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प्रश्न
State the property of the following substance.
Manganese dioxide, a catalyst which alters the rate of a chemical reaction is black in colour.
पर्याय
Physical
Chemical
उत्तर
Chemical
संबंधित प्रश्न
What are molecules?
Give one difference between atoms and molecules.
Give reasons
When a teaspoon of sugar is added to half a glass of water and stirred, the water level in the glass remains unchanged.
Give reasons
A red ink drop added to small amount of water in a glass turns the water red in some time.
For the following statement, say whether it describes a solid, a liquid or a gas.
Particles move about very quickly but do not leave the surface
State the property of the following substance.
The melting point of ice is 0°C.
See the given pictures and write down the state of each object. (Solid, Liquid, Gas)
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| _____ | ______ | ______ | ______ | ______ |
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| ______ | _______ | ______ | ______ | ______ |
Complete the given analogy.
Solid: Rigidity:: Gas: ______
The tendency of particles to spread out in order to occupy the available space is ______.
The density of solid Argon is 1.6 ml at - 233°C. If the Argon atom is assumed to be sphere of radius 1.5 × 10-8 cm, then the ______ % of solid Argon is apparently occupied.
[Take : NA = 6 × 1023, Atomic mass of Ar = 40]
