Please select a subject first
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When a compound loses its water of crystallisation on exposure to dry air.
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Hot saturated solution of sodium nitrate forms crystals as it cools. Why?
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On the basis of Thomson's model of an atom explain how an atom as a whole is neutral.
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Which sub-atomic particle was discovered by Thomson?
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Match the following:
| Column A | Column B |
| (a) Pb(NO3)2 | (i) rotten eggs smell |
| (b) CO2 | (ii) burns with a pop sound |
| (c) (NH4)2Cr2O7 | (iii) the suffocating smell of sulphur |
| (d) HCI | (iv) lime water turns milky |
| (e) NO2 | (v) crackling sound |
| (f) O2 | (vi) residue swells up |
| (g) H2 | (vii) brown gas |
| (i) H2S | (viii) supports combustion |
| (j) SO2 | (ix) fumes with NH3 solution |
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What is a chemical formula? What is the significance of a formula?give an example to illustrate?
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Name a salt which contain of crystallization.
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Name a salt which does not contain water of crystallization.
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What is ‘water of crystallization’ ? Name a crystalline salt which does not contain water of crystallization.
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What would you observe, when the water of crystallization of a salt Is removed by heating it.
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What is meant by the term crystallization?
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What is meant by the term seed crystal.
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Define the term ‘water of crystallization’.
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XCl2 is the chloride of a metal X. State the formula of the sulphate and the hydroxide of the metal X.
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The formula of the nitride of a metal X is XN, state the formula of :
- its sulphate
- its hydroxide.
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Name the element in the compound and give the formula of the following compound:
Nitric acid
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Name the element in the compound and give the formula of the following compound:
Carbonic acid
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Name the element in the compound and give the formula of the following compound:
Phosphoric acid
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Name the element in the compound and give the formula of the following compound:
Acetic acid
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