Question
| i. $NH _3, CH _4$ | (a) Polyatomic molecule |
| ii. $O _2, N_2$ | (b) Monoatomic molecule |
| iii. He, Ne | (c) Heteroatomic molecule |
| iv. Sulphur | (d) Diatomic molecule |
✓
Answer
i – c, ii – d, iii – b, iv – a.
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RCH
| Metal | Ore | Chemical formula |
| 1. Copper | Bauxite | $ZnCO _3$ |
| 2. Aluminium | Haematite | $CuFeS _2$ |
| 3. Iron | Copper pyrite | $Fe _2 O _3$ |
| 4. Zinc | Calamine | $Al _2 O _3 \cdot 2 H _2 O$ |
| i. 22.4 litres | (a) Avogadro Number |
| ii. $6.023 \times 10^{23}$ | (b) Molar volume |
| iii. 2 × vapour density | (c) 1 mole |
| iv. Mass / Atomic mass | (d) Molecular mass |
| 1. Deuterium | (a) |
| 2. Protium | (b) |
| 3. Tritium | (c) |
| 4. α – decay | (d) |
| 5. β – decay | (e) |
| (i) $S _{( g )}+ O _{2( g )} \rightarrow SO _{2( g )}$ | (a) Electrolytic decomposition reaction |
| (ii) $2 NaCl _{( ag )} \rightrightarrows 2 Na ( s )+ Cl _{2( g )}$ | (b) Combination reaction |
| (iii) $2 AgBr _{( s )} \rightrightarrows 2 Ag ( s )+{\overline{ Br _2( g )}}$ | (c) Single displacement reaction |
| (iv) $Zn _{( s )}+2 HCl _{( aq )} \rightrightarrows ZnCl _{2( aq )}+ H _{2( g )}$ | (d) Photo decomposition reaction |
Match the column I with column II.
| i. Monoatomic molecule | (a) Ozone |
| ii. Diatomic molecule | (b) Phosphorous |
| iii. Triatomic molecule | (c) Helium |
| iv. Polyatomic molecule | (d) Oxygen |
| Medium | Speed of Sound (m/s) |
| (i) Copper | (a) 343 |
| (ii) Water | (b) 331 |
| (iii) Air (0° c) | (c) 5010 |
| (iv) Air (at 20° c) | (d) 1493 |
| Sample | pH |
| (i) Oranges | (a) 8 |
| (ii) Grapes | (b) 7 |
| (iii) Pure water | (c) 3.5 |
| (iv) Egg white | (d) 4 |