1. A
   Carbon dioxide
2. B
   Ethanol
3. C
   Pyruvate
4. D
   Lactic acid

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1. A
   $\text{BaCl}_2 + 2\text{Al}_2\text{(SO}_4)_3 \to 2\text{AlCl}_3 + 3\text{BaSO}_4$
2. B
   $3\text{BaCl}_2 + 2\text{Al}_2\text{(SO}_4)_3 \to 2\text{AlCl}_3 + 3\text{BaSO}_4$
3. C
   $3\text{BaCl}_2 + \text{Al}_2\text{(SO}_4)_3 \to 2\text{AlCl}_3 + 3\text{BaSO}_4$
4. D
   $\text{BaCl}_2 + \text{Al}_2\text{(SO}_4)_3 \to \text{AlCl}_3 + \text{BaSO}_4$

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1. A
   Decomposition reaction
2. B
   Displacement reaction
3. C
   Combustion reaction
4. D
   Redox reaction

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1. A
   4, 1, 2
2. B
   2, 2, 1
3. C
   6, 2, 2
4. D
   4, 2, 1

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1. A
   Rancidity
2. B
   Corrosion
3. C
   Oxidation
4. D
   Reduction

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1. A
   $\text{BaSO}_3$
2. B
   $\text{BaSO}_4$
3. C
   BaO
4. D
   BaS

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1. A
   $2\text{H}_2\text{O} \to 2\text{H}_2 + \text{O}_2$
2. B
   $2\text{AgBr} \to 2\text{Ag} + \text{Br}_2$
3. C
   $2\text{FeSO}_4 \to \text{Fe}_2\text{O}_3 + \text{SO}_2 + \text{SO}_3$
4. D
   $\text{CaCO}_3 \to \text{CaO} + \text{CO}_2$

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1. A
   X and Y were potassium iodide and nitric acid respectively and the yellow precipitate Z was potassium nitrate.
2. B
   X and Y were sodium hydroxide solution and hydrochloric acid respectively and the yellow precipitate Z was sodium chloride.
3. C
   X and Y were potassium chloride solution and water respectively. The yellow precipitate Z was silver chloride ions.
4. D
   X and Y were lead nitrate and potassium iodide solutions respectively. The yellow precipitate Z was lead iodide.

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1. A
   Fe, $\text{CuSO}_4$, Cu
2. B
   Zn, $\text{CuSO}_4$, Fe
3. C
   Cu, $\text{FeSO}_4$, Fe
4. D
   Cu, $\text{CuSO}_4$, Fe

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1. A
   Decomposition reaction and precipitation reaction
2. B
   Combination reaction and precipitation reaction
3. C
   Double displacement reaction and precipitation reaction
4. D
   Displacement reaction and precipitation reaction

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1. A
   Burning of metals
2. B
   Addition of more active metal to a solution of a less active metal compound.
3. C
   Extraction of metals
4. D
   Electrolysis

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1. A
   8
2. B
   $\frac{1}{16}$
3. C
   16
4. D
   $\frac{1}{8}$

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1. A
   Cu, $\text{H}_2\text{O}$
2. B
   CuO, $\text{H}_2$
3. C
   $\text{H}_2$, Cu
4. D
   $\text{H}_2\text{O}$, Cu

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1. A
   $\text{CO}_2$
2. B
   $\text{H}_2\text{S}$
3. C
   $\text{SO}_2$
4. D
   $\text{NO}_2$

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1. A
   One
2. B
   Two
3. C
   Three
4. D
   Four

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1. A
   Change in state
2. B
   Evolution or absorption of energy
3. C
   Formation of new products
4. D
   All of these

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1. A
   graphite rods, metal rods
2. B
   cathode, anode
3. C
   anode, cathode
4. D
   graphite rods, non - metal rods

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1. A
   displacement and redox
2. B
   displacement and endothermic
3. C
   decomposition and exothermic
4. D
   decomposition and redox

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1. A
   $\text{NO}_2$, $\text{O}_2$
2. B
   $\text{N}_2\text{O}_4$, $\text{O}_2$
3. C
   PbO, $\text{O}_2$
4. D
   NO, $\text{O}_3$

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1. A
   Rough and granular
2. B
   Soft and dull
3. C
   Smooth and shining
4. D
   Hard and flaky

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1. A
   3, 3 and 1
2. B
   2, 2 and 3
3. C
   2, 3 and 3
4. D
   1, 3 and 2

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1. A
   Sentence 1 is correct.
2. B
   Sentence 2 is correct.
3. C
   Sentence 3 is correct.
4. D
   Sentence 4 is correct.

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1. A
   Water $>$ Alcohol $>$ Ether
2. B
   Water $<$ Alcohol $<$ Ether
3. C
   Alcohol $>$ Water $>$ Ether
4. D
   Ether $>$ Alcohol $>$ Water

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1. A
   1 and 2 are correct
2. B
   1 and 4 are correct
3. C
   3 and 4 are correct
4. D
   All of these

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1. A
   Oxygen, Nitrogen, Sulphur
2. B
   Mercury, Iron, Gold
3. C
   Iron, Sulphur, Air
4. D
   Salt, Sugar, Chalk

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