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प्रश्न
Give balanced equation for the following conversion affected by heat alone on the substance:
Zinc nitrate to nitrogen dioxide
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उत्तर
Action of heat on:
\[\ce{\underset{\text{White}}{2Zn[NO3]2} -> \underset{\text{yellow - hot white - cold}}{2ZnO} + \underset{\text{Nitrogen dioxide}}{4NO2} + O2}\]
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संबंधित प्रश्न
How do the following help in bringing about a chemical change?
light.
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer.
Reduction is a chemical reaction in which there is
- removal of hydrogen
- removal of oxygen
- addition of oxygen
- none of these
Write true or false.
A chemical equation gives only qualitative information of a chemical reaction.
Balance the following equation :
Fe + H2O → Fe3O4 + H2
Show with the help of diagram of electronic configuration how the following compound is formed from the constituent atoms.
Potassium fluoride
Complete and balance the following reaction:
\[\ce{NH3 + O2 ->[\Delta]}\]
A chemical reaction is often accompanied by external indications or characteristics which include –
- Colour change
- Effervescence or gas evolved
- Evolution or absorption of heat
- Formation of a precipitate.
With reference to each of the above indications, state the external indication seen during – Addition of water to quicklime.
Complete the table given below.
| Addition of dil. H2SO4 to zinc | Test for gas evolved |
On heating calcium carbonate gets converted into calcium oxide and carbon dioxide.
(a) Is this a physical or a chemical change?
(b) Can you prepare one acidic and one basic solution by using the products formed in the above process? If so, write the chemical equation involved.
Write five changes in the characteristics of a substance that can take place during a chemical change.
