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प्रश्न
A kind of matter which can sublime is
पर्याय
water
plastic
milk
iodine
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उत्तर
iodine
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संबंधित प्रश्न
What are the two conditions for the interconversion of states of matter ?
Name one solid, one liquid and one gaseous non-metal.
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.
Calculate the concentration of a solution which contains 2.5 g of salt dissolved in 50 g of water.
Explain what happens when a beam of light is passed through a colloidal solution.
100 mL of water at room temperature of 25°C is taken in a beaker and a little of solid S is dissolved in it by stirring to obtain a solution X. More and more of solid S is added to the solution with constant stirring, while keeping the temperature of solution constant at 30°C. After some time it is observed that no more solid dissolves in water and at the same time some solid is also left undissolved at the bottom of the beaker.
- The contents of beaker are filtered through a filter paper to obtain solution Y in the form of a filtrate.
- What name is given to solutions like X ?
- What name is given to solutions like Y ?
- What will you observe if the solution Y at 30°C is cooled down to 10°C by keeping the beaker in crushed ice ? Why ?
- What term is used to denote the amount of solid dissolved in 100 grams of water in a solution lie Y ?
Name the property of one of the constituents which can be used to separate a mixture of salt and iodine
Name the source from which nitrogen and oxygen are obtained on a large scale.
Name the process which can be used to recover salt from an aqueous salt solution.
Name the process you would use to separate a mixture of water and alcohol.
Fill in the following blanks with suitable words :
The separation of liquids by fractional distillation is based on the difference in their .....................
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..............
Describe the various steps involved in the separation of iodine, iron filings and salt from a mixture.
Explain how, impure copper sulphate can be purified by crystallisation.
The material which is added to water during purification process at the water works so as to disinfect it is :
The given mixture contains three constituents A, B and C. The constituent A is a yellow coloured, solid element which dissolves in a liquid D. The constituent B is a blue coloured salt which is insoluble in liquid D but dissolves easily in another liquid E. The constitudent C is a liquid which is used in cooking food and forms a solid fat on hydrogenation.
(a) What do you think could (i) constituent A, and (ii) liquid D be ?
(b) What could (i) constituent B, and (ii) liquid E be ?
(c) What could liquid C be ?
(d) How will you separate the mixture containing A, B and C ?
Solids possess very high kinetic energy.
Boiling refers to the process by which a substance changes from the liquid to the gaseous state at its ______ point.
Give an example of a molecule.
Define the term matter.
