Short Answer Type
Multiple Choice Questions20 mL solution of 0.1 M ferrous sulphate was completely oxidised using a suitable oxidising agent. What is the number of electrons exchanged?
1.204 x 1022
193
1930
1.204 x 1021
Short Answer Type
Long Answer TypeWhat is the utility of mole concept?
4. To calculate the number of molecules and the number of moles in a given mass of the substance.
No. of molecules in a given mass of a substance
5. To calculate the volume occupied at S.T.P. by a given mass of a gas.
Volume occupied at S.T.P. by given mass of a gas
6. To calculate the number of molecules present in a given volume of a gas at S.T.P.
No. of molecules contained in given volume of gas at S.T.P.
7. To calculate the number of atoms and molecules in the given number of moles of a substance.
No. of atoms in a given number of moles of element
= 6 · 023 × 1023 × No. of moles of element No. of molecules in a given number of moles of substance
= 6·023 × 1023 × No. of moles of substance
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