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प्रश्न
In the following set of substances, one item does not belong to the set. Select this item and explain why it does not belong to the set :
Hydrogen, Oxygen, Steam, Chlorine
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उत्तर
Steam does not belong to the given set. While steam is a compound, all others are elements.
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संबंधित प्रश्न
Name the terms for the particles of matter which may or may not have independent existence.
Name the terms for the change of vapour into a liquid.
Define the following term of Atom .
Which type of elements, metals or non-metals, show the property of brittleness ?
Fill in the following blanks with suitable words :
Brass is an alloy which is considered a ..............
Which of the following substances are elements ?
Water, Salt, Mercury, Iron, Marble, Diamond, Wood, Nitrogen, Air, Graphite, Hydrogen, Oxygen, Sugar, Chlorine
Name a metal which forms amalgams.
Iron powder and sulphur powder were mixed together and divided into two parts A and B. When part A was heated strongly over a burner, then a substance C was formed. The part B was, however, not heated at all. When dilute hydrochloric acid was added to substance C, then gas D was evolved and when dilute hydrochloric acid was added to part B then gas E was evolved.
- What type of substance is B ?
- What type of substance is C ?
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- State one characteristic property of gas D.
- Write one test to identify gas E.
What is the name of the clear liquid formed when a solid dissolves in a liquid ?
If 25 mL of acetone is present in 150 mL of its aqueous solution, calculate the concentration of solution.
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Ink, Salt solution, Starch solution, Blood, Sugar solution
How would you obtain sodium chloride from a mixture of sodium chloride and sulphur without using water ?
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Tincture of iodine is a mixture of two materials X and Y. The material Y has a property that its solid form can be converted directly into vapours on heating by a process called Z.
- What could X be ?
- What could Y be ?
- Name the process Z.
- Which process would you use to recover both the components X and Y from tincture of iodine ?
- Which process can be used to recover only component Y from tincture of iodine ?
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 ?
Name one pair of liquids which can be separated by using a separating funnel.
Complete the given analogy.
Murukku from hot oil: ______:: Coffee powder residue from decoction: ______
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Name a non-metal which exists as a liquid at room temperature.
Gases do not diffuse very easily.
Define the term matter.
