Out of the following isomeric alcohols containing five carbon atoms, the alcohol that exhibits optical isomerism is
1-pentanol
2-pentanol
3-pentanol
2-methyl-2-butanol
Aluminium (atomic mass = 27) crystallises in a cubic system with edge length of 4 Å. Its density is 2. 7 g cm-3 The number of aluminium atoms present per unit cell is
5
6
4
2
For two isomorphous crystals A and B, the ratio of density of A to that of B is 1.6 while the ratio of the edge length of B to that of A is 2. If the molar mass of crystal B is 200 g mol-1, then that of crystal A is
240 g mol-1
40 g mol-1
80 g mol-1
160 g mol-1
A binary solid has a primitive cubical structure with B- ions constituting the lattice points and A+ ions· occupying 25% of its tetrahedral holes. The molecular formula of the crystal is
A2B
AB3
AB2
A2B3
Match the following-
Column I | Column II |
A. Sphalerite | p. FeCO3 |
B. Malachite | q. ZnCO3 |
C. Calamite | r. Na3AlF6 |
D. Cryolite | s. CuCO3.Cu(OH)2 |
E. Siderite | t. ZnS |
A - r; B - p; C - t; D - q; E - s
A - t; B - s; C - q; D - p; E - r
A - t; B - r; C - q; D - p; E - s
A - t; B - s; C - q; D - r; E - p
D.
A - t; B - s; C - q; D - r; E - p
Amng all the given options, option d is the correct one.
In the metallurgy of zinc; the reducing agent employed in reducing the zinc oxide to crude zinc metal in the last stage is
Al
Li
Coke
Water gas