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प्रश्न
Explain the following reaction with one suitable example of Combination reactions .
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उत्तर
Combination reactions : In this reaction two or more substances combine to form a new substance, e.g. Burning of hydrogen in air.
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संबंधित प्रश्न
Fill in the blanK
A .............is a substance which changes the rate of a chemical reaction without undergoing a chemical change.
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer.
Reduction reaction is the exact opposite of
- displacement reaction
- decomposition reaction
- oxidation reaction
- none of these
Explain the type of reactions on the basis of the direction of reaction.
Copper carbonate when heated, it turns :
Name the type of chemical reaction shown by the following equation:
2Mg + O2 → 2MgO
Out of sodium and sulphur which is a metal? Explain its reaction with the oxygen.
Explain by writing a word equation.
Hard water gets softened on mixing with a solution of washing soda.
Name: Two carbonates do not produce carbon dioxide on heating.
What do you observe when Cl2 is passed through potassium iodide (KI) solution.
Give a chemical test to distinguish between the following gases.
HCl and Cl2
Give a chemical test to distinguish between the following gases.
SO2 and Cl2
Write your observation and a balanced equation in the case of the following substances being heated.
Ammonium chloride
Name the solid residual product formed reaction and state its colour during – thermal decomposition of the following substance.
Lead nitrate.
When lithium metal is placed in hydrochloric acid, _______ gas is evolved.
Silver metal can displace hydrogen gas from nitric acid.
State whether the following statement is true or false:
When a candle burns, both physical and chemical changes take place.
Give an example of a chemical reaction for the following situation:
A change in colour is observed
Magnesium + oxygen → magnesium oxide.
2Mg + O2 → 2Mg O
Which is used as a catalyst during the process of hydrogenation of oils?
______ is the chemical name of slaked lime.
