Advertisements
Advertisements
प्रश्न
Which of the following are ‘pure substances’ ?
Ice, Milk, Iron, Hydrochloric acid, Calcium oxide, Mercury, Brick, Wood, Air
उत्तर
Iron and mercury are pure substances because these are elements. Hydrochloric acid, calcium oxide, and ice are also pure substances, as they are compounds.
APPEARS IN
संबंधित प्रश्न
The inter-molecular space is maximum in
Solids have definite shape and definite volume.
Differentiate between an atom and a molecule.
Name the property which enables metals to be drawn into wires.
Which of the following substances are elements ?
Water, Salt, Mercury, Iron, Marble, Diamond, Wood, Nitrogen, Air, Graphite, Hydrogen, Oxygen, Sugar, Chlorine
Classify the following into elements, compounds and mixtures :
arble, Air, Gold, Brass, Sand, Diamond, Graphite, Petroleum, Common salt, Sea-water, Chalk
Out of a colloid, solution and a suspension :
which one has the largest particles ?
Which of the two will scatter light : soap solution or sugar solution ? Why ?
A solution contains 5.6 mL of alcohol mixed with 75 mL of water. Calculate the concentration of this solution.
Milk of Magnesia is :
State whether the following statement are true or false :
Alcohol can be separated from a mixture of alcohol and water by a separating funnel.
Name the source from which nitrogen and oxygen are obtained on a large scale.
How will you separate a mixture of iron filings and powdered carbon ?
Describe the various steps involved in the separation of iodine, iron filings and salt from a mixture.
Draw a labelled diagram of the fractional distillation apparatus used for separating a mixture of alcohol and water.
Explain how, nitrogen , oxygen and argon gases are separated from air.
A solid mixture contains four constituents P, Q, R and S. P consists of tiny grains and it is mixed with
cement for plastering the walls. Q is a white solid which is recovered on a large scale from sea water by the
process of evaporation. R is in the form of tiny particles of a material whose corrosion is called rusting. And
S is a white solid which is used in making ordinary dry cells.
- What could P, Q, R and S be ?
- How would you separate a mixture containing P, Q, R and S ?
Differentiate between the-two characteristics of matter – ‘mass’ & ‘weight’.
Write a few lines on the blackboard with a chalk. Now observe the chalk. What changes do you see in the chalk?
Asmita went to buy an earthen pot. There she saw many things kept for sale.
What is the difference between a substance and an object?
