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Metallurgy and Isolation of Elements WBJEE MCQ & Practice Questions

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Metallurgy and Isolation of Elements Revision Guide for WBJEE Chemistry

Metallurgy and Isolation of Elements is part of WBJEE Chemistry preparation. A strong revision plan should combine concept review with exam-style questions so that definitions, relationships, calculations and exceptions are recalled accurately.

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Important Topics

  • Core definitions and principles
  • Important equations or relationships
  • Common applications and examples
  • Frequently confused concepts
  • Exam-style multiple-choice questions
  • Error review and targeted revision

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Top 20 Metallurgy and Isolation of Elements MCQs with Answers

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WBJEE Chemistry · Metallurgy and Isolation of Elements · Very Very Hard

1. Which fundamental condition must be respected in solving Metallurgy and Isolation of Elements problems?

  • A. Assume coefficients are one
  • B. Ignore limiting conditions
  • C. Conservation of atoms and charge
  • D. Ignore units
Answer: C
Explanation: Atom and charge conservation are fundamental.

WBJEE Chemistry · Metallurgy and Isolation of Elements · Very Very Hard

2. At dynamic equilibrium relevant to Metallurgy and Isolation of Elements:

  • A. Catalyst is consumed
  • B. Forward and reverse rates are equal
  • C. All molecular motion stops
  • D. Concentrations must be equal
Answer: B
Explanation: At equilibrium forward and reverse rates are equal.

WBJEE Chemistry · Metallurgy and Isolation of Elements · Very Very Hard

3. At constant T and P a spontaneous process has:

  • A. ΔG<0
  • B. ΔG>0
  • C. ΔG=0 always
  • D. ΔH=0
Answer: A
Explanation: Spontaneity requires ΔG<0.

WBJEE Chemistry · Metallurgy and Isolation of Elements · Very Very Hard

4. A catalyst in Metallurgy and Isolation of Elements generally:

  • A. Changes ΔG°
  • B. Changes ΔH
  • C. Changes K at fixed T
  • D. Lowers activation energy without changing K at fixed T
Answer: D
Explanation: Catalysts affect kinetics, not equilibrium thermodynamics.

WBJEE Chemistry · Metallurgy and Isolation of Elements · Very Very Hard

5. Oxidation means:

  • A. No oxidation-number change
  • B. Gain of protons
  • C. Loss of electrons
  • D. Gain of electrons
Answer: C
Explanation: Oxidation is electron loss.

WBJEE Chemistry · Metallurgy and Isolation of Elements · Very Very Hard

6. Reduction means:

  • A. Loss of protons
  • B. Gain of electrons
  • C. Loss of electrons
  • D. Increase in oxidation number
Answer: B
Explanation: Reduction is electron gain.

WBJEE Chemistry · Metallurgy and Isolation of Elements · Very Very Hard

7. A Lewis acid is:

  • A. Electron-pair acceptor
  • B. Electron-pair donor
  • C. Always proton donor
  • D. Always anion
Answer: A
Explanation: Lewis acids accept electron pairs.

WBJEE Chemistry · Metallurgy and Isolation of Elements · Very Very Hard

8. A Lewis base is:

  • A. Electron-pair acceptor
  • B. Always cation
  • C. Always oxidant
  • D. Electron-pair donor
Answer: D
Explanation: Lewis bases donate electron pairs.

WBJEE Chemistry · Metallurgy and Isolation of Elements · Very Very Hard

9. Which is a state function?

  • A. Work
  • B. Path length
  • C. Enthalpy
  • D. Heat
Answer: C
Explanation: Enthalpy is a state function.

WBJEE Chemistry · Metallurgy and Isolation of Elements · Very Very Hard

10. The correct relation is:

  • A. ΔG°=RT/K
  • B. ΔG°=-RT lnK
  • C. ΔG°=RT lnK
  • D. ΔG°=-KRT
Answer: B
Explanation: ΔG°=-RTlnK.

WBJEE Chemistry · Metallurgy and Isolation of Elements · Very Very Hard

11. For a first-order process, half-life is:

  • A. 0.693/k
  • B. k/0.693
  • C. 1/(k[A]0)
  • D. [A]0/(2k)
Answer: A
Explanation: t1/2=0.693/k.

WBJEE Chemistry · Metallurgy and Isolation of Elements · Very Very Hard

12. Arrhenius equation is:

  • A. k=Ae^(Ea/RT)
  • B. k=EaRT
  • C. k=A/RT
  • D. k=Ae^(-Ea/RT)
Answer: D
Explanation: Arrhenius equation relates k, Ea and T.

WBJEE Chemistry · Metallurgy and Isolation of Elements · Very Very Hard

13. 0.20 mol solute in 0.50 L solution has molarity:

  • A. 2.50 M
  • B. 0.70 M
  • C. 0.40 M
  • D. 0.10 M
Answer: C
Explanation: M=0.20/0.50=0.40 M.

WBJEE Chemistry · Metallurgy and Isolation of Elements · Very Very Hard

14. For a weak acid, larger Ka means:

  • A. Stronger conjugate acid
  • B. Stronger acid
  • C. Weaker acid
  • D. No ionisation
Answer: B
Explanation: Larger Ka means greater ionisation.

WBJEE Chemistry · Metallurgy and Isolation of Elements · Very Very Hard

15. At 25°C:

  • A. pH+pOH=14
  • B. pH+pOH=7
  • C. pH=pOH always
  • D. pH+pOH=1
Answer: A
Explanation: pH+pOH=pKw=14.

WBJEE Chemistry · Metallurgy and Isolation of Elements · Very Very Hard

16. Oxidation in an electrochemical cell occurs at:

  • A. Cathode
  • B. Salt bridge
  • C. Wire
  • D. Anode
Answer: D
Explanation: Oxidation occurs at the anode.

WBJEE Chemistry · Metallurgy and Isolation of Elements · Very Very Hard

17. Reduction in an electrochemical cell occurs at:

  • A. Salt bridge
  • B. Wire
  • C. Cathode
  • D. Anode
Answer: C
Explanation: Reduction occurs at the cathode.

WBJEE Chemistry · Metallurgy and Isolation of Elements · Very Very Hard

18. Positive E°cell implies:

  • A. No spontaneous reaction
  • B. ΔG°<0
  • C. ΔG°>0
  • D. K<1 necessarily
Answer: B
Explanation: ΔG°=-nFE°.

WBJEE Chemistry · Metallurgy and Isolation of Elements · Very Very Hard

19. Higher bond order generally gives:

  • A. Shorter stronger bond
  • B. Longer weaker bond
  • C. Longer stronger bond
  • D. No effect
Answer: A
Explanation: Higher bond order strengthens and shortens bonds.

WBJEE Chemistry · Metallurgy and Isolation of Elements · Very Very Hard

20. A nucleophile is:

  • A. Electron-pair acceptor
  • B. Always positive
  • C. Always radical
  • D. Electron-pair donor
Answer: D
Explanation: Nucleophiles donate electron pairs.

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Metallurgy and Isolation of Elements Frequently Asked Questions

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