Please select a subject first
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Fill in the blank:
_____________ discovered the oxygen gas.
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Match the statements in Column A, with those in Column B.
| Column A | Column B |
| 1. Largest Constituent of air, which dilutes the activity of oxygen. |
(a) Oxygen |
| 2. A gas used for filling weather observation balloons. | (b) carbon acid |
| 3. An acid formed by the dissolution of sulphur dioxide gas in water. | (c) Sulphur acid |
| 4. An acid formed by the dissolution of carbon dioxide in water. | (d) Helium |
| 5. A gas vital for respiration. | (e) Nitrogen |
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Elements X and Y have 1 and 7 electrons in their outermost shell respectively.
Which element will lose electron?
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Elements X and Y have 1 and 7 electrons in their outermost shell respectively.
Which element will gain electron?
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Elements X and Y have 1 and 7 electrons in their outermost shell respectively.
Which will form positive ion?
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Elements X and Y have 1 and 7 electrons in their outermost shell respectively.
Which will form negative ion?
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Elements X and Y have 1 and 7 electrons in their outermost shell respectively.
What will be the charge present of the molecule XY after chemical combination?
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Explain the term ‘chemical reaction’ with special reference to – ‘reactants’ and ‘products’.
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Represent the addition of dilute sulphuric acid to zinc by means of a chemical equation. State the function of the arrow between the reactants and products.
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Explain the meaning of the term matter with special reference to the term ‘substance’.
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Explain the meaning of the term matter with special reference to the term ‘substance’.
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Give examples of exothermic reactions i.e. heat evolved in each of the following:
(a) reaction between a solid and a liquid
(b) reaction between two gases
Give two examples of exothermic reactions seen in everyday life.
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Select the correct answer for the following options:
The black residue obtained on heating copper carbonate.
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Select the correct answer for the following options:
The basic gas obtained when two gases react in presence of a catalyst and the reaction is exothermic.
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Select the correct answer for the following options:
The gas obtained when potassium chlorate is heated in the presence of a catalyst.
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Select the correct answer for the following options:
The gas which reacts with oxygen to give a neutral liquid.
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Select the correct answer for the following options:
The pale blue precipitated obtained when copper [II] sulphate reacts with sodium hydroxide.
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Give a word equation for the following reaction.
Two solids which combine on heating, to give a liquid.
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Give a word equation for the following reaction.
Two gases which combine to give a solid.
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Give a word equation for the following reaction.
A compound which on heating shows – colour change from brown to yellow.
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