Question

Choose the correct answer from the option given below:

(i)Which of the following metallic oxides cannot be reduced by normal reducing
1. Iron odixe
2. Copper oxide
3. zinc oxide
4.Magnesium oxide
(ii)5.6 liters of oxygen at STP is equivalent to
1. 1 mole
2.0.5 mole
3. 0.25 mole
4. 0.125 mole
(iii)When a metal atom becomes an ion, it
1.Loses electrons and oxidized 2. Gains electron and reduced
2. Grains electrons and oxidized 3. Loses electrons and reduced
(iv)In the electrolysis of CU SO4 solution by using plantinum electrodes,gas produced at anode is
1.oxygen
2.hydrogen
3.sulphur dioxide
4.hydrogen sulphide​

Answer 1

Answer:

1. all the compounds have different method of reduction so you can't compare them.
2. number of moles at STP is equal to V/22.4 which is equal to 0.25 moles.
3. release of electron is oxidation so the atom of metal becomes positively charged and oxidized
4. the gas produced at anode is Oxygen

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