Problem 1
Temporary hardness of water is due to the presence of (a) \(\mathrm{Mg}\left(\mathrm{HCO}_{3}\right)_{2}\) and \(\mathrm{Ca}\left(\mathrm{HCO}_{3}\right)_{2}\) (b) \(\mathrm{MgCl}_{2}\) and \(\mathrm{MgSO}_{4}\) (c) \(\mathrm{CaCl}_{2}\) and \(\mathrm{CaSO}_{4}\) (d) \(\mathrm{Ca}\left(\mathrm{NO}_{3}\right)_{2}\) and \(\mathrm{MgCl}_{2}\)
Problem 2
Which of the following is incorrect regarding solution of sodium bicarbonate in watert (a) Weakly acidic (b) Yellow colour with methyl orange (c) No colour with phenolphihalein (d) Two of the above
Problem 3
Barium chloride is treated with potassium chromate. A ppt. is observod. What is the colour 7 (a) yellow (b) green (c) white (d) flesh
Problem 5
A metal \(\mathrm{X}\) on heating in nitrogen gas gives Y. \(\mathrm{Y}\) on treatment with \(\mathrm{H}_{2} \mathrm{O}\) gives a colourless gas which on passing through \(\mathrm{CuSO}_{4}\) solution tums it deep blue. \(\mathrm{Y}\) is (a) \(\mathrm{Mg}\left(\mathrm{NO}_{3}\right)_{2}\) (b) \(\mathrm{Mg}_{3} \mathrm{~N}_{2}\) (c) \(\mathrm{NH}_{1}\) (d) \(\mathrm{MgO}\)
Problem 6
Bleaching powder is prepared by passing chlorine into (a) \(\mathrm{Ca}(\mathrm{OCl})_{2}\) (b) \(\mathrm{Ca}(\mathrm{OH})_{2}\) (c) \(\overline{\mathrm{CaH}}\). (d) \(\mathrm{Ca}(\mathrm{ClO}\)
Problem 7
On heating sodium carbonate is evolved. (a) \(\mathrm{CO}_{2}\) (b) \(\mathrm{CO}\) (c) \(\mathrm{H}_{2} \mathrm{O}\) (d) No gas
Problem 8
A piece of magnesium ribbon was heated to redness in an atmosphere of nitrogen and on cooling water was added, the gas evolved was (a) ammonia (b) hydrogen (c) nitrogen (d) oxygen
Problem 9
Which of the following is arranged in order of decreasing solubility in water? (a) \(\mathrm{BaSO}_{4}>\mathrm{SrSO}_{4}>\mathrm{CaSO}_{4}>\mathrm{MgSO}_{4}>\mathrm{BeSO}_{4}\) (b) \(\mathrm{BeSO}_{4}>\mathrm{CaSO}_{4}>\mathrm{MgSO}_{4}>\mathrm{SrSO}_{4}>\mathrm{BaSO}_{4}\) (c) \(\mathrm{BeSO}_{4}>\mathrm{MgSO}_{4}>\mathrm{CaSO}_{4}>\mathrm{SrSO}_{4}>\mathrm{BaSO}_{4}\) (d) \(\mathrm{CaSO}_{4}>\mathrm{BaSO}_{4}>\mathrm{BeSO}_{4}>\mathrm{MgSO}_{4}>\mathrm{SrSO}_{4}\)
Problem 10
Which of the following on thermal decomposition yields a basic as well as an acidic oxide? (a) \(\mathrm{KClO}_{3}\) (b) \(\mathrm{CaCO}_{3}\) (c) \(\mathrm{NH}_{4} \mathrm{NO}_{3}\) (d) \(\mathrm{NaNO}_{3}\)
Problem 12
Which of the following compounds on reacting with \(\mathrm{NaOH}\) and \(\mathrm{H}_{2} \mathrm{O}_{2}\) gives a yellow colour? (a) \(\mathrm{Cr}(\mathrm{OH})_{3}\) (b) \(\mathrm{Zn}(\mathrm{OH})_{2}\) (c) \(\mathrm{Al}(\mathrm{OH})_{3}\) (d) \(\mathrm{Fe}(\mathrm{OH})_{3}\)
