English

A change in the physical state can be brought about

Advertisements
Advertisements

Question

A change in the physical state can be brought about

Options

  • only when energy is given to the system

  • only when energy is taken out from the system

  • when energy is either given to or taken out from the system

  • without any energy change

MCQ
Advertisements

Solution

when energy is either given to or taken out from the system

When energy is given to the system the solid state changes to liquid. When energy is taken out from a liquid it changes to solid e.g., ice changes to water and water to water vapours when heat energy is given. Water vapours or steam condense to water and water freezes to ice when energy is decreased.

shaalaa.com
  Is there an error in this question or solution?
Chapter 3: Atoms and Molecules - Multiple Choice Questions [Page 20]

APPEARS IN

NCERT Exemplar Science Exemplar [English] Class 9
Chapter 3 Atoms and Molecules
Multiple Choice Questions | Q 10. | Page 20

RELATED QUESTIONS

TRUE \ FALSE

Elements having a tendency to accept electrons are called metals

 


TRUE \ FALSE

Neils Bohr gave the theory to explain the arrangement of protons in an atom.


WRITE SHORT ANSWER

What is radioactivity?


Define:- Molecule


Define:- Radicals


 Name the particles which revolve around the nucleus.


Define: Covalent bond


An atom has 13 protons and 14 neutrons.

What is the atomic number of the atom ?


A certain particle ‘X’ has 17 protons, 18 electrons and 20 neutrons.

What is the atomic numebr of X ?


Name the unit in which the radius of an atom is usually expressed.


An atom of element E contains 3 protons, 3 electrons and 4 neutrons :
(a) What is its atomic number?
(b) What is its mass number?
(c) Write the electronic configuration of the element E.
(d) State whether element E is a metal or non-metal. Why?
(e) What type of ion, cation or anion, will be formed by an atom of element E? Why
(f) Write the symbol of the ion formed by an atom of element E.
(g) What could element X be?


Elements X and Y have 1 and 7 electrons in their outermost shell respectively.

Which will form positive ion?


Select the correct answer to the statement given below:

The basic unit of matter is not capable of independent existence.


The electronic structure [configuration] of fluorine can be written as 2, 7. In a similar way give the electronic configuration of phosphorus


K: Potassium:: C: ______.


The volume occupied by 1 mole of a diatomic gas at S.T.P is ______


Atoms of different elements having ______ mass numbers, but ______ atomic numbers are called isobars. 


Atoms of one element can be transmuted into atoms of other elements by ______


A sample of vitamic C is known to contain 2.58 ×1024 oxygen atoms. How many moles of oxygen atoms are present in the sample?


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×