Advertisements
Advertisements
Question
Fill in the following blanks with suitable words :
The gases of air can be separated by fractional distillation of liquid air because they have different..............
Advertisements
Solution
The gases of air can be separated by fractional distillation of liquid air because they have different boiling points.
APPEARS IN
RELATED QUESTIONS
The inter-molecular space is maximum in
Name the processes involved in two cases.
Name the terms for the particles of matter which may or may not have independent existence.
Which of the following is a mixture ?
Salt, Air, Water, Alum, Sugar
What is meant by saying that metals are sonorous ?
The three important metalloids are.............................. and ..........................
Give reason why graphite is used for making elecrode in a dry cell.
“Is malleable and ductile” best describes :
Which one of the following is not a metalloid ?
There are three substances X, Y and Z. The substance X does not have a fixed melting point or boiling point and it still shows the individual properties of its constituents. The substance Y is a pure substance which occurs in nature as such. The substance Y has a fixed melting point and boiling point but it cannot be broken down into simpler substances by any chemical means. The substance Z is also a pure substance whose properties are entirely different from those of its constituents. The substance Z can, however, be divided by electrolysis into two substances which belong to the same class of substances as Y.
- What type of substance could X be ? Name one substance like X.
- What type of substance could Y be ? Name one substance like Y.
- What type of substance could Z be ? Name one substance like Z.
- Which process involves absorption or release of an appreciable amount of energy : formation of substance X or formation of substance Z ?
- Name the three groups into which all the substances like Y are divided on the basis of their properties.
Choose the correct answer.
A 5 per cent sugar solution means that :
Name the process which is used in milk dairies to separate cream from milk.
How will you separate a mixture of iron filings and powdered carbon ?
How will you separate water from mustard oil ?
Differentiate between the-two characteristics of matter – ‘mass’ & ‘weight’.
If there is a sudden shower, we take shelter under a roof at the roadside. Even though the rain does not fall on us directly, we get wet to some extent. Why ?
Which of the following statements are true for pure substances?
(i) Pure substances contain only one kind of particles
(ii) Pure substances may be compounds or mixtures
(iii) Pure substances have the same composition throughout
(iv) Pure substances can be exemplified by all elements other than nickel
Atoms are tiny particles that repel each other when they are squeezed very close.
The pressure of gases does not depend on the temperature of the gas and the volume it occupies.
Evaporation is always accompanied by ______ in temperature.
