Mole Concept and Molar Mass
« Previous Topic: Laws of Chemical Combinations Next Topic: Nature of Matter »
NEET DIGITAL LIBRARY
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

306709 The density of liquid (mol. wt. = 70) is \({\rm{1}}{\rm{.2g}}{\mkern 1mu} {\mkern 1mu} {\rm{m}}{{\rm{L}}^{{\rm{ - 1}}}}\). If 2 mL of liquid contains 35 drops, the number of molecules of liquid in one drop are:

1 \(\frac{{{\rm{1}}{\rm{.2}}}}{{{\rm{3}}{\rm{.5}}}}{\rm{ \times }}{{\rm{N}}_{\rm{A}}}\)
2 \(\frac{{\rm{1}}}{{{\rm{35}}}}{\rm{ \times }}{{\rm{N}}_{\rm{A}}}\)
3 \(\frac{{{\rm{1}}{\rm{.2}}}}{{{\rm{3}}{{\rm{5}}^{\rm{2}}}}}{\rm{ \times }}{{\rm{N}}_{\rm{A}}}\)
4 \({\rm{1}}{\rm{.2}}\,\,{{\rm{N}}_{\rm{A}}}\)
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

306710 Volume of a gas at NTP is \(1.12 \times 10^{-7} \mathrm{~cm}^{3}\). The number of molecules in it is

1 \(3.01 \times 10^{12}\)
2 \(3.01 \times 10^{24}\)
3 \(3.01 \times 10^{23}\)
4 \(3.01 \times 10^{20}\)
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

306711 If \(\mathrm{\mathrm{H}_{2} \mathrm{SO}_{4}}\) ionises as
\(\mathrm{\mathrm{H}_{2} \mathrm{SO}_{4}+2 \mathrm{H}_{2} \mathrm{O} \rightarrow 2 \mathrm{H}_{3} \mathrm{O}^{+}+\mathrm{SO}_{4}^{2-}}\). Then total number of ions produced by 0.1 mole \(\mathrm{\mathrm{H}_{2} \mathrm{SO}_{4}}\) will be

1 \(\mathrm{9.03 \times 10^{21}}\)
2 \(\mathrm{3.01 \times 10^{22}}\)
3 \(\mathrm{6.02 \times 10^{22}}\)
4 \(\mathrm{1.8 \times 10^{23}}\)
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

306712 If \({N_A}\) is Avogadro’s number then number of valence electrons in 4.2 g of nitride ion \(\left( {{N^{3 - }}} \right)\) is

1 \(2.4{N_A}\)
2 \(4.2{N_A}\)
3 \(1.6{N_A}\)
4 \(3.2{N_A}\)
Join With Us for More Updates
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

306709 The density of liquid (mol. wt. = 70) is \({\rm{1}}{\rm{.2g}}{\mkern 1mu} {\mkern 1mu} {\rm{m}}{{\rm{L}}^{{\rm{ - 1}}}}\). If 2 mL of liquid contains 35 drops, the number of molecules of liquid in one drop are:

1 \(\frac{{{\rm{1}}{\rm{.2}}}}{{{\rm{3}}{\rm{.5}}}}{\rm{ \times }}{{\rm{N}}_{\rm{A}}}\)
2 \(\frac{{\rm{1}}}{{{\rm{35}}}}{\rm{ \times }}{{\rm{N}}_{\rm{A}}}\)
3 \(\frac{{{\rm{1}}{\rm{.2}}}}{{{\rm{3}}{{\rm{5}}^{\rm{2}}}}}{\rm{ \times }}{{\rm{N}}_{\rm{A}}}\)
4 \({\rm{1}}{\rm{.2}}\,\,{{\rm{N}}_{\rm{A}}}\)
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

306710 Volume of a gas at NTP is \(1.12 \times 10^{-7} \mathrm{~cm}^{3}\). The number of molecules in it is

1 \(3.01 \times 10^{12}\)
2 \(3.01 \times 10^{24}\)
3 \(3.01 \times 10^{23}\)
4 \(3.01 \times 10^{20}\)
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

306711 If \(\mathrm{\mathrm{H}_{2} \mathrm{SO}_{4}}\) ionises as
\(\mathrm{\mathrm{H}_{2} \mathrm{SO}_{4}+2 \mathrm{H}_{2} \mathrm{O} \rightarrow 2 \mathrm{H}_{3} \mathrm{O}^{+}+\mathrm{SO}_{4}^{2-}}\). Then total number of ions produced by 0.1 mole \(\mathrm{\mathrm{H}_{2} \mathrm{SO}_{4}}\) will be

1 \(\mathrm{9.03 \times 10^{21}}\)
2 \(\mathrm{3.01 \times 10^{22}}\)
3 \(\mathrm{6.02 \times 10^{22}}\)
4 \(\mathrm{1.8 \times 10^{23}}\)
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

306712 If \({N_A}\) is Avogadro’s number then number of valence electrons in 4.2 g of nitride ion \(\left( {{N^{3 - }}} \right)\) is

1 \(2.4{N_A}\)
2 \(4.2{N_A}\)
3 \(1.6{N_A}\)
4 \(3.2{N_A}\)
For More Updates join with Us
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

