Mole Concept and Molar Mass
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CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

306780 A gas is found to have a formula \((\mathrm{CO})_{\mathrm{x}}\). If its vapour density is 70 , the value of x is

1 2.5
2 3.0
3 5.0
4 6.0
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

306781 The most abundant elements by mass in the body of a healthy human adult are:
Oxygen (61.4%), Carbon (22.9%), Hydrogen (10.0%); and Nitrogen (2.6%). The weight which a 75 kg person would gain if all \(^{\rm{1}}{\rm{H}}\) atoms are replaced by \(^{\rm{2}}{\rm{H}}\) atoms is

1 15 kg
2 37.5 kg
3 7.5 kg
4 10 kg
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

306782 How many moles of urea are present in \(\mathrm{5.4 \mathrm{~g}}\) ?
\(\left( {{\text{Molar}}\,{\text{mass = 60 g mo}}{{\text{l}}^{{\text{ - 1}}}}} \right)\)

1 2.9
2 0.09
3 1.2
4 2.4
MHTCET - 2021
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

306783 Assertion :
One mole of \(\mathrm{HCl}\) contains \(6.023 \times 10^{23}\) molecules of \(\mathrm{HCl}\).
Reason :
\(36.5 \mathrm{~g}\) of \(\mathrm{HCl}\) also contains \(6.023 \times 10^{23}\) molecules of \(\mathrm{HCl}\)

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

306784 Number of molecules in 100 mL of each of \({{\rm{O}}_{\rm{2}}}{\rm{,N}}{{\rm{H}}_{\rm{3}}}{\mkern 1mu} {\mkern 1mu} {\rm{and}}{\mkern 1mu} {\mkern 1mu} {\rm{C}}{{\rm{O}}_{\rm{2}}}\) at STP are

1 In the order \({\rm{C}}{{\rm{O}}_{\rm{2}}}{\rm{ < }}{{\rm{O}}_{\rm{2}}}{\rm{ < N}}{{\rm{H}}_{\rm{3}}}\)
2 In the order \({\rm{N}}{{\rm{H}}_{\rm{3}}}{\rm{ < }}{{\rm{O}}_{\rm{2}}}{\rm{ < C}}{{\rm{O}}_{\rm{2}}}\)
3 The same
4 \({\rm{N}}{{\rm{H}}_{\rm{3}}}{\rm{ = C}}{{\rm{O}}_{\rm{2}}}{\rm{ < }}{{\rm{O}}_{\rm{2}}}\)
NEET DIGITAL LIBRARY
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

306780 A gas is found to have a formula \((\mathrm{CO})_{\mathrm{x}}\). If its vapour density is 70 , the value of x is

1 2.5
2 3.0
3 5.0
4 6.0
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

306781 The most abundant elements by mass in the body of a healthy human adult are:
Oxygen (61.4%), Carbon (22.9%), Hydrogen (10.0%); and Nitrogen (2.6%). The weight which a 75 kg person would gain if all \(^{\rm{1}}{\rm{H}}\) atoms are replaced by \(^{\rm{2}}{\rm{H}}\) atoms is

1 15 kg
2 37.5 kg
3 7.5 kg
4 10 kg
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

306782 How many moles of urea are present in \(\mathrm{5.4 \mathrm{~g}}\) ?
\(\left( {{\text{Molar}}\,{\text{mass = 60 g mo}}{{\text{l}}^{{\text{ - 1}}}}} \right)\)

1 2.9
2 0.09
3 1.2
4 2.4
MHTCET - 2021
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

306783 Assertion :
One mole of \(\mathrm{HCl}\) contains \(6.023 \times 10^{23}\) molecules of \(\mathrm{HCl}\).
Reason :
\(36.5 \mathrm{~g}\) of \(\mathrm{HCl}\) also contains \(6.023 \times 10^{23}\) molecules of \(\mathrm{HCl}\)

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

306784 Number of molecules in 100 mL of each of \({{\rm{O}}_{\rm{2}}}{\rm{,N}}{{\rm{H}}_{\rm{3}}}{\mkern 1mu} {\mkern 1mu} {\rm{and}}{\mkern 1mu} {\mkern 1mu} {\rm{C}}{{\rm{O}}_{\rm{2}}}\) at STP are

