Which of the following gases deviates most from ideal behavior at room temperature? MCQ with Answer and Explanation

Which of the following gases deviates most from ideal behavior at room temperature?
A. Hydrogen
B. Nitrogen
C. Helium
D. Ammonia
Answer: Option D
Solution (By JKSSB Mock Tests)
Real gases deviate from ideal behavior due to intermolecular forces and molecular volume. Ammonia (NH3) has strong intermolecular hydrogen bonding and a relatively large molecular size compared to small, non-polar gases like He, H2, and N2. Therefore, ammonia exhibits the greatest deviation from ideal gas behavior.

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Practice More chemistry Questions

Question #1
Which of the following is a chemical property of acids?
A. React with metals to produce hydrogen gas
B. Turn blue litmus red
C. Sour taste
D. Conduct electricity in solution

Correct Answer: Option A


Explanation:
Reacting with metals (e.g., Zn + 2HCl → ZnCl₂ + H₂) to produce hydrogen gas is a chemical property because new substances are formed. Sour taste is physical sensation, color change of litmus is an indicator of chemical reaction but is not itself a chemical property; reactivity is. Conductivity is physical. Chemical properties describe a substance's ability to undergo chemical change.

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Question #2
Which element is in Group 2, Period 4 of the periodic table?
A. Mg
B. Be
C. Sr
D. Ca

Correct Answer: Option D


Explanation:
Calcium (Ca, Z=20) has configuration 2,8,8,2. 4 shells → Period 4; 2 valence electrons → Group 2. Mg is Group 2, Period 3. Sr is Group 2, Period 5. Be is Group 2, Period 2.

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Question #3
Which gas is evolved when zinc granules react with dilute sulfuric acid?
A. Oxygen
B. Sulfur dioxide
C. Hydrogen
D. Carbon dioxide

Correct Answer: Option C


Explanation:
Zn + H₂SO₄ → ZnSO₄ + H₂↑. Hydrogen gas is released, which burns with a pop sound. This is a test for hydrogen. Metals above hydrogen in reactivity series displace it from acids. Dilute H₂SO₄ with Zn produces H₂; with Cu, no reaction.

This question belongs to: Science chemistry