Question
| Column A | Column B |
| (a) Global warming | 1. Hydrated ferric oxide |
| (b) Acid rain | 2. Manganese dioxide |
| (c) Rust | 3. Carbon dioxide |
| (d) Catalyst | 4. Methane |
| (e) Photosynthesis | 5. Nitrogen Dioxide |
| Column A | Column B |
| (a) Global warming | 1. Hydrated ferric oxide |
| (b) Acid rain | 2. Manganese dioxide |
| (c) Rust | 3. Carbon dioxide |
| (d) Catalyst | 4. Methane |
| (e) Photosynthesis | 5. Nitrogen Dioxide |
| Column A | Column B |
| (a) Global warming | 4. Methane |
| (b) Acid rain | 5. Nitrogen Dioxide |
| (c) Rust | 1. Hydrated ferric oxide |
| (d) Catalyst | 2. Manganese dioxide |
| (e) Photosynthesis | 3. Carbon dioxide |
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| Column A | Column B |
| (a) Helium | (1) Electric bulb |
| (b) Neon | (2) Thermometer |
| (c) Argon | (3) Semiconductor |
| (d) Germanium | (4) Weather balloons |
| (e) Mercury | (5) Advertising signboards |
| Column A | Column |
| 1. Iron and sulphur do not retain their properties in iron sulphide. | (a) Homogeneous |
| 2. Brass and bronze are two metal-metal mixtures with a special name. | (b) Water |
| 3. The solvent in a sugar solution. | (c) Alloy |
| 4. A mixture whose constituents are mixed uniformly. | (d) Compound |
| Column A | Column B |
| 1. Largest Constituent of air, which dilutes the activity of oxygen. | (a) Oxygen |
| 2. A gas used for filling weather observation balloons. | (b) carbon acid |
| 3. An acid formed by the dissolution of sulphur dioxide gas in water. | (c) Sulphur acid |
| 4. An acid formed by the dissolution of carbon dioxide in water. | (d) Helium |
| 5. A gas vital for respiration. | (e) Nitrogen |
| Column A | Column B |
| 1. To separate grain from chaff | a. filtration |
| 2. To seperat sawdust from water | b. sedimentation and decantation |
| 3. To separate iodine from sodium chloried | c. winnowing |
| 4. To separate iron fillings from sand | d. sublimation |
| 5.It is used to separate sand and water | e.magnetic separation |
| f. handpiicking |
| Column A | Column B |
| 1. A subatomic particle within the nucleus of an atom having no electric charge. | (a)Atom |
| 2. A negatively charged particle in an atom with a negligible mass. | (b) Neutron |
| 3. The central core of an atom. | (c) Electron |
| 4. The smallest particle of an element, which may or may not have independent existence, but always takes part in a chemical reaction. | (d) Nucleus |
1. Force of attraction between the molecules of matter. | (b) Intermolecular force |
2. Spaces in between the molecules of matter. | (d) Intermolecular space |
3. Any material which occupies space and has mass. | (a) Matter |
4. A state of matter which is incompressible. | (c) Liquid |
5. A state of matter which can have any number of free surfaces. | (d) Solid |
| Column A | Column B | ||
| 1 | A metal used for making high quality mirrors . | a | Chlorine |
| 2 | A metal which neither malleable nor ductile. | b | Graphite |
| 3 | A non-metal,used in the sterilsation of water. | c | Iodine |
| 4 | A non-metal, whose deficiency can lead to disease like goitre. | d | Silver |
| 5 | A non -metal which can be used as dry lubricant. | e | Zinc |
| Column A | Column B |
| (a) Evaporation of water | (i) Non-periodic change |
| (b) Milk turning sour | (ii) Periodic change |
| (c) Earthquake | (iii) Chemical change |
| (d) Change of seasons | (iv) Physical change |
| (e) Glowing of bulb | (v) Reversible change |
| Column A | Column B |
| 1. A metal used for making high quality mirrors. | (a) Chlorine |
| 2. A metal which neither malleable nor ductile. | (b) Graphite |
| 3. A non-metal used in the sterilization of water. | (c) lodine |
| 4. A non-metal whose deficiency can lead to disease like goiter. | (d) Silver |
| (e) Zinc |
| Column A | Column B |
| 1. Charged particle | a. Element |
| 2. ZnS | b. Ion |
| 3. Positively charged ion | c. Nucleus |
| 4. Central core of an atom | d. Zinc sulphide |
| e. Cation |