Please select a subject first
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How will you identify?
Sulphur dioxide gas
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Name the following:
A nitrate which has no water of crystallization.
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Name the following:
A sulphate insoluble in water.
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Give two tests of the following:
NH3
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Write the steps needed for flame test ?
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Write sqauential observation for effect of heat on Lead carbonate.
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State the effect of adding a small amount of : (a) sodium hydroxide (b) ammonium hydroxide followed by an excess in case to samples of the salt solutions.
Calcium nitrate [ small amount __________ in excess __________ ]
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State the effect of adding a small amount of : (a) sodium hydroxide (b) ammonium hydroxide followed by an excess in case to samples of the salt solutions.
Zinc nitrate [ small amount ________ in excess ________]
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A solution of hydrogen chloride in water is prepared. The following substances are added to separate portions of the solution:
| S. No. | Substances added | Gas evolved | Odour |
| 1. | Calcium carbonate | _________ | _________ |
| 2. | Magnesium ribbon | _________ | _________ |
| 3. | Manganese (IV) oxide with heating | _________ | _________ |
| 4. | Sodium sulphide | _________ | _________ |
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The questions (i) to (v) refer to the following salt solutions listed A to F:
- Copper nitrate
- Iron (II) sulphate
- Iron (III) chloride
- Lead nitrate
- Magnesium sulphate
- Zinc chloride
- Which two solutions will give a white precipitate when treated with dilute hydrochloric acid followed by barium chloride solution?
- Which two solutions will give a white precipitate when treated with dilute nitric acid followed by silver nitrate solution ?
- Which solution will give a white precipitate, when either dilute hydrochloric acid or dilute sulphuric acid is added to it?
- Which solution becomes a deep/inky blue colour when excess of ammonium hydroxide is added to it ?
- Which solution gives a white precipitate with excess ammonium hydroxide solution?
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How many atoms of each kind are present in the following molecules: calcium oxide, chlorine, water, carbon tetrachloride?
How many electrons are required by each atom mentioned in (a) to attain the nearest noble gas configuration?
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How many atoms of each kind are present in the following molecules: calcium oxide, chlorine, water, carbon tetrachloride?
How many electrons are required by each atom mentioned in (a) to attain the nearest noble gas configuration?
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How many atoms of each kind are present in the following molecule:
Calcium oxide
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How many electrons are required or released by each atom in calcium oxide to attain the nearest noble gas configuration?
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Elements X, Y, and Z have atomic numbers 6, 9 and 12 respectively. Which one forms a cation?
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Elements X, Y, and Z have atomic numbers 6, 9 and 12 respectively. Which one :
State type of bond between Y and Z and give its molecular formula.
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What do you understand by redox reactions? Explain oxidation and reduction in terms of loss or gain of electrons.
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State the following is a reduction reaction or oxidation reaction.
\[\ce{Pb -> Pb^2+ + 2e-}\]
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State the following is a reduction reaction or oxidation reaction.
\[\ce{Fe^2+ - e- -> Fe^3+}\]
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State the following is a reduction reaction or oxidation reaction.
\[\ce{A^3+ + e- -> A^2+}\]
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