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प्रश्न
Give an example of double displacement reaction, where a gas is evolved.
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उत्तर
\[\ce{Na2S + 2HCI -> 2NaCI + H2S ↑}\]
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संबंधित प्रश्न
(a) What is synthesis?
(b) What kind of chemical reaction is synthesis? Support your answer by an example.
State the type of reactions for the following represent and balance the ones that are not balanced.
CuO+H2→ Cu+ H2O
What is a decomposition reaction?
Decomposition reactions can occur by electricity
Give balanced reactions.
State which of the substance given below evolve oxygen gas on thermal decomposition.
Zinc carbonate
State which of the substance given below evolve oxygen gas on thermal decomposition.
Anhydrous copper sulphate
Define the following type of chemical change or reaction with a suitable example.
Displacement reaction or substitution reaction
Give a balanced equation for the following reaction of synthesis involving the formation of:
An acid – from sulphur dioxide gas
Give a balanced equation for the following reaction of synthesis involving the formation of:
A salt – from a trivalent metal and a coloured gas.
Give a reason why zinc displaces hydrogen from dilute sulphuric acid but copper does not.
