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प्रश्न
_______ is the least reactive metal.
पर्याय
silver
sodium
zinc
gold
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उत्तर
Gold is the least reactive metal.
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संबंधित प्रश्न
Define the Ore.
M is a metal above hydrogen in the activity series and its oxide has the formula M2O. This oxide when dissolved in water forms the corresponding hydroxide which is a good conductor of electricity. In the above context, answer the following:
1) What kind of combination exists between M and O?
2)How many electrons are there in the outermost shell of M?
3) Name the group to which M belongs.
4) State the reaction taking place at the cathode.
5) Name the product at the anode.
Write the steps involved in the extraction of pure metals in the middle of the activity series from their carbonate ores.
Name two metals which are highly resistant to corrosion.
Name two metals which are found in nature mainly in the free state (as metallic elements).
Name one ore of aluminium. Name the aluminium compound present in this ore and write its chemical formula.
The two metals which are extracted by means of electrolytic reduction of their molten salts are:
(a) magnesium and manganese
(b) iron and aluminium
(c) zinc and magnesium
(d) magnesium and aluminium
During galvanisation, iron metal is given a thin coating of one of the following metals. This metal is:
(a) chromium
(b) tin
(c) zinc
(d) copper
Give reasons, why aluminum is used in:
making alloys
Name the following:
Name two metals always find in combined state.
Explain the following:
Galvanization protects iron from rusting.
What is passive iron?
Write the molecular formulae of the following compound.
Cryolite
Write the molecular formulae of the following compound.
Fluorspar
Explain the concept of Roasting.
Explain the following reaction with the balanced equation.
Chlorine dissolved in water
Explain the following reaction with the balanced equation.
Zinc carbonate is heated strongly in limited supply of air
Oxides of moderately reactive metals like Zinc, Iron, Nickel, Tin, Copper, etc. are reduced by using:
Why should the metal sulphides and carbonates be converted to metal oxides in the process of extraction of metal from them?
