Question
Match the column A with column B.


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| 1. Sodium silicate | (a) glow to the clothes |
| 2. Fluorescent whitening agent | (b) removal of certain stains |
| 3. Sodium perborate | (c) prevent the caking of the detergent powder |
| 4. Sodium sulphate | (d) prevents corrosion |
| i. Sugar in water | (a) Exothermic process |
| ii. Sulphur in carbon sulphide | (b) Aqueous solution |
| iii. The solubility of CaO | (c) Endothermic process |
| iv. Solubility of $KNO_3$ | (d) Non-aqueous solution |
| 1. Acyclic compounds | (a) Cyclobutene |
| 2. Alicyclic compounds | (b) Ethene |
| 3. Homocyclic aromatic compounds | (c) Pyridine |
| 4. Heterocyclic compounds | (d) Benzene |
| 1. Big Bang theory | (a) study of regions and practical use of plants |
| 2. Petrifaction | (b) organisms buried and cause depression |
| 3. Archaeopteryx | (c) other names for astrobiology |
| 4. Ethnobotany | (d) preserve hard and soft parts |
| 5. Mould | (e) origin of the universe |
| 6. Exobiology | (f) fossil bird |
| 1. Power | (a) V = IR |
| 2. Joule’s law | (b) ρ=RAl |
| 3. Ohm’s law | (c) P = VI |
| 4. Specific Resistance | (d) I = Qt |
| 5. Electric energy | (e) $H = I^2$ |

| Process | Ores |
| i. Hydraulic process | (a) $ZnS$ |
| ii. Magnetic separation | (b) $Fe _2 O _3$ |
| iii. Froth floatation process | (c) $SnO _2$ |
| iv. Leaching process | (d) $Al _2 O _3 \cdot 2 H _2 O$ |
| 1. LED | (a) heating device |
| 2. Fuse wire | (b) alloy |
| 3. Tungsten | (c) semiconductor device |
| 4. Nichrome | (d) Filament |
| 5. Electric heater | (e) MCB |
| Alloy | Metals present | Uses |
| 1. Brass | Fe, C, Ni | Statues, Coins |
| 2. Bronze | Al, Mg, Mn, Cu | Aircraft, Pressure cookers |
| 3. Duralumin | Fe, C, Ni, Cr | Cables, Propeller |
| 4. Magnalium | Cu, Sn | Automobile parts, Utensils |
| 5. Stainless steel | Cu, Zn | Scientific instruments, Air craft |
| 6. Nickel steel | Al, Mg | Medals, decorative items |
