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Structure of Atom — NEET Chemistry MCQs

30 questions written by hand against the NCERT chapter. Every wrong option is explained, not just the right one.

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Sample questions from this chapter

Which observation about cathode rays showed that electrons are constituents of every atom?
  1. Their properties were independent of the electrode material and gas in the tube ✓
  2. Their mass changed when the gas in the tube was changed
  3. They travelled from the anode towards the cathode
  4. They were undeflected by electric and magnetic fields
Answer: A. The same cathode-ray particles appeared with different gases and electrodes, showing that electrons are universal atomic constituents. Gas-dependent mass is the contrasting canal-ray result.
Why not B: Dependence on the gas is a property of positive canal-ray ions, not cathode-ray electrons.
Why not C: Cathode rays originate at the negative cathode and move towards the anode.
Why not D: Their deflection towards the positive plate is evidence that they carry negative charge.
A species contains 16 protons, 16 neutrons and 18 electrons. Which symbol describes it?
  1. 34S2-
  2. 32S2+
  3. 32S2- ✓
  4. 34Ar2-
Answer: C. Z = 16 identifies sulphur, A = 16 + 16 = 32, and two more electrons than protons give charge 2−. The common trap wrongly includes electrons in mass number.
Why not A: Adding electrons to nucleons incorrectly gives mass number 34; electrons do not contribute to A.
Why not B: Two excess electrons produce a 2− charge, not a 2+ charge.
Why not D: The element is fixed by 16 protons as sulphur, whereas argon has atomic number 18.
A metal has threshold frequency 5.0 × 10^14 Hz. What maximum kinetic energy is produced by light of frequency 8.0 × 10^14 Hz? Use h = 6.63 × 10^-34 J s.
  1. 0.000000000000000000199 J ✓
  2. 0.000000000000000000530 J
  3. 0.000000000000000000332 J
  4. 0.000000000000000000862 J
Answer: A. Einstein's equation gives Kmax = h(ν − ν₀) = 6.63 × 10^-34 × 3.0 × 10^14 = 1.99 × 10^-19 J. The larger traps omit or reverse the threshold subtraction.
Why not B: This uses hν and reports the entire photon energy without subtracting the work function hν₀.
Why not C: This calculates hν₀, the metal's work function, rather than the photoelectron kinetic energy.
Why not D: This uses h(ν + ν₀), adding the threshold frequency when it must be subtracted.

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Questions

How many NEET questions are there on Structure of Atom?

This chapter test has 30 questions — 10 easy, 14 medium and 6 hard — all written against the NCERT Class 11 chapter.

Is this NEET Chemistry chapter test free?

Yes. Every chapter test is free with no login, and you get your all-India rank on every one. Nothing on the site is on sale right now.

Do the questions explain the wrong options?

Yes — every distractor carries its own explanation naming the specific misconception that makes a student pick it. That is the part most question banks skip, and it is the part that changes your next attempt.