Some precious stones such as ruby and sapphire consist of aluminum oxide coloured by traces of the oxides of

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Which of the following pieces of deposited if a current of 10A was passed through a solution of copper(ll) salt for 965 seconds?

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Chlorine is is used in water treatment as

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In which of the following changes is ∆S negative

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Sulphur burns in air to form

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What does X atand for in the following expression? X = Log(10)(H+)

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Carbon is often deposited in the exhaust-pipe of cars because of the

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Which of the following pairs illustrates isotopy?

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Alkanes are used mainly

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Trioxosulphate (lV) acid is not stored for a long period because it

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Which of the following solids has a network structure?

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Starch undergoes complete hydrolysis to produce

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