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प्रश्न
Give a reason why zinc displaces hydrogen from dilute sulphuric acid but copper does not.
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उत्तर
Zinc (more electropositive) and being above [H] inactivity series displace hydrogen from dilute sulphuric acid but copper is below [H] in electrochemical series cannot displace hydrogen from sulphuric acid.
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संबंधित प्रश्न
Explain, giving one example of the following chemical changes:
Double decomposition
What is a double displacement reaction?
Give an example of double displacement reaction, where a gas is evolved.
Decomposition reactions can occur by heat.
Give two balanced reactions for each.
On heating which of the following substances i.e. copper carbonate, zinc carbonate, washing soda, copper sulphate, zinc nitrate, copper nitrate, lead nitrate, ammonium chloride and ammonium dichromate – relate to the reaction given below.
A coloured substance which decomposes violently leaving a coloured residue and evolving two neutral gases one of which is unreactive or inert in nature.
State which of the substance given below evolve oxygen gas on thermal decomposition.
Washing soda
State which of the substance given below evolve oxygen gas on thermal decomposition.
Lead nitrate
Complete the statement by filling in the blank with the correct word:
Direct combination reaction of sulphur dioxide with water gives ________.
Give a balanced equation for the following type of reaction:
A thermal decomposition reaction of a salt – which results in the formation of nitrogen gas.
Differentiate between the following:
Decomposition reaction and a double decomposition reaction.
