EASY
Earn 100

Define the atomic mass unit.
(a)Mass unit equal to exactly one-twelfth the mass of a carbon-12 atom
(b)Mass unit equal to exactly the mass of a carbon-12 atom
(c)Mass unit equal to exactly one-twelfth the mass of a Hydrogen atom
(d)All of the above

50% studentsanswered this correctly
Important Questions on Chemistry
MEDIUM
Identify the incorrect statement for the reaction is:
(Atomic mass of )

MEDIUM
The visible universe is estimated to contain stars. How many moles of stars are present in the visible universe.

EASY
The mass number and the volume of a nucleus is and respectively. If the mass number is increased to then the volume is changed to

MEDIUM
Which solution is isotonic with aqueous solution of urea? [Molar mass of Urea ]

HARD
The volume occupied by half a mole of a gas at standard temperature and pressure is:

MEDIUM
The reaction of the burning of carbon in oxygen is represented by equation
When 9.0 g of solid carbon is burnt in 16.0 g of oxygen gas the mass of carbon dioxide gas formed would be:
(Note: Atomic mass of C-12,o u, O=16.0 u)

MEDIUM
The atomic number of element having symbol is

MEDIUM
Dispersed medium + Dispersion medium =

EASY
Atomic mass of nitrogen is . Which of the following sample contain nitrogen atoms?

MEDIUM
The graph of versus (radius of a nucleus and mass number) is

EASY
One mole of dioxygen gas at is equal to

HARD
In a Davisson-Germer experiment, Helium atoms were used in place of electrons. What should be the energy of Helium so that a strong peak of scattered He appears at an angle of as was the case with electrons having an energy of (Take mass of atoms to be times the mass of electrons)

MEDIUM
Two samples A and B of a pure substance containing elements Y and Z are obtained from two different sources. of sample A contains of Z. Sample B is made of of Y by weight. This is an illustration of which of the following laws?

EASY
The phenomenon of scattering of light by colloidal particles is called ______.

EASY
What will be the mass of one atom of ?

MEDIUM
Among the following, the correct statement is:

MEDIUM
Which of the following is an example of emulsion ?

MEDIUM
Law of conservation of mass states that ______.

MEDIUM
Which of the following statement is not true about colloidal solution ?

