GK Questions and Answers on Chemistry

GK Questions and Answers on Chemistry – Some important questions are often seen in examinations. Some of the important 50 questions and their answers are given below which is important from the exam point of view.

By practicing more Chemistry MCQs with Answers Pdf Download, students can improve their speed and accuracy, which will help them on the exam. Online resources for study materials are everywhere, but it is up to the students to figure out what they actually need and select accordingly.

GK Questions and Answers on Chemistry

Question:  1 Who propounded the uncertainty principle?

Answer is –  Heisenberg

German theoretical physicist Werner Karl Heisenberg was a key figure in the development of quantum mechanics theory and led the Nazi nuclear weapons program during World War II. In 1925, he released his Umdeutung paper.

Question:  2 According to Dalton’s atomic theory which is the smallest particle that can live freely?

Answer is –  Atoms

according to Dalton’s Atomic Theory, the smallest indivisible particles of matter are called atoms

Question:  3 An atom has 9 electrons and 10 neutrons, what will be its mass number?

Answer is –  19

The mass no. of element = No. of protons + No. of neutrons = 9 + 10 = 19.

 Question:  4 An Indian scientist whose name is associated with a particle of a specific origin-

Answer is –  Boss

Bose is called the ‘Father of the God Particle’.

Question:  5 Atomic Electricity is –

Answer is –  Indifferent look

Nuclear energy is a form of energy released from the nucleus, the core of atoms, made up of protons and neutrons. This source of energy can be produced in two ways: fission – when nuclei of atoms split into several parts – or fusion

Question:  6 By the scattering of which rays the size of the nucleus can be estimated?

Answer is –  A particle

We can calculate the size of the nucleus, by obtaining the point of closest approach of an alpha particle. By shooting alpha particles of kinetic energy 5.5 MeV, the point of closest approach was estimated to be about 4×10-14m.

 Question:  7 Electronics do not pair until the empty cell received for them is exhausted, this rule is called-

Answer is –  Hundas rule

Hund’s rule.

Prior to pairing, electrons always go into an empty orbital. Electrons repel each other because they are negatively charged particles. They can lessen repulsion when they are in their orbitals.

Question:  8 If the third orbital of an atom is the outermost orbit, then what is the maximum number of electrons it can have?

Answer is –  18

Question:  9 In which of the following particles, the dipole nature of the beam wave is found?

Answer is –  Neutron

A neutron is a subatomic particle with a neutral charge and a mass slightly greater than a proton. Neutrons are found in the nucleus of every atom except for hydrogen. The symbol for a neutron is n or n⁰

 Question:  10 Positron is the replica of what?

Answer is –  Electron

Negatively charged subatomic particles, known as electrons, can be either free or attached to an atom. One of the atom’s three main sorts of particles is an electron that is bound to the atom.

Question:  11 Rutherford discovered the nucleus by studying the scattering of which from gold paper?

Answer is –  A particle

In 1911, Rutherford discovered the atomic nucleus, using a “scattering” experiment, diagramed at right, that would become a classic technique of particle physics.

Question:  12 Rutherford’s scattering proved the existence of

Answer is –  The nucleus of an atom

The majority of an atom’s mass and positive charge are concentrated in a very small volume, according to the Rutherford atomic model. He designated this area of the atom as the nucleus. Rutherford’s scattering thus demonstrated the existence of a nucleus.

Question:  13 The atomic number of an atom is Z and its mass number is M, then what will be the number of neutrons in its nucleus?

Answer is –  M-Z

Question:  14 The atomic number of an element is 35 and it has 14 electrons, then what will be the number of protons in it?

Answer is –  18

Question:  15 The atomic number of carbon is 6 and atomic weight is 12, then how many electrons are there in its nucleus?

Answer is –  6

Question:  16 The chemical behaviour of an atom depends on its –

Answer is –  On the number of electrons revolving around the nucleus

Question:  17 The difference between the mass and the mass number of an atom is called –

Answer is –  Mass loss

Question:  18 The electron was discovered by?

Answer is –  Thomson

Question:  19 The electronic configuration of an atom is 2,8,2, then what is the number of valence electrons in it?

Answer is –  2

Question:  20 The electronic configuration of an atom with atomic number 20 is-

Answer is –  2,8,8,2

Question:  21 The electronic number in an atom of atomic number Z and mass number A is?

Answer is –  Z

Question:  22 The nucleus of a chlorine atom of atomic number 17 and mass number 35 consists of

Answer is –  18 neutrons

Question:  23 The nucleus was discovered to be positive –

Answer is –  Rutherford

Question:  24 The total energy of an electron revolving in an atom –

Answer is –  Always positive

Question:  25 What are the basic particles in an atom in equal numbers?

Answer is –  Electron and Proton

Question:  26 What are the particles in the nucleus of an atom?

Answer is –  Electron and Neutron

Question:  27 What is the International Standard for Atomic Weight?

Answer is –  C-12

Question:  28 What is the mass number?

Answer is –  Proton and Neutron

Question:  29 What is the maximum number of atoms that an element can have in its second orbit?

Answer is –  8

Question:  30 What is the name of the scientist who detected the neutron?

Answer is –  Chadwick

Question:  31 What is the number of core electrons in sodium atom?

Answer is –  10

Question:  32 What is the smallest part of an element called?

Answer is –  Nuclear

Question:  33 What was discovered by James Chadwick?

Answer is –  Neutron

Question:  34 What will be the mass number of the element whose atom has 2 protons, 2 neutrons and 2 electrons?

Answer is –  4

Question:  35 When an electron moves from a higher orbit to a lower orbit,

Answer is –  Energy is released

More GK Question

Question:  36 Which atom does not have a single neutron in its nucleus?

Answer is –  Hydrogen

Question:  37 Which nuclear particle has no mass and charge, but spins?

Answer is –  Neutron

Question:  38 Which of the following electronic configuration is for a metallic element?

Answer is –  2,8,8,2

Question:  39Which of the following electronic structure belongs to sodium ion?

Answer is –  2,8

Question:  40 Which of the following is a chargeless particle?

Answer is –  Neutron

Question:  41 Which of the following is a floating particle?

Answer is –  Neutron

Question:  42 Which one correctly determines the atomic number of an element?

Answer is –  Number of protons

Question:  43 Who among the following propounded the atomic theory?

Answer is –  Dalton

Question:  44 Who discovered the atomic nucleus?

Answer is –  Rutherford

Question:  45 Who discovered the proton?

Answer is –  Rutherford

Question:  46 Who discovered the wave nature of electrons?

Answer is –  De Broglie

Question:  47 Who first proposed the atomic theory of matter?

Answer is –  John Dalton

uestion:  48 Who is the discoverer of positron?

Answer is –  Anderson

Question:  49 Who was the first to determine the charge of an electron?

Answer is –  Millikan

Question:  50 With respect to the molecule of a chemical element, the magnetic quantum number is related to-

Answer is –  By rotation

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