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प्रश्न
Account for the following fact:
Potassium and sodium are not used to react with dilute ‘hydrochloric acid or dilute sulphuric acid in the laboratory preparation of hydrogen.
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उत्तर
Sodium and potassium with dil. HCl or dil. H2SO4 but reaction is highly explosive and practically not-feasible.
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संबंधित प्रश्न
TRUE \ FALSE
reacts with hot water to form copper oxide and hydrogen.
Give reason for the following:
The end of the thistle funnel should be dipped under acid.
How did the name 'hydrogen' originate?
Complete and balance the following reaction.
Zn + H2O →_____________ +___________
State how hydrogen occurs in the free state. Name three compounds containing hydrogen in the combined state.
‘Hydrogen is obtained by electrolysis of acidified water’.
Answer the following pertaining to the preparation of hydrogen by electrolysis,
Name the electrode –
- through which the current enters the electrolyte.
- at which hydrogen is liberated.
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 white substance which leaves an amphoteric oxide as a residue [whose colour varies in the heated and in the cold state] and evolves a gas which turns lime water milky.
Name an element whsich reacts violently with water at room temperature.
Select the correct answer to the reactant added, to give the product in the preparation of hydrogen gas.
\[\ce{Al2(SO4)3 + H2}\]
Select the correct answer to the reactant added, to give the product in the preparation of hydrogen gas.
\[\ce{NaAlO2 + H2}\]
