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प्रश्न
Give reason for the following:
Blue solution of copper sulphate changes to green when a piece of iron is added to this solution.
उत्तर
This is because the blue colour of the copper sulphate solution fades and eventually turns into light green due to the formation of ferrous sulphate.
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संबंधित प्रश्न
Define precipitation.
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer.
Miscible liquids having slightly different boiling points can be separated by the
- evaporation
- distillation
- fractional distillation
- sedimentation
TRUE \ FALSE
A precipitation reaction takes place only in a solution.
Fill in the blank.
Melting of ice is a _______ change.
Give an example of a reaction where the following are involved
Catalyst
Give reason for the following:
Molybdenum is used in the manufacture of ammonia.
Complete and balance the following reaction:
\[\ce{NH3 + O2 ->[\Delta]}\]
Select the correct answer for the following options:
The pale blue precipitated obtained when copper [II] sulphate reacts with sodium hydroxide.
What is a chemical reaction?
On heating which of the following substances i.e. copper carbonate, zinc carbonate, washing soda, copper sulphate, zinc nitrate, copper nitrate, lead nitrate, ammonium chloride and ammonium dichromate – relate to the reaction given below.
A white solid which evolves two colourless gases which on cooling combine and condense on the cooler parts of the test tube.
Give balanced equation for the following conversion affected by heat alone on the substance:
Zinc carbonate to zinc oxide
Complete the table given below.
| Addition of dil. H2SO4 to zinc | Test for gas evolved |
Give a suitable example with an equation to show the representation of a chemical reaction.
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].
Name the solid residual product formed reaction and state its colour during – thermal decomposition of the following substance.
Lead nitrate.
What is the role of a catalyst in a chemical reaction?
The water we drink is a combination of hydrogen and oxygen.
When magnesium is burnt in the air, a new substance is formed which is ______.
______ is the chemical name of limestone.
