1.
A metal occurs in nature as in are X which on heating in air converts to Y. Y reacts with unreacted X to give the metal. The metal is
2.
Metals like Na, K, Ca and Mg are extracted by electrolysis of their chlorides in molten salt. These metals are not extracted by reduction of their oxides with carbon because (a)Reduction with carbon is very expensive (b) Carbon readily makes alloys with these metals (c) Carbon has less affinity for oxygen (d) Carbon is a water reducing agent than these metals.
3.
Which of the following cannot be used to extract a metal from its ore ?
4.
When sodium is treated with sufficient oxygen/air, the product obtained is:
5.
Choose the correct sets which represent the oxides as Acidic : basic : neutral: amphoteric respectively (i) CO2: MgO : N2O : H2O (ii) SO2: NO : CO : Al2O3 (iii) P2O5: ZnO : NO :Al2O3 (iv) SO3: CaO: N2O : PbO
6.
The characteristic not related to alkali metal is :
7.
Highly pure dilute solution of Na in liquid NH3:
8.
The metal that can be obtained by electrolysis of an aqueous solution of its salts is:
9.
The reaction of sodium is highly exothermic with water. The rate of reaction is lowered by:
10.
Which of the following compounds, the one that gets hydrolysed to form metallic hydroxide, hydrogen peroxide and oxygen is:
