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WorksheetsAtoms and Molecules
Total questions: 10
Worksheet time: 3mins
Which of the following correctly represents 360g of water?
2 moles of water
0.2 moles of water
6.022 × 1023 molecules of water
1.2044 × 1025 molecules of water
Which of the following statements is not true about an atom?
Atoms are not able to exist independently.
Atoms are the basic units from which molecules and ions are
formed.
Atoms are always neutral in nature.
Atoms aggregate in large numbers to form the matter that we can see, feel or touch.
1 u or 1 amu means
1/12th mass of C-12 atoms
Mass of C-12 atom
Mass of O-16 atom
Mass of Hydrogen molecule
Which of the following contains maximum number of molecules?
19 CO2
1 g N2
1 g H2
1 g CH4
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
Las of Multiple Proportions
Law of Definite Proportions
Avogadros Law
An element X is divalent and another element Y is tetravalent. The compound formed by these two elements will be:
XY
XY2
X2Y
XY4
The molecular formula of potassium nitrate is ________.
KNO3
KNO
KNO2
KON
3.42 g of sucrose are dissolved in 18 g of water in a beaker. The numbers of oxygen atoms in the solution are:
6.68 ×1023
6.09 ×1022
6.022 ×1023
6.022 ×1021
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
All of the above
A change in the physical state can be brought about
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
