Have an account?
Skip to Content
10 questions
Show Answers
See Preview
- Multiple ChoicePlease save your changes before editing any questions.
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
- Multiple ChoicePlease save your changes before editing any questions.
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.
- Multiple ChoicePlease save your changes before editing any questions.
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
- Multiple ChoicePlease save your changes before editing any questions.
Which of the following contains maximum number of molecules?
19 CO2
1 g N2
1 g H2
1 g CH4
- Multiple ChoicePlease save your changes before editing any questions.
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
- Multiple ChoicePlease save your changes before editing any questions.
An element X is divalent and another element Y is tetravalent. The compound formed by these two elements will be:
XY
XY2
X2Y
XY4
- Multiple ChoicePlease save your changes before editing any questions.
The molecular formula of potassium nitrate is ________.
KNO3
KNO
KNO2
KON
- Multiple ChoicePlease save your changes before editing any questions.
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
- Multiple ChoicePlease save your changes before editing any questions.
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
- Multiple ChoicePlease save your changes before editing any questions.
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