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प्रश्न
Hydrogen is evolved when dilute HCl reacts with magnesium, but nothing happens in the case of mercury and silver. Explain.
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उत्तर
Hydrogen is evolved when dilute HCl reacts with magnesium which is placed above hydrogen in the activity series. However, this does not occur for metals below hydrogen such as mercury and silver. This is because only metals that are more reactive than hydrogen can displace it from HCl.
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संबंधित प्रश्न
Give reasons for the following:
Hydrogen can be used as a fuel.
Under what conditions can hydrogen be made to combine with nitrogen?
Name the products and write the equation for the reaction.
Under what conditions can hydrogen be made to combine with oxygen?
Name the products and write the equation for the reaction.
State the following pertaining to the physical properties of hydrogen: Colour & odour
State the following pertaining to the physical properties of hydrogen: Effect on moist blue litmus paper.
With reference to the uses of hydrogen, give reason for the following:
Reaction of hydrogen with nitrogen under specific conditions finds industrial utility.
Complete and balance the equation:
Conversion of hydrogen to -
Water - 2H2 + O2 → ________
Complete and balance the equation:
Conversion of hydrogen to -
Hydrogen sulphide - H2 + S → ________
Complete and balance the equation:
Hydrogen in metallurgy - reduction of
Zinc oxide - ZnO + H2 → ________ + ______
Place the metals calcium, iron, magnesium and sodium in order of their activity with water, placing the most active first. Write the equation for each of the above metals which react with Water.
