NCERT Solutions for class 11 Chemistry | Chapter : Structure of Atom
Questions
1
How many orbitals can have the following set of quantum numbers, n = 3, l = 1, m1 = 0 ?
Answer:1
2
Electronic configuration of the outer shell of the element Gd with atomic number 64 is
Answer:4f7 5d1 6s2
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4
The orientation of atomic orbitals depends on their
Answer:magnetic quantum number
5
A gas X has Cp and Cv ratio as 1.4, at NTP 11.2 L of gas X will contain_______ number of atoms
Answer:6.02 × 1023
7
The excitation energy of a hydrogen atom from its ground state to its third excited state is
Answer: 12.75 eV
9
A 0.66 kg ball is moving with a speed of 100 m/s. Find its wavelength
Answer:1.0 × 10-35 m
10
If an atom has four unpaired electrons. What is likely to be the total spin of the electron?
Answer: 2
11
The electronic configuration for oxygen is written as 1s2 2s2 2p4. Which rule will this configuration be violating?
Answer:None of the above.
12
What is the sequence to label the subshells in an atom?
Answer:S, p, d, f, g
13
The isotopes of a neutral atom of an element differ in which of these?
Answer:Atomic number.
14
The maximum mass of an atom is concentrated in which of these?
Answer:Nucleus.
15
An atom differs from an ion with respect to which of the following?
Answer: Number of electrons.
16
The electronic configuration of atomic number 20 of an atom is which of the following?
Answer: 2, 8, 8, 2
18
What happens to the atomic number during a chemical reaction?
Answer: Remains the same.
19
Atoms that have the same mass number and different atomic number are called?
Answer:Isotopes
20
Which of the following determines the chemical properties?
Answer:Number of electrons.
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