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Answer
(1 - b - iii), (2 - с - і), (3 - a - ii)
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Make pairs of substances and their properties
| Substance | Property |
| a. Potassium bromide (KBr) | 1. Combustible |
| b. Gold | 2. Soluble in water |
| c. Sulphur | 3. No chemical reaction |
| d. Neon | 4. High ductility. |
| Column A | Column B | Column C |
| (i) Triad | (a) Positive change on the nuleus | (1) Mendeleev |
| (ii) Octave | (b) Sequential change in molecular formulae | (2) Dobereiner |
| (iii) Atomic number | (c) Average of the first and the third atomic mass | (3) Newlands |
| (iv) Period | (d) Properties of the eighth element similar to the first | (4) Mosely |
| Column A | Column B |
| (1) Solid fuel | (a) Vegetable oils |
| (2) Liquid fuel | (b) Gobar gas |
| (3) Gaseous fuel | (c) Crop residue |
Match the columns.
| Column A | Column B |
| 1) Specific latent heat of fusion | a) Air saturated with vapour |
| 2) Specific latent heat of vaporisation | b) Solid converts into liquid |
| 3) Dew point temperature | c) liquid converts into gas |
| Column $A$ Name of the Compound | Column $B$ Structural Formula | ||
| $(1)$ | Ethyl alcohol | $(a)$ | $CH_3-CH_2-CH_2-CH_3$ |
| $(2)$ | Acetone | $(b)$ | $CH_3-CH_2-CH_2-OH$ |
| $(3)$ | Propionic acid | $(c)$ |  |
| $(4)$ | Ethyne | $(d)$ |  |
| $(5)$ | Propanol | $(e)$ | $CH_3-CH_2OH$ |
| $(6)$ | Butane | $(f)$ | $HC=CH$ |
| Column 'A' | Column 'B' |
| (1) Redemption | (a) Link between emergency measures and national progress |
| (2) Restoration | (b) Plan for minimizing thedamage. |
| (3) Resurgence | (c) Plan is prepared to minimize destruction. |
| (4) Preparation | (d) Link between measures after disaster and national development. |
→
| Column 'A' | Column 'B' | Column 'C' |
| (1) Coal | (a) Potential energy | A. Wind electricity plant |
| (2) Uranium | (b) Kinetic energy | B. Hydro electric plant |
| (3) Water reservoir | (c) Nuclear energy | C. Thermal plant |
| (4) Wind | (d) Thermal energy | D. Nuclear power station |
| Column A | Column B |
| (1) Bauxite | (a) Mercury |
| (2) Cassiterite | (b) Aluminium |
| (3) Cinnabar | (c) Tin |
→