared by which of the following reactions.
(I) Reaction of granulated Zn with dil. HCl
(II) Reaction of Zn with $a q . \mathrm{NaOH}$
(III) By heating calcium hydrogen carbonate
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