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Is matter around us pure? Part-2


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Q.1 : There are 22 non-metal. In which 6 non-metal, Helium Neon Argon Krypton Xenon and Radon are chemically inactive gases. These are also called:
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Q.2 : Which is the lightest element?
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Q.3 : Elements from atomic number 83 to atomic number 112 and 114 116 and 118 are radioactive in nature.
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Q.4 : In case of mixtures the constituents are present in fixed ratio by weight.
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Q.5 : The main constituent of air can be separated by:
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Q.6 : Colloidal solution can be separated by the process of:
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Q.7 : Which separation technique is suitable for the separation of dye from blue black ink?
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Q.8 : Which of the following substances when mixed with sand cannot be separated by sublimation?
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Q.9 : Carbon burns in oxygen to form carbon dioxide. The properties of carbon dioxide are:
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Q.10 : Which of the following is not a chemical change?
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