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प्रश्न
Name the following:
Two metals which give hydrogen with cold water.
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उत्तर
Sodium (Na) and Potassium (K) give hydrogen with cold water.
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संबंधित प्रश्न
Fill in the blank
Hydrogen reacts with metal oxides to form ............and....................
MULTIPLE CHOICE QUESTIONS
Hydrogen burns in oxygen to form
- hydrogen sulphide
- nitrates
- water
- ammonia
Why hot concentrated sulphuric acid is not used in the preparation of hydrogen?
Give reason for the following:
Purified and dried hydrogen is collected over mercury.
Why are the following metals not used in the lab preparation of hydrogen?
calcium
Complete and balance the equation:
[General method]
Reactions of metals with steam
Aluminium - 2Al + 3H2O → ______+ _______ [g]
Complete and balance the equation:
[General method]
Reactions of metals with dilute acids
Magnesium - Mg + 2HCl → ______+ _______ [g]
Complete and balance the equation:
[General method]
Reactions of metals - alkali [conc. soln.]
Aluminium - 2Al + 2NaOH + 2H2O → ______ + _______ [g]
2Al + 2KOH + 2H2O → _____ + _____ [g]
Select the correct answer to the reactant added, to give the product in the preparation of hydrogen gas.
\[\ce{MgO + H2}\]
Give a balanced equation for the following conversion.
\[\ce{CO + H2<-H2O->CO2 + H}\]
