1. A
   At $-100^\circ\text{C}$, X exists in solid state.
2. B
   At $100^\circ\text{C}$, X exists in gaseous state.
3. C
   At $0^\circ\text{C}$, X exists in liquid state.
4. D
   All of these

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1. A
   Increases continuously
2. B
   Increases continuously
3. C
   Decreases up to $4^\circ\text{C}$ and increases further
4. D
   Decreases up to $4^\circ\text{C}$ and increases further

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1. A
   Copper is below hydrogen but above lead
2. B
   Iron is below lead and zinc
3. C
   Zinc is below magnesium but above aluminium
4. D
   Magnesium is below calcium but above aluminium

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1. A
   100 K
2. B
   1000 K
3. C
   $1074$ K
4. D
   1047 K

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1. A
   Washing soda
2. B
   Blue vitriol
3. C
   Baking soda
4. D
   Gypsum

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1. A
   Conc. $\text{HNO}_3$
2. B
   Dil. $\text{HNO}_3$
3. C
   Both have same $\text{H}^+$ ion concentration
4. D
   No $\text{H}^+$ ion is present in $\text{HNO}_3$

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1. A
   Turmeric
2. B
   Phenolphthalein
3. C
   Universal indicator
4. D
   Litmus paper

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1. A
   $\text{HNO}_3$
2. B
   $\text{NaOH}$
3. C
   $\text{HCl}$
4. D
   $\text{H}_2\text{SO}_4$

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1. A
   $\text{HCl}$, $\text{Mg(OH)}_2$
2. B
   Lactic acid, $\text{Mg(OH)}_2$
3. C
   Amino acids, $\text{Ca(OH)}_2$
4. D
   $\text{HCl}$, $\text{Ca(OH)}_2$

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1. A
   Option (c)
2. B
   Option (b)
3. C
   Option (a)
4. D
   Option (d)

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1. A
   After washing with plenty of water apply solution of sodium hydroxide on the hand
2. B
   Neutralize the acid with a strong alkali
3. C
   Wash the hand with saline solution
4. D
   Wash the hand immediately with plenty of water and apply a paste of sodium hydrogen carbonate.

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1. A
   base
2. B
   alkali
3. C
   salt
4. D
   compound.

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1. A
   The matchstick continued to burn brilliantly.
2. B
   The matchstick extinguished and the gas burnt with pop sound.
3. C
   The matchstick burnt slowly with a blue flame.
4. D
   The matchstick extinguished and the gas burnt with no sound.

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1. A
   $\text{H}_2\text{SO}_4$
2. B
   $\text{H}_2\text{S}_2\text{O}_3$
3. C
   $\text{HSO}_4$
4. D
   $\text{H}_2\text{SO}_3$

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1. A
   Limestone
2. B
   distilled water
3. C
   Gypsum
4. D
   Slaked Lime.

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1. A
   Blue litmus remains blue and red litmus remains red.
2. B
   Blue litmus turn red and red litmus remains red.
3. C
   Blue litmus turn red and red litmus turns blue.
4. D
   Blue litmus remains blue and red litmus turns blue.

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

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1. A
   $2\text{CaSO}_4\cdot\text{H}_2\text{O}$
2. B
   $\text{CaSO}_4\cdot\frac{1}{2}\text{H}_2\text{O}$
3. C
   $\text{CaSO}_4\cdot 2\text{H}_2\text{O}$
4. D
   $\text{CaSO}_4\cdot\text{H}_2\text{O}$

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1. A
   Phenolphthalein
2. B
   Methyl Orange
3. C
   Universal Indicator
4. D
   Litmus

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1. A
   Baking powder
2. B
   Ammonium hydroxide solution
3. C
   Hydrochloric acid
4. D
   Lime.

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1. A
   $\text{Fe}_3\text{O}_4$
2. B
   $\text{Fe}_2\text{O}_3$
3. C
   $\text{FeO}$
4. D
   $\text{Fe}_2\text{O}_3$ and $\text{Fe}_3\text{O}_4$.

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1. A
   Weak base
2. B
   Strong base
3. C
   Weak acid
4. D
   Strong acid.

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1. A
   Basic oxide
2. B
   Amphoteric oxide
3. C
   Neutral oxide
4. D
   Acidic oxide.

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1. A
   an analgesic is used
2. B
   an antacid is used
3. C
   an antiseptic is used
4. D
   an antipyretic is used.

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1. A
   an alcohol
2. B
   distilled water
3. C
   hydrochloric acid
4. D
   sodium hydroxide solution.

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