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प्रश्न
Distinguish by heating the following in dry test tubs.
Zinc nitrate and copper nitrate.
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उत्तर
| Zinc nitrate | Copper nitrate | |
| Residue left | Zinc oxide(ZnO) | Copper oxide(CuO) |
| Colour of residue | Yellow when hot and White when cold | Black Solid |
| Gas produced | The gas produced is Nitrogen dioxide and oxygen(NO2 + O2) | The gas produced is Nitrogen dioxide and oxygen(NO2 + O2) |
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संबंधित प्रश्न
TRUE \ FALSE
Evaporation of water is a physical change. True or false ?
Fill in the blank.
Melting of ice is a _______ change.
Fill in the blank:
During a chemical reaction transfer of ________ takes place.
| Reactants | Products | Type of chemical reaction |
| BaCl2(aq) + ZnSO4(aq) | H2CO3(aq) | Displacement |
| 2AgCl(s) | FeSO4(aq) + Cu(s) | Combination |
| CuSO4(aq) + Fe(s) | BaSO4↓ + ZnCl2(aq) | Decomposition |
| H2O(l) + CO2(g) | 2Ag(s) + Cl2(g) | Double displacement |
Complete the statement by filling the gap using an appropriate term from the terms given in the bracket.
(slow, coloured, arrow, fast, smell, milky, physical, product, chemical, reactant, covalent, ionic, octet, duplet, exchange, sharing, equality sign)
An ______ is drawn in between the reactants and products while writing the equation for a chemical reaction.
Give an example of a reaction where the following are involved
Light
Burning of paper is a ______ change.
The changes in which new substance with new chemical properties are formed are ______.
Give an example where heat, light, and sound are produced during a chemical change.
What is thermochemical reactions?
