Problem 56
Smallest among these species is: (a) Hydrogen (b) Lithium (c) Lithion ion (d) Helium
Problem 57
In the extractive of sodium by Down's process cathode and anode are respectively: (a) Nickel and chromium (b) Iron and graphite (c) Copper and nickel (d) Copper and chromium
Problem 58
Silica reacts with \(\mathrm{Mg}\) to form a magnesium compound X. X reacts with dilute HCl and forms Y. Y is: (a) \(\mathrm{MgCl}_{2}\) (b) \(\mathrm{MgO}\) (c) \(\mathrm{SiCl}_{4}\) (d) \(\mathrm{Mg} \mathrm{SiO}_{3}\)
Problem 60
One of the elements present in Carnalite shows flame colouration. The colour of the flame is: (a) Green (b) Lilac (c) Yellow (d) Orange
Problem 62
Brine solution on electrolysis will not give: (a) \(\mathrm{O}_{2}\) (b) \(\mathrm{H}_{2}\) (c) \(\mathrm{Cl}_{2}\) (d) \(\mathrm{NaOH}\)
Problem 64
The molecular formula of potash alum is: (a) \(\mathrm{K}_{2} \mathrm{Al}_{2} \mathrm{~S}_{2} \mathrm{H}_{48} \mathrm{O}_{39}\) (b) \(\mathrm{KAl}_{2} \mathrm{~S}_{2} \mathrm{H}_{48} \mathrm{O}_{40}\) (c) \(\mathrm{K}_{2} \mathrm{AlS}_{2} \mathrm{H}_{48} \mathrm{O}_{40}\) (d) \(\mathrm{K}_{2} \mathrm{Al}_{2} \mathrm{~S}_{2} \mathrm{H}_{48} \mathrm{O}_{40}\)
Problem 65
Which one of the following is dead burnt plaster? (a) Anhydrous \(\mathrm{CaSO}_{4}\) (b) \(\mathrm{CaSO}_{3}\) (c) \(\left(\mathrm{CaSO}_{4}\right)_{2} \cdot \mathrm{H}_{2} \mathrm{O}\) (d) \(\mathrm{CaSO}_{4} \cdot 2 \mathrm{H}_{2} \mathrm{O}\)
Problem 66
Photoelectric effect is maximum in: (a) \(\mathrm{K}\) (b) \(\mathrm{Cs}\) (c) \(\mathrm{Na}\) (d) \(\mathrm{Li}\)
Problem 67
Which of the following is not a Mg ore? (a) Magnesite (b) Gypsum (c) Carnalite (d) Dolomite
Problem 68
An element M reacts with chlorine to form a compound \(\mathrm{X}\). The bond angle in \(\mathrm{X}\) is \(120^{\circ} .\) What is \(\mathrm{M}\) ? (a) \(\mathrm{B}\) (b) \(\mathrm{N}\) (c) \(\mathrm{Be}\) (d) \(\mathrm{Mg}\)
