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प्रश्न
Select the correct answer from the options given below:
State the gaseous product formed, when
An active metal reacts with dilute sulphuric acid.
पर्याय
Ammonia
Hydrogen chloride
Hydrogen
Nitrogen dioxide
Nitric oxide
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उत्तर
Hydrogen
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संबंधित प्रश्न
Write true or false .
A black residue is formed when sugar is heated .
When hydrogen burns in oxygen, water is formed; when electricity is passed through water, hydrogen and oxygen are given out. Name the type of chemical change involved in the two cases.
Complete and balance the following reaction:
NaCl(aq) + AgNO3(aq) →
Distinguish by heating the following in dry test tubs.
Copper Sulphate and copper carbonate
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 dilute acid to an active metal.
Give balanced equation for the following conversion affected by heat alone on the substance:
Hydrated copper sulphate to sulphur dioxide
Complete the table given below.
| Flame test for calcium chloride | Acid used for flame test |
Give a balanced equation for a reaction involving the evolution of gas on the addition of dilute acid to calcium carbonate.
Write five changes in the characteristics of a substance that can take place during a chemical change.
Collect information about the types of fuels used for cooking in your area. Discuss with your teachers/parents/others which fuels are less polluting and why.
