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प्रश्न
Explain with the help of balanced equations, how precipitation reactions are used for identifying the positive radicals in three different salts, each having a different cation [positive ion].
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उत्तर
Precipitation reactions are used to identify the positive ions from their colours.
\[\ce{CuSO4 + 2NaOH->Na2SO4 + \underset{\text{pale blue ppt.}}{Cu[OH]2 v}}\]
identified ion is \[\ce{Cu^2+}\]
\[\ce{FeCl3 + 3NaOH->3NaCl + \underset{\text{reddish brown ppt.}}{Fe[OH]3 v}}\]
identified ion is \[\ce{Fe^3+}\]
\[\ce{Pb[NO3] + 2NaOH->2NaNO3 + \underset{\text{chalky white ppt.}}{Pb[OH]2 v}}\]
identified ion is \[\ce{Pb^2+}\]
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संबंधित प्रश्न
Fill in the blank:
The basic conditions necessary for a chemical reaction is _______
Give reason for the following:
Molybdenum is used in the manufacture of ammonia.
Give a word equation for the following reaction.
An exothermic reaction where both the reactants are gases, one of which is oxygen.
Match the chemical reactions in List I with the appropriate answer in List II.
| List I | List II | ||
| 1. | \[\ce{XY⇌[heat]X + Y}\] | A: | Displacement reaction |
| 2. | \[\ce{XY->X + Y}\] | B: | Double decomposition |
| 3. | \[\ce{X+Y- + A+B^-->X+B- + A+Y-}\] | C: | Endothermic reaction |
| 4. | \[\ce{X + YZ->XZ + Y}\] | D: | Thermal dissociation |
| 5. | \[\ce{X + Y->[heat]XY -\Delta}\] | E: | Decomposition reaction |
Select the correct answer from the options given below:
State the gaseous product formed, when
An ammonium salt reacts with an alkali.
______ change results in the change of the substance.
Iron benches kept in lawns and gardens get____________. It is a _________ change because a new _________ is formed.
Write word equations for two chemical reactions with the help of materials given in the box.
| Air, copper sulphate, iron, vinegar, iron oxide, carbon dioxide, iron sulphate, copper, lime water, water |
Which is used as a catalyst during the process of hydrogenation of oils?
When carbon dioxide is passed through lime water ______.
