CBSE Class XI Chemistry Sample Paper

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Questions and Answers

In which range are the critical temperatures of carbon dioxide and methane?

  • 31.1°C to 81.9°C
  • 31.1°C to -81.9°C (correct)
  • -31.1°C to -81.9°C
  • -31.1°C to 81.9°C

What is the maximum marks for CBSE Class – XI CHEMISTRY exam?

  • 90
  • 80
  • 70 (correct)
  • 60

Why is lithium (Li) expected to have a larger number of atoms than sodium (Na) when both are taken in 1.0g each?

  • Lithium has a higher atomic number than sodium.
  • Lithium atoms are smaller in size than sodium atoms. (correct)
  • Lithium has more isotopes than sodium.
  • Lithium has a smaller atomic mass than sodium.

Why is a metal higher than another metal in the electrochemical series considered a weaker reducing agent?

<p>The metal has a higher reduction potential. (C)</p> Signup and view all the answers

What is the main reason for the stronger intermolecular forces in carbon dioxide compared to methane?

<p>Carbon dioxide is polar, while methane is nonpolar. (A)</p> Signup and view all the answers

Flashcards

CO2 & Methane Critical Temperatures

The range of critical temperatures for carbon dioxide and methane is 31.1°C to -81.9°C.

CBSE Class XI Chemistry Exam Marks

The maximum marks for the CBSE Class XI Chemistry exam are 70.

Atoms in 1.0g Li vs Na

Lithium (Li) has more atoms than sodium (Na) in 1.0g because lithium atoms are smaller.

Electrochemical Series Position & Reducing Agent Strength

A metal higher in the electrochemical series is a weaker reducing agent because it has a higher reduction potential.

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Intermolecular Forces: CO2 vs. Methane

Carbon dioxide has stronger intermolecular forces than methane because carbon dioxide is polar, while methane is nonpolar.

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