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WorksheetsChemistry
Total questions: 15
Worksheet time: 6mins
1u or 1 amu means
1/12th mass of C-12 atoms
Mass of C -12 atoms
Mass of O -16 atoms
Mass of hydrogen molecule
A sample of NH3 molecule irrespective of source contains 82.35% nitrogen and 17.65% of hydrogen by mass.This data supports :
Law of conservation of mass
Law of multiple proportions
Law of definite proportions
Avogadro's law
An element X is divalent and another element Y tetravalent.The compound formed by these two element will be :
XY
XY2
X2Y
XY4
The molecular formula of potassium nitrate is:
KNO3
KNO
KNO2
KON
Molecular mass is defined as the :
Mass of one molecule of any substance compared with the mass of one atom of C - 12
Mass of one atom compared with the mass of one atom of hydrogen
Mass of one atom compared with the mass of one molecule
None of the above
The atomic mass of sodium is 23. The number of moles in 46g of sodium is :
4
2
0
1/2
Which of the following represents a correct chemical formula ?
CaCl
BiPO4
NaSO4
NaS
What is the formula mass unit of ZnO?
18u
81u
88u
188u
Which of the following represents the correct relation between Avogadro's number ( No), number of particles ( N) and moles (n)?
n = N /No
n = No/N
n = N No
All are correct
Who laid the foundation of laws of chemical combination ?
Dalton
Lavoisier
Proust
Democritus
Who introduced the term "mole" in chemistry?
John dalton
Amedeo avogadro
Lavoisier
Wilhelm ostwald
The chemical symbol for sodium is
So
Sd
NA
Na
The chemical symbol for nitrogen gas is
Ni
N2
N+
N
Which of the following has maximum number of atom ?
18g of H2O
18g of O2
18g of CO2
18g of CH4
Which the following contains maximum number of molecules?
1g CO2
1g N2
1g H2
1g CH4
