ICSE ICSE Class 8 - CISCE Question Bank Solutions

Draw the structure of the following atoms showing the nucleus containing – protons, neutrons and the orbits with the respective electron:

Sodium [At. no. = 11, Mass no. = 23]

Draw the structure of the following atoms showing the nucleus containing – protons, neutrons and the orbits with the respective electron:

Isotopes of hydrogen [1₁H, 2₁H, 3₁H]

Differentiate between:
pure and impure substances

Write the Chemical Name of the Following and Also Give Their Molecular Formulae:

Baking Soda

How is sodium chloride different from its constituent elements ?

Why is iron sulphide a compound ?

Suggest a suitable technique to separate the constituents of the following mixtures. Also give the reason for selecting the particular method.

Salt from sea water

What is chromatography? For which type of mixture is it used?

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A mixture of sand and ammonium chloride can be separated by

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 A pair of metalloids are

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 Which of the following property is not shown by compounds?

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Which of the gas is highly soluble in water ?

Fill in the blank

Mixtures can be ...................... or .....................

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................. is used when the constituents of a mixture of solids have difference in their weights

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Iodine, camphor, naphthalene, ammonium chloride and dry ice are some substances that ....................................

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The methods of separating components of a given mixture are based on the

1. physical properties and state of the components.
2. colour of the components only.
3. state of the components.
4. none of these

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 The different constituents of ink are separated by

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A ________ substance has only one kind of matter.

A _______ is formed when one liquid is dispersed as tiny droplets throughout another liquid

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Immiscible liquids are separated by using a ________.