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Naphthalene burns with a yellow sooty flame. This is because:

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Important Questions on Chemistry

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When hot water is placed into an empty water bottle, the bottle keeps its shape and does not soften. What type of plastic is the water bottle made from?

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What are the main constituents of biogas?

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Which one of the following polymers does not contain glucose units?
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In which of the following, functional group isomerism is not possible?
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The process of separation of pure water from impurities is called?
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 Very small insoluble particles in a liquid may be separated from it by using
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Desalination of seawater is done by using reverse osmosis. The pressure applied to the solution is _____.
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A solution contains 20g of solute in 180g of solvent. If the solvent is water, what is the concentration of the solution in terms of mass by mass percentage?
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Spider webs are made up of _____.
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Which one of the following proteins gives lustrous shiny appearance to silk fibre? 

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Employing Chromatography, one cannot separate _____.

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Baking powder is a mixture of_____and_____?
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The monomer/monomers used for the synthesis of Nylon 6 is/are
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Which one of the following chemical reactions is not feasible?

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Which one of the following substances do silver articles react with, that makes the silver articles black?
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Which of the following statements about the universal indicators is/are true?

  1. It is a mixture of several indicators.
  2. It shows different colours at different concentrations of hydrogen ions in the solution.
  3. It helps to determine the strength of the given acid and base in titration.

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What is the name of the process that converts sulphide ores into oxides by heating strongly in the presence of excess air?
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One carbon credit is accepted as equivalent to _____.
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The process of separation of pure water from impurities by selective boiling is called_____.
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The process of converting sugar into alcohol is called _____: