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Question
Why are there gaps at regular intervals between consecutive rails in a railway track? State the relation between linear expansion coefficient (α),…
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How many grams of CaCO₃ will react with excess of dilute HCl to produce 66 g of CO₂? [Ca = 40, C…
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In a closed vessel, 1 g of magnesium is burnt with 0.5 g of oxygen gas. Which reactant remains in excess? Find…
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State Avogadro’s law. Use simple calculation to show that moist air is lighter than dry air. [1+2]
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Write the structural formulae of 1,2-dibromoethane and 1,1,2,2-tetrabromoethane. Write the name of the organic compound which is produced when ethyl alcohol is…
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Mention one use of CNG. Discuss one each of the harmful effects of methanol and ethanol. [1+2]
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Write with balanced chemical equation, what happens when hydrogen sulphide is passed through aqueous solution of lead nitrate.
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What materials are used as cathode, anode and electrolyte during electroplating of a brass spoon with nickel?
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Explain the position of hydrogen in the modern periodic table. Which group of the periodic table contains solid, liquid and gaseous elements?…
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State Modern Periodic Law. Discuss the periodic trends of atomic radii for elements of Group 1 to 2 and Group 13 to…
