Question
✓
Answer
1. (c) Resistor
2. (e) Rheostat
3. (b) Voltmeter
4. (a) Ammeter
5. (d) Diode
2. (e) Rheostat
3. (b) Voltmeter
4. (a) Ammeter
5. (d) Diode
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STD
| i. 22 g of $CO _2$ | (a) 2 moles |
| ii. 18 g of $H _2 O$ | (b) 4 moles |
| iii. 360 g of Glucose | (c) 0.5 mole |
| iv. 64 g of $CH _4$ | (d) 1 mole |
| (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 |
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| 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 |
| i. Solubility of $KNO _3$ | (a) decreases with increase in temperature |
| ii. The solubility of CaO | (b) increases with increase in pressure |
| iii. The solubility of oxygen | (c) increases with increase in temperature |
| iv. Solubility of $CO _2$ | (d) more in cold water |
| 1. Deuterium | (a) |
| 2. Protium | (b) |
| 3. Tritium | (c) |
| 4. α – decay | (d) |
| 5. β – decay | (e) |
| 1. $C _n H _{2 n +2}$ | (a) Alkene |
| 2. $C _{ n } H _{2 n }$ | (b) Alcohol |
| 3. $C _{ n } H _{2 n -2}$ | (c) Alkane |
| 4. ROH | (d) Alkyne |
| 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 |
| 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 |