Q. Which of the following gases is primarily responsible for the greenhouse effect?
A.
Ozone
B.
Carbon Dioxide
C.
Nitrogen
D.
Methane
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Solution
Carbon Dioxide is a major greenhouse gas that traps heat in the atmosphere, contributing to global warming.
Correct Answer: B — Carbon Dioxide
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Q. Which of the following gases is produced when aluminum reacts with hydrochloric acid?
A.
Hydrogen
B.
Oxygen
C.
Chlorine
D.
Nitrogen
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Solution
Hydrogen gas is produced when aluminum reacts with hydrochloric acid.
Correct Answer: A — Hydrogen
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Q. Which of the following gases will diffuse the fastest under identical conditions?
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Solution
According to Graham's law of effusion, lighter gases diffuse faster; hence, He will diffuse the fastest.
Correct Answer: A — He
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Q. Which of the following gases will have the highest average speed at the same temperature?
A.
Oxygen (O2)
B.
Nitrogen (N2)
C.
Hydrogen (H2)
D.
Carbon Dioxide (CO2)
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Solution
Hydrogen (H2) has the lowest molar mass, thus it will have the highest average speed according to the kinetic theory.
Correct Answer: C — Hydrogen (H2)
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Q. Which of the following gases will have the highest rate of diffusion at a given temperature?
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Solution
According to Graham's law of effusion, lighter gases diffuse faster; H2 has the lowest molar mass and will diffuse the fastest.
Correct Answer: D — H2
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Q. Which of the following gases will have the highest rate of diffusion at the same temperature?
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Solution
According to Graham's law, lighter gases diffuse faster. H2 has the lowest molar mass.
Correct Answer: D — H2
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Q. Which of the following gases will have the highest RMS speed at the same temperature?
A.
Oxygen (M = 32 g/mol)
B.
Nitrogen (M = 28 g/mol)
C.
Hydrogen (M = 2 g/mol)
D.
Carbon Dioxide (M = 44 g/mol)
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Solution
RMS speed is inversely proportional to the square root of molar mass. Hydrogen has the lowest molar mass, hence it will have the highest RMS speed.
Correct Answer: C — Hydrogen (M = 2 g/mol)
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Q. Which of the following gases will have the highest root mean square speed at the same temperature?
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Solution
The root mean square speed is inversely proportional to the square root of the molar mass. H2 has the lowest molar mass, hence it has the highest root mean square speed.
Correct Answer: C — H2
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Q. Which of the following gases would have the highest average speed at a given temperature?
A.
Oxygen (O2)
B.
Nitrogen (N2)
C.
Hydrogen (H2)
D.
Carbon Dioxide (CO2)
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Solution
At a given temperature, lighter gases like hydrogen (H2) have higher average speeds compared to heavier gases like oxygen (O2) or carbon dioxide (CO2).
Correct Answer: C — Hydrogen (H2)
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Q. Which of the following gases would have the highest rate of diffusion at a given temperature?
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Solution
Hydrogen (H2) has the lowest molar mass and thus the highest rate of diffusion according to Graham's law.
Correct Answer: D — H2
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Q. Which of the following gases would have the highest root mean square speed at the same temperature?
A.
Oxygen (O2)
B.
Nitrogen (N2)
C.
Hydrogen (H2)
D.
Carbon Dioxide (CO2)
Show solution
Solution
Hydrogen (H2) has the lowest molar mass among the given gases, thus it will have the highest root mean square speed at the same temperature, as v_rms is inversely proportional to the square root of molar mass.
Correct Answer: C — Hydrogen (H2)
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Q. Which of the following gates is a universal gate?
A.
AND
B.
OR
C.
NAND
D.
XOR
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Solution
The NAND gate is a universal gate because it can be used to create any other gate.
Correct Answer: C — NAND
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Q. Which of the following gates is considered a universal gate?
A.
AND Gate
B.
OR Gate
C.
NAND Gate
D.
XOR Gate
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Solution
The NAND gate is considered a universal gate because it can be used to create any other gate.
Correct Answer: C — NAND Gate
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Q. Which of the following gates is equivalent to an AND gate followed by a NOT gate?
A.
OR
B.
NAND
C.
