ICSE ICSE Class 8 - CISCE Question Bank Solutions for Chemistry

Give reason for the following:

In the preparation of hydrogen by electrolysis of water – the distilled water used is acidified.

Select the correct options for the following statement:

A metal which reacts with water to give a metallic hydroxide & liberate hydrogen.

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The metal used as a catalyst in hydrogenation of oils.

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The metal which reacts with steam liberating hydrogen & the reaction is reversible.

Select the correct options for the following statement:

The metallic compound formed when a metal above aluminium in the activity series reacts with steam.

Select the correct options for the following statement:

The acid _____ is not Used in the laboratory preparation of hydrogen, using zinc and an acid.

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A foul smelling gas formed when hydrogen reacts with a molten non-metal, is ___.

Select the correct options for the following statement:

The product formed on combustion of hydrogen in air is ___.

State in which of the following examples ie. a piece of wood, water, light gas is the Inter-particle space maximum.

State in which of the following examples ie. a piece of wood, water, light gas is the Inter-particle attraction maximum.

State in which of the following examples ie. a piece of wood, water, light gas is the Energy possessed by particles of matter, very large.

‘Inter-particle attraction between atoms of gases is very weak’. State five properties of gases which correlate as a consequence of the weak inter-particle attraction between particles of gases.

In which of the three states of matter – solids, liquids, or gases is the movement of atoms about their own position. Give a reason for the same.

State the ‘law of conservation of mass’.

Complete the statement given below by filling in the blanks with the correct words.

Atoms contain ________ with positively charged ________.

State the main points of Landolt’s experiment for experimental evidence of the law. 

Select the correct answer from A, B, C, D & E for the statement given below:

In Landolt’s experiment – the form in which the chemical energy stored up in the reactants __________ is released.

Select the correct answer from A, B, C, D & E for the statement given below:

The process of change of a liquid into vapour, [gas] on heating.

Select the correct answer from A, B, C, D & E for the statement given below:

The state of matter, where the inter-particle attraction between particles is maximum.

With reference to the liquid state of matter – answer the following

How does the stored energy, have an effect on inter-particles space.