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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.
विकल्प
Physical
Chemical
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उत्तर
Chemical
संबंधित प्रश्न
"A substance has a definite shape as well as a definite volume." Which physical state is represented by this statement?
Give one example of the diffusion of a solid in another solid.
Give two reasons to justify that An iron almirah is a solid.
Classify the following into solids, liquids and gases.
Oxygen, milk, common salt, wax, stone, L.P.G, carbon- dioxide, sugar, mercury, coal, blood, butter, copper, coconut oil, kerosene.
Matter in any state is composed of particles. Compare the three states of matter i,e. solids, liquids, and gases with reference to:
(a) intermolecular space
(b) the intermolecular force of attraction
(c) movement of particles
Write the states of water.
Which of the following are the states of matter?
Complete the given analogy.
Solid: Definite shape:: ______: Shape of the vessel.
Match the following.
| Srl. no. | A | B | C |
| i | Separation of visible undesirable components | Water mixed with chalk powder | Magnetic Separation |
| ii | Separation of heavier and lighter components | Sand and water | Decantation |
| iii | Separation of insoluble impurities | Iron impurities | Filtration |
| iv | Separation of magnetic components from non-magnetic components | Rice and stone | Hand-picking |
| v | Separation of solids from liquids | Husk and paddy | Winnowing |
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]
