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Structure of Atom Questions for NEET. We covered all the Structure of Atom Questions for NEET in this post for free so that you can practice well for the exam.
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mcq on Structure of Atom for NEET Students
Which pair of compounds does not follow the Law of Multiple Proportions?
(a) NaCl and BaCl₂
(b) CaO and Na₂O
(c) H₃PO₄ and Ca₃(PO₄)₂
(d) NaCl and AgCl
Option d – NaCl and AgCl
Which elements show variable oxidation states? (A) Sodium (B) Chromium (C) Copper (D) Zinc
(a) A and B
(b) B and C
(c) C and D
(d) B and D
Option b – B and C
When substance A reacts with B to make AB, and with C to make A₂C, what will form when B and C react?
(a) B₂C
(b) BC
(c) BC₂
(d) B₃C
Option a – B₂C
Which element lacks two electrons in its K-shell?
(a) Hydrogen
(b) Helium
(c) Neon
(d) Sulphur
Option a – Hydrogen
If an element X forms an oxide represented by XO₃, what is the oxidation state of X?
(a) 1
(b) 2
(c) 3
(d) 6
Option c – 3
An element has atomic number 12. What is the correct formula of its azide compound?
(a) X₂N₃
(b) X(N₃)₂
(c) X₃N₂
(d) XN₃
Option c – X₃N₂
An element A has two valencies, 3 and 5. It reacts with another element B with valency 2. Which are the possible compound formulas?
(a) A₅B₃ and A₂B₅
(b) A₃B₂ and A₅B₂
(c) A₂B₃ and A₂B₅
(d) A₂B₃ and A₃B₅
Option c – A₂B₃ and A₂B₅
The formation of carbon monoxide and carbon dioxide from carbon and oxygen is explained by
(a) Law of conservation of Mass
(b) Law of multiple proportions
(c) Law of reciprocal proportions
(d) Law of definite proportions
Option b – Law of multiple proportions
What is the Mass of 3 moles of nitrogen atoms?
(a) 14 g
(b) 28 g
(c) 42 g
(d) 56 g
Option c – 42 g
Which pair is correctly associated?
(a) Mass spectrograph – Chadwick
(b) Atomic number – Moseley
(c) Neutron – Millikan
(d) Electron’s charge measurement – Aston
Option b – Atomic number – Moseley
An Atom has 7 electrons in its M shell and 18 neutrons in the nucleus. What is the total Mass number?
(a) 25
(b) 27
(c) 35
(d) 43
Option c – 35
A sample of ethyl ethanoate (CH₃COOC₂H₅) contains two oxygen atoms with the same number of electrons but different neutron counts. Why?
(a) One oxygen gained electrons
(b) One oxygen gained two neutrons
(c) The oxygen atoms are isotopes
(d) The oxygen atoms are isobars
Option c – The oxygen atoms are isotopes
In carbon disulphide (CS₂), the Mass of sulphur that reacts with 3 g of carbon is:
(a) 4 g
(b) 6 g
(c) 64 g
(d) 16 g
Option d – 16 g
How much carbon dioxide contains 3.011 × 10²³ molecules?
(a) 11 g
(b) 22 g
(c) 4.4 g
(d) 44 g
Option b – 22 g
Which element has equal numbers of protons, neutrons, and electrons?
(a) Aluminium
(b) Magnesium
(c) Phosphorus
(d) Chlorine
Option b – Magnesium
How many valence electrons are present in this element?
(a) 5
(b) 1
(c) 7
(d) 3
Option a – 5
Which of the following contains the greatest number of atoms?
(a) 71 g of Chlorine
(b) 48 g of Magnesium
(c) 127 g of Iodine
(d) 4 g of Hydrogen
Option d – 4 g of Hydrogen
What is the SI unit for measuring radioactivity?
(a) Curie
(b) Ohm
(c) Becquerel
(d) Roentgen
Option c – Becquerel
Which type of radiation carries a negative charge?
(a) Alpha rays
(b) Beta rays
(c) Gamma rays
(d) All of the above
Option b – Beta rays
The working principle behind the atomic bomb is
(a) Controlled nuclear fusion
(b) Uncontrolled nuclear fusion
(c) Controlled nuclear fission
(d) Uncontrolled nuclear fission
Option d – Uncontrolled nuclear fission
Radiocarbon dating helps determine the age of
(a) Fossils
(b) Wood
(c) Both fossils and wood
(d) None of these
Option c – Both fossils and wood
If a radioactive element has a half-life of 50 years, what portion remains after 150 years?
(a) 1/4
(b) 1/6
(c) 1/8
(d) 7/8
Option d – 7/8
Which of the following has the greatest Mass?
(a) 0.2 moles of sucrose (C₁₂H₂₂O₁₁)
(b) 2 moles of carbon dioxide
(c) 2 moles of calcium carbonate
(d) 10 moles of water
Option b – 2 moles of carbon dioxide
Which one is not considered a fundamental particle of an element?
(a) Atom
(b) Molecule
(c) Ion
(d) None of these
Option b – Molecule
Which group displays similar chemical characteristics?
(a) Isotopes
(b) Isobars
(c) Allotropes
(d) Both isotopes and allotropes
Option c – Allotropes
Which natural process confirms that atoms can be divided?
(a) Allotropy
(b) Radioactivity
(c) Cracking
(d) None of these
Option b – Radioactivity
During cathode ray experiments, no current was observed under normal conditions. What explains this?
(a) Presence of dust in the air
(b) Presence of CO₂ in the air
(c) Air is not a good conductor of Electricity in normal conditions
(d) None of the above
Option c – Air is not a good conductor of Electricity in normal conditions
The glow seen on the inner wall of a discharge tube is caused by
(a) Cathode rays
(b) Anode rays
(c) Canal rays
(d) None of these
Option a – Cathode rays
Identify the incorrect electronic configuration:
(a) Beryllium (4) = 2, 2
(b) Oxygen (8) = 2, 6
(c) Sulphur (16) = 2, 6, 8
(d) Phosphorus (15) = 2, 8, 5
Option c – Sulphur (16) = 2, 6, 8
Which of the following is not a correct statement?
(a) Atoms mostly consist of empty space
(b) In neutral atoms, protons and neutrons are always equal in number
(c) The number of protons equals the number of electrons in a neutral Atom
(d) Maximum electrons in a shell are given by the formula 2n²
Option b – In neutral atoms, protons and neutrons are always equal in number
Which particle has a single positive charge and a Mass of 1 atomic Mass unit?
(a) Neutron
(b) Proton
(c) Electron
(d) Helium nucleus
Option b – Proton
Which isotope is used as the reference standard for atomic Mass?
(a) Carbon-12
(b) Oxygen-16
(c) Carbon-13
(d) Hydrogen-1
Option a – Carbon-12
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