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प्रश्न
Distinguish by heating the following in dry test tubs.
Copper Sulphate and copper carbonate
उत्तर
| Copper sulphate | Copper carbonate | |
| Residue left | Anhydrous(CuSO4) | Copper oxide(CuO) |
| Colour of residue | The colour of the residue is Dirty white. | The colour is black solid. |
| Gas produced | Water vapour (H2O) is produced. | Carbon dioxide(Co2) is produced. |
APPEARS IN
संबंधित प्रश्न
Changes in which new substances are formed are called ______ changes.
Define catalyst.
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer
Which of the following is a reducing agent?
- oxygen
- chlorine
- hydrogen
- none of these
Out of sodium and sulphur which is a metal? Explain its reaction with the oxygen.
What do you understand by precipitation reaction? Explain with examples.
State the original colour of the following substance and colour of residue obtained after heating.
Ammonium dichromate
What do you observe when Cobalt chloride paper is introduced in water vapour.
Give a chemical test to distinguish between the following gases.
NH3 and HCl
Complete the table given below.
| Heat on iodine crystals | Colour of vapours evolved |
The chemical change is ______.
_____ is the basic material to manufacture urea.
______ change results in the change of the substance.
Which of the following are chemical changes?
(i) Decaying of wood
(ii) Burning of wood
(iii) Sawing of wood
(iv) Hammering of a nail into a piece of wood
Which of the following statement is incorrect for a chemical reaction?
Write a note on the following:
Fermentation
Write the characteristics of chemical change.
When milk is mixed with coffee decoction, the colour of milk and decoction changes due to ______.
