Chemistry Reaction Mechanisms Quiz

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Questions and Answers

What is the volume of CO2 produced at STP when 0.42 g of Mg2C3 reacts with water?

112 mL

450 mL

448 mL

336 mL (correct)

Why are lower oxidation state compounds more stable in groups 13 and 14 as you move down the group?

I, II, III (correct)

IV only

I & II

III & IV

Given the mechanism 2A ⇌ B followed by B + C ⟶ P, what is the expression for the overall rate?

K[A][B]

KKf[A]2[C] (correct)

Kf[B][C]

KKf[A]2[C][B]

What product is obtained from pyrolyzing 2-methyl xanthate?

1-phenylcyclohexene Signup and view all the answers

What colourless gas with an irritating smell is produced from the reaction of [X] and dilute H2SO4?

H2S Signup and view all the answers

What is the primary mechanism that determines the rate law for the reaction involving A and C producing P?

The entire mechanism influences the rate due to its multistep nature. Signup and view all the answers

Which statement correctly describes the change in stability of oxidation states as elements move down a group?

Lower oxidation states become more stable due to increasing atomic size. Signup and view all the answers

What primarily causes the color of potassium dichromate?

d-d transition Signup and view all the answers

Which of the following statements about metal carbonyl [M(CO)6] is correct?

d𝜋 − p𝜋 back bonding occurs from the filled metal orbitals. Signup and view all the answers

Which option correctly describes the Haworth projection for 𝛼 − D glucopyranose?

The hydroxyl group on carbon 1 is in the axial position. Signup and view all the answers

Which statement is true regarding the neutral oxide NO?

NO is a neutral oxide that combines with oxygen to form nitrogen dioxide. Signup and view all the answers

What kind of bonding interaction occurs in metal carbonyl complexes?

Both σ and π bonding through back donation Signup and view all the answers

For the given metal carbonyl complex, which statement about C−O bond lengths is accurate?

C−O bond length is shorter in the complex than in CO gas. Signup and view all the answers

Which bonding characteristic is primarily associated with ligand-to-metal charge transfer?

Transfer of electron density from ligands to metal Signup and view all the answers

In the context of back bonding, what is the effect on the bond strength in metal carbonyl complexes?

Back bonding strengthens the M−CO bond. Signup and view all the answers

Which statement about the hydroxyl groups in α-D-glucopyranose is accurate?

Only the hydroxyl group on carbon 1 is above the ring plane. Signup and view all the answers

What is the bond order of the P − O bond in PO4−4?

0.75 Signup and view all the answers

Which compound is not typically formed through a reaction with ArCN?

ArCONH2 + P2 O5 Signup and view all the answers

In the dehydrobromination of 3-bromo-3-cyclopentylhexane using alcoholic KOH, how many distinct alkenes including geometrical isomers can be formed?

4 Signup and view all the answers

Which of the following statements about the cleavage of CH4 with Cl2 is true?

The reaction primarily features Cl2 dissociating into Cl·. Signup and view all the answers

Which type of bond is formed between two α-amino acids?

Amide bond Signup and view all the answers

Which of the following compounds is likely to produce CrO2Cl2 when treated with NaCl and conc. H2SO4?

K2Cr2O7 Signup and view all the answers

What is the correct order of equivalent conductance at infinite dilution for LiCl, NaCl, and KCl?

KCl > NaCl > LiCl Signup and view all the answers

Which of the following cations exhibits aromatic character?

C6H5+ Signup and view all the answers

What is the correct product when an orange compound is treated with NaCl and concentrated H2SO4?

CrO2Cl2 Signup and view all the answers

Study Notes

Section A - Single Answer Correct Type

Question 1: 0.42 g of Mg₂C₃ reacts with water producing gas X. Gas X combines with O₂ to yield CO₂. The volume of CO₂ at STP is 336 mL. (Given: Molar mass of Mg = 24 g, C = 12 g, O = 16 g; volume of one mole of gas at STP is 22.4 L).
Question 2: In groups 13 and 14, lower oxidation state compounds are more stable as the atomic number increases down the group because: (1) Ionization energy decreases, (2) poor shielding by s and p electrons compared to d and f electrons, (3) electronegativity decreases.
Question 3: The overall rate law for the reaction 2A + C → P with the given mechanism is Kf[B][C]. [ 2A = B is an equilibrium step with constant K].
Question 4: cis-2-phenylcyclohexanol on pyrolysis gives 1-phenylcyclohexene.

Section B - Integer/Numerical Value Type

Question 1: The volume ratio of gases formed at the anode and cathode during the electrolysis of CH₃COONa(aq) is 1:1.
Question 2: The isoelectric point (pI) for lysine is 9.74. pKa₁ values are 2.18, 8.95, and 10.53.
Question 3: A current of 0.55 Amp deposits 0.55 g of a metal in 100 minutes. Equivalent weight of the metal is given and must be known to compute the atomic mass.
**Question 4:**The pH of a 0.01M (NH₄)₂SO₄ and 0.02M NH₄OH buffer with a pKa of NH₄+ = 9.26 is not given.
Question 5: For the equilibrium NH₂COONH₄(s) ⇌ 2NH₃(g) + CO₂(g), if the total pressure at equilibrium is 3 atm, the Kp value is not calculated in the provided information.

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Test your understanding of chemical reactions and mechanisms with this comprehensive quiz. Covering topics such as gas laws, oxidation states, and reaction kinetics, this quiz is perfect for chemistry students looking to challenge their knowledge. Dive in and see how well you know your chemistry!