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

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1. A
   (C)
2. B
   (A)
3. C
   (D)
4. D
   (B).

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1. A
   The purity of compounds can be tested by determining their melting points.
2. B
   The mixture can be called as a single substance.
3. C
   Cesium and gallium are liquids above $30^\circ\text{C}$.
4. D
   No energy changes occur when the constituent of air tried to be mixed.

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1. A
   (i) and (iii)
2. B
   (iii) and (iv)
3. C
   (ii) and (iii)
4. D
   (i) and (ii).

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1. A
   Non - metal
2. B
   Metal
3. C
   Alloy
4. D
   Metalloid.

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1. A
   Gold
2. B
   Aluminum
3. C
   Copper
4. D
   Bromine.

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1. A
   Distilled solution
2. B
   Iodine solution
3. C
   Salt solution
4. D
   Bromine solution.

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1. A
   Dust storm
2. B
   Soap bubbles are formed by blowing air into the soap solution
3. C
   A suspension of chalk in water
4. D
   A dilute solution of alcohol in water.

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1. A
   (i) clear filtrate and no residue in A, translucent filtrate and no residue in B, sold particles as residue and clear filtrate in C.
2. B
   (i), (ii) and (iv)
3. C
   (ii) and (iii)
4. D
   (i), (ii) and (iv).

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

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1. A
   coloured spot is not visible in A, not visible in B and not visible in C.
2. B
   coloured spot is clearly seen in A, appears dim in B, not visible in C.
3. C
   coloured spot is not visible in A, appear dim in B, visible in C.
4. D
   coloured spot is visible in A, not visible in B, appear dim in C.

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1. A
   pH starts low (acidic), rises and curves upward to about 14, then plateaus high
2. B
   pH starts high (about 14) and falls, plateauing around 5
3. C
   pH rises linearly from near 0 up to 7, then stays flat at 7
4. D
   pH starts high (about 14) and falls, plateauing around 7

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1. A
   Reaction is faster in experiment II.
2. B
   Same amount of marble chips and hydrochloric acid is used for both the experiments.
3. C
   Marble chips taken in experiment II are smaller in size than the marble chips taken in experiment I.
4. D
   None of these

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1. A
   thermal decomposition of lead nitrate which produces brown fumes of nitrogen dioxide.
2. B
   thermal decomposition of lead nitrate which produces brown fumes of lead oxide.
3. C
   oxidation of lead nitrate forming lead oxide and oxygen.
4. D
   oxidation of lead nitrate forming lead oxide and nitrogen dioxide.

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1. A
   I and IV only
2. B
   III and IV only
3. C
   I and III only
4. D
   II and IV only

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1. A
   Latent heat for process I is $3.34 \times 10^{5}$ J/kg.
2. B
   Processes I, II and III are endothermic while processes IV, V and VI are exothermic.
3. C
   None of these
4. D
   Water vapours formed during process II when come in contact with skin give out $22.5 \times 10^{5}$ J/kg more heat than the boiling water.

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1. A
   Statement (iv) is correct.
2. B
   Statement (iii) is correct.
3. C
   Statement (i) is correct.
4. D
   Statement (ii) is correct.

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1. A
   I
2. B
   II
3. C
   III
4. D
   IV

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1. A
   Substance X exists in solid state at point 1, in liquid state at point 3 and in gaseous state at point 5.
2. B
   At QR, matter exists both in solid and liquid states, while at ST matter exists both in liquid and gaseous states.
3. C
   All of these
4. D
   QR represents latent heat of fusion, while ST represents latent heat of vaporisation.

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1. A
   Set-up (a) — thermometer bulb held in air above the crushed ice.
2. B
   Set-up (b) — thermometer bulb fully immersed in the crushed ice.
3. C
   Set-up (c) — thermometer bulb resting at the bottom of the container.
4. D
   Set-up (d) — thermometer laid horizontally, outside the crushed ice.

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1. A
   Q - Vaporisation, S - Liquefication, U - Solidification
2. B
   P - Melting, Q - Condensation, S - Solidification
3. C
   S - Sublimation, P - Liquefication, U - Solidification
4. D
   P - Fusion, R - Condensation, T - Sublimation

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1. A
   Brown crystals of $\text{Pb}_2\text{O}_3$, C and CO
2. B
   Shiny globules of Pb, C and Mg
3. C
   Black mass of $\text{Pb}_2\text{O}_3$, CO and Cu
4. D
   White powder of Pb, Cu and K

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1. A
   $\text{Na}_2\text{CO}_3$, $\text{CO}_2$, $\text{H}_2\text{O}$
2. B
   $\text{NaCl}$, $\text{NH}_3$, $\text{CO}_2$, $\text{H}_2\text{O}$
3. C
   $\text{NaCl}$, $\text{NaOH}$, $\text{CO}_2$, $\text{H}_2\text{O}$
4. D
   $\text{NaCl}$, $\text{Ca(OH)}_2$, $\text{H}_2\text{O}$, $\text{CO}_2$.

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1. A
   At room temperature, substance P will have fixed volume but no fixed shape.
2. B
   None of these
3. C
   At room temperature substance R will have strongest interparticle forces.
4. D
   At room temperature substance Q will have maximum space between the particles.

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1. A
   Cotton $<$ Air $<$ Exhaust from chimneys $<$ Iron $<$ Honey
2. B
   Air $<$ Cotton $<$ Exhaust from chimneys $<$ Iron $<$ Honey
3. C
   Cotton $<$ Exhaust from chimneys $<$ Honey $<$ Iron $<$ Air
4. D
   Air $<$ Exhaust from chimneys $<$ Cotton $<$ Honey $<$ Iron

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