Advertisements
Advertisements
प्रश्न
Explain the reactions of nonmetals with water with the help of examples.
उत्तर
Generally, nonmetals do not react with water, except halogens.
E.g. Chlorine on dissolving in water gives the following reaction:
\[\ce{\underset{\text{Chlorine}}{Cl_{2(g)}} + \underset{\text{Water}}{H2O_{(l)}} -> \underset{\text{acid}}{\underset{\text{Hypochlorous}}{HOCl_{(aq)}}} + \underset{\text{acid}}{\underset{\text{Hydrochloric}}{HCl_{(aq)}}}}\]
APPEARS IN
संबंधित प्रश्न
Give reasons.
Aluminium is a highly reactive metal, yet it is used to make utensils for cooking.
Why do gold ornaments look new even after several years of use?
Define the terms gangue.
An important ore of zinc metal is:
(a) calamine
(b) cuprite
(c) pyrolusite
(d) haematite
Which of the following is an ore of mercury metal?
(a) rock salt
(b) cinnabar
(c) calamine
(d) haematite
The metal which can be extracted from pyrolusite ore is:
(a) mercury
(b) manganese
(c) aluminium
(d) magnesium
Give reasons, why aluminum is used in:
painting electric and telegraphic poles
Aluminum is used in thermite welding:
what is thermit?
Define the following term.
Gangue
Name the following:
The substance added to get rid of gangue in the extraction of metal.
What is meant by concentration of ores?
How many valence electrons are present in metals ?
Arrange the metals of copper, iron, magnesium, sodium and zinc in the decreasing order of reactivity.
In Electrolytic reduction of alumina, Anode : _______ : : Cathode : Graphite lining
Mercury, silver, gold are highly reactive metals.
In the electrolytic method, a layer of highly active metal is applied to a less active metal.
Gold and silver are active metals.
Write the molecular formulae of the following compound.
Cryolite
Explain concept with example/explain with the help of a balanced equation.
Calcination
Iqbal treated a lustrous, divalent element M with sodium hydroxide. He observed the formation of bubbles in reaction mixture. He made the same observations when this element was treated with hydrochloric acid. Suggest how can he identify the produced gas. Write chemical equations for both the reactions.
