EASY
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Define the atomic mass unit.

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Important Questions on Chemistry

MEDIUM

Identify the incorrect statement for the reaction 2H2S+SO2  3S+2H2O is:

(Atomic mass of S=32)

MEDIUM

The visible universe is estimated to contain 1022 stars. How many moles of stars are present in the visible universe.

 

EASY
The mass number and the volume of a nucleus is M and V respectively. If the mass number is increased to 2 M then the volume is changed to
MEDIUM
Which solution is isotonic with 6% w/v aqueous solution of urea? [Molar mass of Urea=60 gm. mol-1 ]
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

C(s)+O2(g)  CO2(g)+Heat+Light

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)

 

 

EASY
Atomic mass of nitrogen is 14 u. Which of the following sample contain 6.022×1023 nitrogen atoms?
MEDIUM
The graph of lnRR0 versus lnA (R=radius of a nucleus and A=mass number) is
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 50°, as was the case with electrons having an energy of 54 eV? (Take mass of He atoms to be 7500 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. 5g of sample A contains 1.25g of Z. Sample B is made of 75% 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 ______.

MEDIUM

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