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 of the following compounds do not conform to the Law of Multiple Proportions?
(a) NaCl and BaCl2
(b) CaO and Na20
(c) H3PO4 and Ca3(PO4)2
(d) NaCl and AgCl
Option d – NaCl and AgCl
Which of the following exhibit variable valency? (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)
In a chemical reaction, A combines with B to form AB with C to form A2C. What would be obtained if B and C combine together?
(a) B2C
(b) BC
(c) BC2
(d) B3C
Option a – B2C
Which one of the following elements does not have two electrons in the K-shell?
(a) Hydrogen
(b) Helium
(c) Neon
(d) Sulphur
Option a – Hydrogen
An element X forms an oxide XO3. What is the valency of X?
(a) 1
(b) 2
(c) 3
(d) 6
Option c – 3
The atomic number of an element X is 12. What is the formula of its azide?
(a) X₂N3
(b) X (N3)₂
(c) X3N₂
(d) XN3
Option c – X3N₂
An element A has valencies equal to 3 and 5. It combines with another element B having valency equal to 2. What are the formulae of the compounds thus formed?
(a) A5B3 and A₂B5
(b) A3B2 and A5B₂
(c) A₂B3 and A₂B5
(d) A₂B3 and A3 B5
Option c – A₂B3 and A₂B5
Which one of the following laws explains the formation of carbon monoxide and carbon dioxide from carbon and oxygen?
(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 (in grams) of 3 moles of N?
(a) 14
(b) 28
(c) 42
(d) 56
Option c – 42
Which one of the following pairs is correctly matched?
(a) Mass Spectrograph – Chadwick
(b) Atomic number – Moseley
(c) Neutron – Millikan
(d) Measurement of charge of – Aston an electron
Option b – Atomic number – Moseley
An atom has 7 electrons in its M-shell and contains 18 neutrons in its nucleus. What is its mass number?
(a) 25
(b) 27
(c) 35
(d) 43
Option c – 35
In a sample of ethyl ethanoate (CH3COOC₂H5) the two oxygen atoms have the same number of electrons but a different number of neutrons. Which of the following is the correct reason for it?
(a) One of the oxygen atoms has gained electrons
(b) One of the oxygen atoms has gained two neutrons
(c) The two oxygen atoms are isotopes
(d) The two oxygen atoms are isobars
Option c – The two oxygen atoms are isotopes
In carbon disulphide (CS₂), the mass of sulphur in combination with 3.0 g of carbon is :
(a) 4.0 g
(b) 6.0 g
(c) 64.0 g
(d) 16.0 g
Option d – 16.0 g
What mass of carbon dioxide (CO₂) will contain 3.011 x 1023 molecules?
(a) 11.0 g
(b) 22.0 g
(c) 4.4 g
(d) 44.0 g
Option b – 22.0 g
Which of the following elements has the same number of protons, electrons, and neutrons?
(a) Al
(b) Mg
(c) P
(d) Cl
Option b – Mg
No. of valence electrons in an element is :
(a) 5
(b) 1
(c) 7
(d) 3
Option a – 5
Which one of the following has the largest 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 of radioactivity?
(a) curie
(b) ohm
(c) Becquerel
(d) Roentgen
Option c – Becquerel
Which of the following rays is negatively charged?
(a) a Rays
(b) b Rays
(c) g Rays
(d) All of the above
Option b – b Rays
Atom Bomb is based on the principle of
(a) Controlled Nuclear Fusion
(b) Uncontrolled Nuclear Fusion
(c) Controlled Nuclear Fission
(d) Uncontrolled Nuclear Fission
Option d – Uncontrolled Nuclear Fission
Radiocarbon Dating is used for the age determination of
(a) Fossils
(b) Wood
(c) Both 1 & 2
(d) None of these
Option c – Both 1 & 2
If the half-life of a radioactive substance is 50 years what fraction will be left after 150 years if starts with the original amount?
(a) 1/4
(b) 1/6
(c) 7/8
(d) 7/4
Option c – 7/8
Which of the following would weigh the highest?
(a) 0.2 mole of sucrose (C12 H22 O11)
(b) 2 moles of CO₂
(c) 2 moles of CaCO3
(d) 10 moles of H₂O
Option c – 2 moles of CaCO3
Which of the following is not a basic particle of an element?
(a) An atom
(b) A molecule
(c) An ion
(d) None of these
Option b – A molecule
Members of which of the following have similar chemical properties?
(a) isotope
(b) isobars
(c) allotropes
(d) both isotopes and allotropes
Option c – allotropes
A natural phenomenon that supports the experimental conclusion that atoms are divisible is
(a) allotropy
(b) radioactivity
(c) cracking
(d) None of these
Option b – radioactivity
While performing cathode ray experiments, it was observed that there was no passage of electric current under normal conditions. Which of the following can account for this observation?
(a) Dust particles are present in the air
(b) Carbon dioxide is present in the air
(c) Air is a poor conductor of electricity under normal conditions
(d) None of the above
Option c – Air is a poor conductor of electricity under normal conditions
The fluorescence on the walls of the discharge tube is due to
(a) cathode rays
(b) anode rays
(c) canal rays
(d) None of the above
Option a – cathode rays
Which of the following electronic configurations is wrong
(a) Be (d) = 2, 2
(b) 0 (8) = 2,6
(c) S (16) = 2, 6, 8
(d) P (15) = 2, 8, 5
Option c – S (16) = 2, 6, 8
Which one of the following statements is not true?
(a) Most of the space in an atom is empty
(b) The total number of neutrons and protons is always equal in a neutral atom
(c) The total number of electrons and protons in an atom is always equal
(d) The total number of electrons in any energy level can be calculated by the formula 2n2
Option b – The total number of neutrons and protons is always equal in a neutral atom
Which of the following has a charge of +1 and a mass of 1 AMU?
(a) A neutron
(b) A proton
(c) An electron
(d) A helium nucleus
Option b – A proton
Which of the following isotopes is used as the standard for atomic mass? ( Structure of Atom Questions for NEET )
(a) 12C
(b) 16O
(c) 13C
(d) 1H
Option a – 12C
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