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What is variable valency ? Give two examples of elements showing variable valency.
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A solution of a substance ‘X’ is used for white washing.
(a) Name the substance ‘X’ and write its formula.
(b) Write the reaction of the substance ‘X’ named in (a) above with water.
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How do the solubility of a solid and a gas affected by Increase in temperature.
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Give two example of Solvent other than water.
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Give reason for Table salt becomes moist during rainy season.
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Write the molecular formulae of Iron (III) chloride
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Write the molecular formulae of Sodium hydroxide
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Write the molecular formulae of Iron (II) sulphide.
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Write the molecular formulae of Lead (II) oxide – PbO.
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Write the molecular formulae of Hydrogen nitrate (nitric acid).
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Write the molecular formulae of Hydrogen sulphate (sulphuric acid).
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Write the molecular formulae of Calcium hydroxide.
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Write the molecular formulae of Magnesium carbonate.
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Write the molecular formulae of Ammonium carbonate.
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Discuss the importance of water as a solvent for our body .
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Discuss the importance of water as a solvent for plants.
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What do you mean by solubility of a solute in a solvent ?
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Give a reason why water is called a ‘universal solvent’ but, an alkali is not.
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