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प्रश्न
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.
An efflorescent substance which leaves a residue having the same colour as the substance and evolves a gas which changes the colour of cobalt chloride paper.
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उत्तर
Washing soda Na2CO3.10H2O Efflorescent substance.
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संबंधित प्रश्न
Fill in the blank
Hydrogen is ..................... than air.
Fill in the blank
Hydrogen is ...................soluble in water.
Fill in the blank
Hydrogen reacts with metal oxides to form ............and....................
For laboratory preparation of hydrogen, give the following:
chemical equation
Give reason for the following:
Dilute sulphuric acid cannot be replaced by concentrated acid in the preparation of hydrogen.
Complete and balance the following reaction.
Zn + HCl →_____________ +___________
Complete and balance the equation:
[General method]
Reactions of active metals - cold water
Sodium - 2Na + 2H2O → ______+ _______ [g]
Complete and balance the equation:
[General method]
Reactions of metals - alkali [conc. soln.]
Aluminium - 2Al + 2NaOH + 2H2O → ______ + _______ [g]
2Al + 2KOH + 2H2O → _____ + _____ [g]
State the condition and give balanced equation for the conversion of water gas to hydrogen – in the Bosch process.
Select the correct answer to the reactant added, to give the product in the preparation of hydrogen gas.
\[\ce{Fe3O4 + H2}\]