306709 The density of liquid (mol. wt. = 70) is \({\rm{1}}{\rm{.2g}}{\mkern 1mu} {\mkern 1mu} {\rm{m}}{{\rm{L}}^{{\rm{ - 1}}}}\). If 2 mL of liquid contains 35 drops, the number of molecules of liquid in one drop are:

1 \(\frac{{{\rm{1}}{\rm{.2}}}}{{{\rm{3}}{\rm{.5}}}}{\rm{ \times }}{{\rm{N}}_{\rm{A}}}\)
2 \(\frac{{\rm{1}}}{{{\rm{35}}}}{\rm{ \times }}{{\rm{N}}_{\rm{A}}}\)
3 \(\frac{{{\rm{1}}{\rm{.2}}}}{{{\rm{3}}{{\rm{5}}^{\rm{2}}}}}{\rm{ \times }}{{\rm{N}}_{\rm{A}}}\)
4 \({\rm{1}}{\rm{.2}}\,\,{{\rm{N}}_{\rm{A}}}\)
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

306710 Volume of a gas at NTP is \(1.12 \times 10^{-7} \mathrm{~cm}^{3}\). The number of molecules in it is

1 \(3.01 \times 10^{12}\)
2 \(3.01 \times 10^{24}\)
3 \(3.01 \times 10^{23}\)
4 \(3.01 \times 10^{20}\)
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

306711 If \(\mathrm{\mathrm{H}_{2} \mathrm{SO}_{4}}\) ionises as
\(\mathrm{\mathrm{H}_{2} \mathrm{SO}_{4}+2 \mathrm{H}_{2} \mathrm{O} \rightarrow 2 \mathrm{H}_{3} \mathrm{O}^{+}+\mathrm{SO}_{4}^{2-}}\). Then total number of ions produced by 0.1 mole \(\mathrm{\mathrm{H}_{2} \mathrm{SO}_{4}}\) will be

1 \(\mathrm{9.03 \times 10^{21}}\)
2 \(\mathrm{3.01 \times 10^{22}}\)
3 \(\mathrm{6.02 \times 10^{22}}\)
4 \(\mathrm{1.8 \times 10^{23}}\)
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

306712 If \({N_A}\) is Avogadro’s number then number of valence electrons in 4.2 g of nitride ion \(\left( {{N^{3 - }}} \right)\) is

1 \(2.4{N_A}\)
2 \(4.2{N_A}\)
3 \(1.6{N_A}\)
4 \(3.2{N_A}\)
NEET DIGITAL LIBRARY
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

306709 The density of liquid (mol. wt. = 70) is \({\rm{1}}{\rm{.2g}}{\mkern 1mu} {\mkern 1mu} {\rm{m}}{{\rm{L}}^{{\rm{ - 1}}}}\). If 2 mL of liquid contains 35 drops, the number of molecules of liquid in one drop are:

1 \(\frac{{{\rm{1}}{\rm{.2}}}}{{{\rm{3}}{\rm{.5}}}}{\rm{ \times }}{{\rm{N}}_{\rm{A}}}\)
2 \(\frac{{\rm{1}}}{{{\rm{35}}}}{\rm{ \times }}{{\rm{N}}_{\rm{A}}}\)
3 \(\frac{{{\rm{1}}{\rm{.2}}}}{{{\rm{3}}{{\rm{5}}^{\rm{2}}}}}{\rm{ \times }}{{\rm{N}}_{\rm{A}}}\)
4 \({\rm{1}}{\rm{.2}}\,\,{{\rm{N}}_{\rm{A}}}\)
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

306710 Volume of a gas at NTP is \(1.12 \times 10^{-7} \mathrm{~cm}^{3}\). The number of molecules in it is

1 \(3.01 \times 10^{12}\)
2 \(3.01 \times 10^{24}\)
3 \(3.01 \times 10^{23}\)
4 \(3.01 \times 10^{20}\)
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

306711 If \(\mathrm{\mathrm{H}_{2} \mathrm{SO}_{4}}\) ionises as
\(\mathrm{\mathrm{H}_{2} \mathrm{SO}_{4}+2 \mathrm{H}_{2} \mathrm{O} \rightarrow 2 \mathrm{H}_{3} \mathrm{O}^{+}+\mathrm{SO}_{4}^{2-}}\). Then total number of ions produced by 0.1 mole \(\mathrm{\mathrm{H}_{2} \mathrm{SO}_{4}}\) will be

1 \(\mathrm{9.03 \times 10^{21}}\)
2 \(\mathrm{3.01 \times 10^{22}}\)
3 \(\mathrm{6.02 \times 10^{22}}\)
4 \(\mathrm{1.8 \times 10^{23}}\)
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

306712 If \({N_A}\) is Avogadro’s number then number of valence electrons in 4.2 g of nitride ion \(\left( {{N^{3 - }}} \right)\) is

1 \(2.4{N_A}\)
2 \(4.2{N_A}\)
3 \(1.6{N_A}\)
4 \(3.2{N_A}\)
Join With Us for More Updates