Q. What is the effect of increasing the number of carbon atoms in a carboxylic acid on its acidity?
A.
Increases acidity
B.
Decreases acidity
C.
No effect
D.
Depends on the structure
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Solution
As the number of carbon atoms increases, the acidity generally decreases due to the increasing electron-donating effect of alkyl groups.
Correct Answer: B — Decreases acidity
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Q. What is the effect of increasing the number of carbon atoms in a carboxylic acid on its solubility in water?
A.
Increases solubility
B.
Decreases solubility
C.
No effect
D.
First increases then decreases
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Solution
As the number of carbon atoms increases, the solubility of carboxylic acids in water generally decreases due to the increasing hydrophobic character.
Correct Answer: B — Decreases solubility
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Q. What is the effect of increasing the number of carbon atoms in alcohols on their boiling points?
A.
Decreases
B.
Increases
C.
Remains the same
D.
Varies randomly
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Solution
The boiling points of alcohols increase with the number of carbon atoms due to increased van der Waals forces.
Correct Answer: B — Increases
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Q. What is the effect of increasing the number of carbon atoms in aldehydes on their boiling points?
A.
Decreases
B.
Increases
C.
Remains constant
D.
Varies unpredictably
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Solution
The boiling points of aldehydes increase with the number of carbon atoms due to increased van der Waals forces.
Correct Answer: B — Increases
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Q. What is the effect of increasing the pressure on the equilibrium of the reaction: 2N2(g) + 3H2(g) ⇌ 2NH3(g)?
A.
Shifts to the left
B.
Shifts to the right
C.
No effect
D.
Increases the rate of reaction
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Solution
Increasing the pressure will shift the equilibrium to the right, favoring the formation of NH3, as there are fewer moles of gas on the product side.
Correct Answer: B — Shifts to the right
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Q. What is the effect of increasing the pressure on the rate of a reaction involving gaseous reactants?
A.
Rate decreases
B.
Rate increases
C.
No effect
D.
Depends on the reaction
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Solution
Increasing the pressure increases the concentration of gaseous reactants, which generally increases the rate of reaction.
Correct Answer: B — Rate increases
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Q. What is the effect of increasing the size of the halogen atom on the reactivity of haloalkanes?
A.
Increases reactivity
B.
Decreases reactivity
C.
No effect
D.
Depends on the solvent
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Solution
Increasing the size of the halogen atom generally increases the reactivity of haloalkanes due to the weaker C-X bond.
Correct Answer: A — Increases reactivity
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Q. What is the effect of increasing the size of the halogen in haloalkanes on the bond strength?
A.
Increases
B.
Decreases
C.
Remains the same
D.
Varies randomly
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Solution
As the size of the halogen increases, the bond strength decreases due to the longer bond length and weaker overlap.
Correct Answer: B — Decreases
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Q. What is the effect of increasing the steric hindrance on the reactivity of aldehydes and ketones?
A.
Increases reactivity
B.
Decreases reactivity
C.
No effect
D.
Reactivity depends on solvent
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Solution
Increasing steric hindrance decreases the reactivity of ketones compared to aldehydes.
Correct Answer: B — Decreases reactivity
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Q. What is the effect of increasing the temperature on the equilibrium constant of an exothermic reaction?
A.
Increases
B.
Decreases
C.
Remains the same
D.
Depends on the reaction
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Solution
Increasing the temperature of an exothermic reaction decreases the equilibrium constant.
Correct Answer: B — Decreases
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Q. What is the effect of substituents on the reactivity of aromatic compounds in electrophilic substitution?
A.
All substituents deactivate the ring.
B.
Electron-donating groups activate the ring.
C.
Electron-withdrawing groups have no effect.
D.
All substituents direct to the meta position.
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Solution
Electron-donating groups activate the aromatic ring, making it more reactive towards electrophilic substitution.
Correct Answer: B — Electron-donating groups activate the ring.
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Q. What is the effect of substituents on the reactivity of aromatic compounds?
A.
All substituents are deactivating
B.
Some are activating and some are deactivating
C.
All are activating
D.
None affect reactivity
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Solution
Substituents can either activate or deactivate the aromatic ring towards electrophilic substitution, depending on their electron-donating or electron-withdrawing nature.
Correct Answer: B — Some are activating and some are deactivating
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Q. What is the effect of temperature on Raoult's Law?
A.
It has no effect.
B.
It increases vapor pressure.
C.
It decreases vapor pressure.
D.
It only affects the solute.
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Solution
Temperature affects the vapor pressure of both the solvent and the solution, generally increasing vapor pressure with temperature.
Correct Answer: B — It increases vapor pressure.
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Q. What is the effect of temperature on the entropy of a substance?
A.
Entropy decreases with increasing temperature.
B.
Entropy increases with increasing temperature.
C.
Entropy remains constant with temperature.
D.
Temperature has no effect on entropy.
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Solution
As temperature increases, the kinetic energy of particles increases, leading to greater disorder and thus higher entropy.
Correct Answer: B — Entropy increases with increasing temperature.
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Q. What is the effect of temperature on the equilibrium constant for an exothermic reaction?
A.
Increases with temperature
B.
Decreases with temperature
C.
Remains constant
D.
Depends on the concentration
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Solution
For exothermic reactions, increasing the temperature shifts the equilibrium to the left, thus decreasing the equilibrium constant.
Correct Answer: B — Decreases with temperature
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Q. What is the effect of temperature on the equilibrium constant K for an exothermic reaction?
A.
K increases with temperature
B.
K decreases with temperature
C.
K remains constant
D.
K is independent of temperature
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Solution
For an exothermic reaction, increasing the temperature shifts the equilibrium to the left, thus decreasing the value of K.