1 In the order \({\rm{C}}{{\rm{O}}_{\rm{2}}}{\rm{ < }}{{\rm{O}}_{\rm{2}}}{\rm{ < N}}{{\rm{H}}_{\rm{3}}}\)
2 In the order \({\rm{N}}{{\rm{H}}_{\rm{3}}}{\rm{ < }}{{\rm{O}}_{\rm{2}}}{\rm{ < C}}{{\rm{O}}_{\rm{2}}}\)
3 The same
4 \({\rm{N}}{{\rm{H}}_{\rm{3}}}{\rm{ = C}}{{\rm{O}}_{\rm{2}}}{\rm{ < }}{{\rm{O}}_{\rm{2}}}\)
Join With Us for More Updates
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

306780 A gas is found to have a formula \((\mathrm{CO})_{\mathrm{x}}\). If its vapour density is 70 , the value of x is

1 2.5
2 3.0
3 5.0
4 6.0
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

306781 The most abundant elements by mass in the body of a healthy human adult are:
Oxygen (61.4%), Carbon (22.9%), Hydrogen (10.0%); and Nitrogen (2.6%). The weight which a 75 kg person would gain if all \(^{\rm{1}}{\rm{H}}\) atoms are replaced by \(^{\rm{2}}{\rm{H}}\) atoms is

1 15 kg
2 37.5 kg
3 7.5 kg
4 10 kg
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

306782 How many moles of urea are present in \(\mathrm{5.4 \mathrm{~g}}\) ?
\(\left( {{\text{Molar}}\,{\text{mass = 60 g mo}}{{\text{l}}^{{\text{ - 1}}}}} \right)\)

1 2.9
2 0.09
3 1.2
4 2.4
MHTCET - 2021
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

306783 Assertion :
One mole of \(\mathrm{HCl}\) contains \(6.023 \times 10^{23}\) molecules of \(\mathrm{HCl}\).
Reason :
\(36.5 \mathrm{~g}\) of \(\mathrm{HCl}\) also contains \(6.023 \times 10^{23}\) molecules of \(\mathrm{HCl}\)

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

306784 Number of molecules in 100 mL of each of \({{\rm{O}}_{\rm{2}}}{\rm{,N}}{{\rm{H}}_{\rm{3}}}{\mkern 1mu} {\mkern 1mu} {\rm{and}}{\mkern 1mu} {\mkern 1mu} {\rm{C}}{{\rm{O}}_{\rm{2}}}\) at STP are

1 In the order \({\rm{C}}{{\rm{O}}_{\rm{2}}}{\rm{ < }}{{\rm{O}}_{\rm{2}}}{\rm{ < N}}{{\rm{H}}_{\rm{3}}}\)
2 In the order \({\rm{N}}{{\rm{H}}_{\rm{3}}}{\rm{ < }}{{\rm{O}}_{\rm{2}}}{\rm{ < C}}{{\rm{O}}_{\rm{2}}}\)
3 The same
4 \({\rm{N}}{{\rm{H}}_{\rm{3}}}{\rm{ = C}}{{\rm{O}}_{\rm{2}}}{\rm{ < }}{{\rm{O}}_{\rm{2}}}\)
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CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

306780 A gas is found to have a formula \((\mathrm{CO})_{\mathrm{x}}\). If its vapour density is 70 , the value of x is

1 2.5
2 3.0
3 5.0
4 6.0
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

306781 The most abundant elements by mass in the body of a healthy human adult are:
Oxygen (61.4%), Carbon (22.9%), Hydrogen (10.0%); and Nitrogen (2.6%). The weight which a 75 kg person would gain if all \(^{\rm{1}}{\rm{H}}\) atoms are replaced by \(^{\rm{2}}{\rm{H}}\) atoms is

1 15 kg
2 37.5 kg
3 7.5 kg
4 10 kg
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

306782 How many moles of urea are present in \(\mathrm{5.4 \mathrm{~g}}\) ?
\(\left( {{\text{Molar}}\,{\text{mass = 60 g mo}}{{\text{l}}^{{\text{ - 1}}}}} \right)\)