NOR
D.
XOR
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Solution
The output of an AND gate followed by a NOT gate is a NAND gate.
Correct Answer: B — NAND
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Q. Which of the following groups exhibits a -I effect?
A.
-OH
B.
-NO2
C.
-CH3
D.
-Cl
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Solution
The -NO2 group is a strong electron-withdrawing group that exhibits a -I effect.
Correct Answer: B — -NO2
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Q. Which of the following groups exhibits a strong +M effect?
A.
-NO2
B.
-OH
C.
-CN
D.
-COOH
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Solution
The -OH group exhibits a strong +M effect due to its ability to donate electron density through resonance.
Correct Answer: B — -OH
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Q. Which of the following groups exhibits a strong -I effect?
A.
–NO2
B.
–CH3
C.
–OH
D.
–NH2
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Solution
The –NO2 group is a strong electron-withdrawing group and exhibits a strong -I effect.
Correct Answer: A — –NO2
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Q. Which of the following groups has a -I effect?
A.
-NH2
B.
-F
C.
-OCH3
D.
-C2H5
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Solution
-F exhibits a -I effect as it withdraws electron density from the rest of the molecule.
Correct Answer: B — -F
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Q. Which of the following groups has both +M and -I effects?
A.
-NH2
B.
-NO2
C.
-COOH
D.
-F
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Solution
The -NH2 group has a +M effect due to resonance donation and a -I effect due to its electronegativity.
Correct Answer: A — -NH2
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Q. Which of the following groups has the strongest -I effect?
A.
-F
B.
-Cl
C.
-Br
D.
-I
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Solution
-F has the strongest -I effect due to its high electronegativity.
Correct Answer: A — -F
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Q. Which of the following groups is a strong +M (mesomeric) director?
A.
–NO2
B.
–OH
C.
–COOH
D.
–CN
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Solution
The –OH group is a strong +M director as it donates electron density through resonance.
Correct Answer: B — –OH
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Q. Which of the following groups is a strong -I group?
A.
-F
B.
-CH3
C.
-OCH3
D.
-Br
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Solution
The -F group is a strong -I group due to its high electronegativity.
Correct Answer: A — -F
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Q. Which of the following groups is a strong -M group?
A.
-OH
B.
-OCH3
C.
-NO2
D.
-NH2
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Solution
-NO2 is a strong -M group as it withdraws electron density through resonance.
Correct Answer: C — -NO2
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Q. Which of the following groups is a strong electron-donating group?
A.
–NO2
B.
–OH
C.
–CN
D.
–COOH
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Solution
The –OH group is a strong electron-donating group through resonance (+M effect).
Correct Answer: B — –OH
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Q. Which of the following groups is a weak +M director?
A.
-OH
B.
-OCH3
C.
-NH2
D.
-CH3
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Solution
-CH3 is a weak +M director as it can donate some electron density but is less effective than -OH or -OCH3.
Correct Answer: D — -CH3
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Q. Which of the following groups is a weak -I effect group?
A.
–F
B.
–Cl
C.
–Br
D.
–I
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Solution
The –I effect decreases in strength down the group in the halogens, making –I the weakest -I group.
Correct Answer: D — –I
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Q. Which of the following groups is a weak -I effect?
A.
-CH3
B.
-Cl
C.
-Br
D.
-I
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Solution
The -CH3 group exhibits a weak -I effect as it is a weak electron-donating group.
Correct Answer: A — -CH3
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Q. Which of the following groups is a weak -M group?
A.
-CHO
B.
-COOH
C.
-NO2
D.
-F
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Solution
-F is a weak -M group as it has a slight electron-withdrawing effect but is not as strong as -CHO or -COOH.
Correct Answer: D — -F
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Q. Which of the following groups is considered a weak -I group?
A.
-NO2
B.
-CN
C.
-F
D.
-COOH
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Solution
-F is considered a weak -I group compared to -NO2 and -CN.
Correct Answer: C — -F
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Q. Which of the following groups is known for its +I effect?
A.
-CH3
B.
-OH
C.
-NO2
D.
-COOH
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Solution
-CH3 exhibits a +I effect as it donates electron density through inductive effect.
Correct Answer: A — -CH3
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