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CBSE Notes 2011-2012 » IX-Science

Is Matter Around Us Pure ?

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.

Two chemical species X and Y combine together to form a product P which contains both X and Y ...

Multiple choice question

Two chemical species X and Y combine together to form a product P which contains both X and Y
X + Y ---> P
X and Y cannot be broken down into simplersubstances by simple chemical reactions. Which of
the following concerning the species X, Y and P are correct ?
(i) P is a compound
(ii) X and Y are compounds
(iii) X and Y are elements
(iv) P has a fixed composition

Which of the following has the highest solubility at 313 K?

Multiple choice question

Which of the following has the highest solubility at 313 K?

Mixture of ammonium chloride and sodium chloride can be separated by

Multiple choice question

Mixture of ammonium chloride and sodium chloride can be separated by

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