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State the term which refers to the conversion of a substance on heating from.
- solid-state to liquid state
- liquid state to vapour state
- vapour state to liquid state
- liquid state to solid-state.
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Match the characteristics of the three states of matter in List I with their correct answer from List II.
| List I | List II |
| 1. Have no definite shape, volume or free surface | A: Solids only |
| 2. Are highly compressible and least rigid | B: Liquids only |
| 3. Have a definite volume, no definite shape and are slightly diffusable | C: Gases only |
| 4. Are not compressible and have no diffusability | D: Liquids and gases only |
| 5. Have mass and occupy space | E: Solids and gases only |
| F: Solids, liquids and gases |
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Name the following:
The silvery residue obtained on heating mercury [II] oxide.
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Name the following:
The gas evolved when a dilute acid is added to chalk [limestone].
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Name the following:
Two non-metal which react explosively when brought in close contact.
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Name the following:
Two gases which react under pressure in presence of a catalyst at elevated temperatures to give a gaseous product.
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Name the following:
A catalyst which increases the rate of a chemical reaction.
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Fill in the blanks:
Matter is defined as anything that occupies _______ and has _______
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Fill in the blank:
The three states of matter are classified on the basis of differences of certain _________.
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Fill in the blank:
Particles in a gas possess ___________ kinetic energy.
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Fill in the blank:
The intermolecular force of attraction is ___________ in solids.
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Give reason for the following:
Silver salts are kept in dark coloured bottles.
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Write word equation for the following chemical reaction given below. Also state the observation seen in the case.
\[\ce{ZnCo3->[\triangle] ZnO + CO2}\]
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Give a reason for the following:
Liquids have one free upper surface only.
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Write word equation for the following chemical reaction given below. Also state the observation seen in the case.
NaCl + AgNo3 → AgCU ↓ + NaN03
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Write word equation for the following chemical reaction given below. Also state the observation seen in the case.
\[\ce{Na2SO3 + 2HCl ->[\triangle] 2NaCl + H2O + SO2}\]
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Write word equation for the following chemical reaction given below. Also state the observation seen in the case.
Pb(NO3)2 + 2NH4OH → 2NH4N03 + Pb(OH)2↓
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Write word equation for the following chemical reaction given below. Also state the observation seen in the case.
\[\ce{2SO2 + O2 ⇌[V2O5][450°C] 2SO3}\]
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Give a reason why oiling or greasing is done on the exposed moving iron parts of machinery and not preferred on heavy stationary iron parts.
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State why galvanization, tinning and chromeplating are used as three different processes for coating specific articles for prevention of rusting.
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