Correct Answer: B — K decreases with temperature
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Q. What is the effect of temperature on the vapor pressure of a solvent according to Raoult's Law?
A.
Vapor pressure decreases with temperature
B.
Vapor pressure increases with temperature
C.
Vapor pressure remains constant with temperature
D.
Vapor pressure is independent of the solvent
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Solution
According to Raoult's Law, the vapor pressure of a solvent increases with an increase in temperature.
Correct Answer: B — Vapor pressure increases with temperature
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Q. What is the effect of the +M effect on the stability of a carbocation?
A.
Destabilizes the carbocation
B.
Stabilizes the carbocation
C.
No effect on stability
D.
Increases acidity
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Solution
The +M effect stabilizes the carbocation by donating electron density through resonance.
Correct Answer: B — Stabilizes the carbocation
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Q. What is the effect of the -I effect on acidity?
A.
Increases acidity
B.
Decreases acidity
C.
No effect on acidity
D.
Depends on the solvent
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Solution
The -I effect increases acidity by stabilizing the negative charge on the conjugate base.
Correct Answer: A — Increases acidity
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Q. What is the effect of the -I group on acidity?
A.
Increases acidity
B.
Decreases acidity
C.
No effect on acidity
D.
Depends on the solvent
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Solution
Electron-withdrawing groups (-I) increase the acidity of compounds by stabilizing the negative charge on the conjugate base.
Correct Answer: A — Increases acidity
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Q. What is the effect of the -M (mesomeric) effect on the stability of a carbocation?
A.
Destabilizes the carbocation
B.
Stabilizes the carbocation
C.
No effect on stability
D.
Increases acidity
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Solution
The -M effect can stabilize a carbocation by delocalizing the positive charge.
Correct Answer: B — Stabilizes the carbocation
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Q. What is the effect of the -M group on the stability of a carbocation?
A.
Destabilizes the carbocation
B.
Stabilizes the carbocation
C.
No effect on stability
D.
Increases acidity
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Solution
-M groups destabilize carbocations by withdrawing electron density through resonance.
Correct Answer: A — Destabilizes the carbocation
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Q. What is the electron configuration of Chromium (Cr)?
A.
[Ar] 4s2 3d4
B.
[Ar] 4s1 3d5
C.
[Ar] 4s2 3d5
D.
[Ar] 4s2 3d3
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Solution
Chromium has an electron configuration of [Ar] 4s1 3d5 due to stability from half-filled d-orbitals.
Correct Answer: B — [Ar] 4s1 3d5
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Q. What is the electron configuration of Magnesium?
A.
1s² 2s² 2p⁶ 3s²
B.
1s² 2s² 2p⁶ 3s² 3p¹
C.
1s² 2s² 2p⁶ 3s² 3p²
D.
1s² 2s² 2p⁶ 3s² 3d¹
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Solution
The electron configuration of Magnesium (Mg) is 1s² 2s² 2p⁶ 3s².
Correct Answer: A — 1s² 2s² 2p⁶ 3s²
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Q. What is the electron configuration of oxygen (O)?
A.
1s2 2s2 2p4
B.
1s2 2s2 2p6
C.
1s2 2s1 2p5
D.
1s2 2s2 2p3
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Solution
The electron configuration of oxygen (atomic number 8) is 1s2 2s2 2p4.
Correct Answer: A — 1s2 2s2 2p4
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Q. What is the electron configuration of potassium (K)?
A.
1s² 2s² 2p⁶ 3s¹
B.
1s² 2s² 2p⁶ 3s²
C.
1s² 2s² 2p⁶ 3s² 3p¹
D.
1s² 2s² 2p⁶ 3s² 3p²
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Solution
The electron configuration of potassium (K) is 1s² 2s² 2p⁶ 3s¹.
Correct Answer: A — 1s² 2s² 2p⁶ 3s¹
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Q. What is the electron configuration of the alkali metal potassium (K)?
A.
1s² 2s² 2p⁶ 3s¹
B.
1s² 2s² 2p⁶ 3s²
C.
1s² 2s² 2p⁶ 3s² 3p¹
D.
1s² 2s² 2p⁶ 3s² 3p²
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Solution
The electron configuration of potassium (K) is 1s² 2s² 2p⁶ 3s¹.
Correct Answer: A — 1s² 2s² 2p⁶ 3s¹
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Q. What is the electron configuration of the alkaline earth metal magnesium?
A.
1s² 2s² 2p⁶ 3s²
B.
1s² 2s² 2p⁶ 3s² 3p²
C.
1s² 2s² 2p⁶ 3s² 3p⁶
D.
1s² 2s² 2p⁶ 3s² 3p⁶ 4s²
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Solution
The electron configuration of magnesium (Mg) is 1s² 2s² 2p⁶ 3s².
Correct Answer: A — 1s² 2s² 2p⁶ 3s²
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Q. What is the electron configuration of the element with atomic number 12?
A.
1s2 2s2 2p6 3s2
B.
1s2 2s2 2p6 3s2 3p1
C.
1s2 2s2 2p6 3s2 3p6
D.
1s2 2s2 2p6 3s2 3d10
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Solution
The element with atomic number 12 is Magnesium (Mg) with the configuration 1s2 2s2 2p6 3s2.
Correct Answer: A — 1s2 2s2 2p6 3s2
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Q. What is the electron configuration of the s-block element magnesium?
A.
1s² 2s² 2p⁶ 3s²
B.
1s² 2s² 2p⁶ 3s² 3p¹
C.
1s² 2s² 2p⁶ 3s² 3p²
D.
1s² 2s² 2p⁶ 3s² 3d¹
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Solution
The electron configuration of magnesium (Mg) is 1s² 2s² 2p⁶ 3s².
Correct Answer: A — 1s² 2s² 2p⁶ 3s²
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