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CBSE Notes 2011-2012 » IX-Science

Is Matter Around Us Pure ?

A mixture of sulphur and carbon disulphide is

Multiple choice question

A mixture of sulphur and carbon disulphide is

Tincture of iodine has antiseptic properties. This solution is made by dissolving

Multiple choice question

Tincture of iodine has antiseptic properties. This solution is made by dissolving

Which of the following are homogeneous in nature ? (i) ice (ii) wood (iii) soil (iv) air

Multiple choice question

Which of the following are homogeneous in nature ?
(i) ice (ii) wood (iii) soil (iv) air

Which of the following are physical changes ? (i) Melting of iron metal (ii) Rusting of iron (iii) B...

Multiple choice question

Which of the following are physical changes ?
(i) Melting of iron metal
(ii) Rusting of iron
(iii) Bending of an iron rod
(iv) Drawing a wire of iron metal

Which of the following are chemical changes ? (i) Decaying of wood (ii) Burning of wood (iii) Sawing...

Multiple choice question

Which of the following are chemical changes ?
(i) Decaying of wood
(ii) Burning of wood
(iii) Sawing of wood
(iv) Hammering of a nail into a piece of wood

Two substances, A and B were made to react to form a third substance, A2B according to the following...

Multiple choice question

Two substances, A and B were made to react to form a third substance, A2B according to the following reaction
2A + B- - > A 2 B
Which of the following statements concerning this reaction are incorrect ?
(i) The product A2B shows the properties of substances A and B.
(ii) The product will always have a fixed composition.
(iii) The product so formed cannot be classified as a compound.
(iv) The product so formed is an element.

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