1 2.9
2 0.09
3 1.2
4 2.4
MHTCET - 2021
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

306783 Assertion :
One mole of \(\mathrm{HCl}\) contains \(6.023 \times 10^{23}\) molecules of \(\mathrm{HCl}\).
Reason :
\(36.5 \mathrm{~g}\) of \(\mathrm{HCl}\) also contains \(6.023 \times 10^{23}\) molecules of \(\mathrm{HCl}\)

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

306784 Number of molecules in 100 mL of each of \({{\rm{O}}_{\rm{2}}}{\rm{,N}}{{\rm{H}}_{\rm{3}}}{\mkern 1mu} {\mkern 1mu} {\rm{and}}{\mkern 1mu} {\mkern 1mu} {\rm{C}}{{\rm{O}}_{\rm{2}}}\) at STP are

1 In the order \({\rm{C}}{{\rm{O}}_{\rm{2}}}{\rm{ < }}{{\rm{O}}_{\rm{2}}}{\rm{ < N}}{{\rm{H}}_{\rm{3}}}\)
2 In the order \({\rm{N}}{{\rm{H}}_{\rm{3}}}{\rm{ < }}{{\rm{O}}_{\rm{2}}}{\rm{ < C}}{{\rm{O}}_{\rm{2}}}\)
3 The same
4 \({\rm{N}}{{\rm{H}}_{\rm{3}}}{\rm{ = C}}{{\rm{O}}_{\rm{2}}}{\rm{ < }}{{\rm{O}}_{\rm{2}}}\)
NEET DIGITAL LIBRARY
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

306780 A gas is found to have a formula \((\mathrm{CO})_{\mathrm{x}}\). If its vapour density is 70 , the value of x is

1 2.5
2 3.0
3 5.0
4 6.0
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

306781 The most abundant elements by mass in the body of a healthy human adult are:
Oxygen (61.4%), Carbon (22.9%), Hydrogen (10.0%); and Nitrogen (2.6%). The weight which a 75 kg person would gain if all \(^{\rm{1}}{\rm{H}}\) atoms are replaced by \(^{\rm{2}}{\rm{H}}\) atoms is

1 15 kg
2 37.5 kg
3 7.5 kg
4 10 kg
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

306782 How many moles of urea are present in \(\mathrm{5.4 \mathrm{~g}}\) ?
\(\left( {{\text{Molar}}\,{\text{mass = 60 g mo}}{{\text{l}}^{{\text{ - 1}}}}} \right)\)

1 2.9
2 0.09
3 1.2
4 2.4
MHTCET - 2021
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

306783 Assertion :
One mole of \(\mathrm{HCl}\) contains \(6.023 \times 10^{23}\) molecules of \(\mathrm{HCl}\).
Reason :
\(36.5 \mathrm{~g}\) of \(\mathrm{HCl}\) also contains \(6.023 \times 10^{23}\) molecules of \(\mathrm{HCl}\)

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

306784 Number of molecules in 100 mL of each of \({{\rm{O}}_{\rm{2}}}{\rm{,N}}{{\rm{H}}_{\rm{3}}}{\mkern 1mu} {\mkern 1mu} {\rm{and}}{\mkern 1mu} {\mkern 1mu} {\rm{C}}{{\rm{O}}_{\rm{2}}}\) at STP are

1 In the order \({\rm{C}}{{\rm{O}}_{\rm{2}}}{\rm{ < }}{{\rm{O}}_{\rm{2}}}{\rm{ < N}}{{\rm{H}}_{\rm{3}}}\)
2 In the order \({\rm{N}}{{\rm{H}}_{\rm{3}}}{\rm{ < }}{{\rm{O}}_{\rm{2}}}{\rm{ < C}}{{\rm{O}}_{\rm{2}}}\)
3 The same
4 \({\rm{N}}{{\rm{H}}_{\rm{3}}}{\rm{ = C}}{{\rm{O}}_{\rm{2}}}{\rm{ < }}{{\rm{O}}_{\rm{2}}}\)