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IX Regular 2
nd
Batch
Atoms & Molecules
Check below the important MCQs on Atoms and Molecules:
1
...
022 × 1023 molecules of water
(iv) 1
...
(d) (ii) and (iv)
2
...
(b) Atoms are the basic units from which molecules and ions are
formed
...
(d) Atoms aggregate in large numbers to form the matter that we can see, feel or touch
...
(d) Atoms aggregate in large numbers to form the matter that we can see, feel or touch
...
1 u or 1 amu means
(a) 1/12th mass of C-12 atoms
(b) Mass of C-12 atom
(c) Mass of O-16 atom
(d) Mass of Hydrogen molecule
Answer
...
Which of the following contains maximum number of molecules?
(a) 19 CO2
(b) 1 g N2
(c) 1 g H2
(d) 1 g CH4
Answer
...
A sample of NH3 molecule irrespective of source contains 82
...
65% of
Hydrogen by mass
...
(c) Law of Definite Proportions
6
...
The compound formed by these two
elements will be:
(a) XY
(b) XY2
(c) X2Y
(d) XY4
Answer
...
The molecular formula of potassium nitrate is ________
...
(a) KNO3
8
...
42 g of sucrose are dissolved in 18 g of water in a beaker
...
68 ×1023
(b) 6
...
022 ×1023
(d) 6
...
(a) 6
...
Molecular mass is defined as the:
(a) Mass of one molecule of any substance compared with the mass of one atom of C – 12
(b) Mass of one atom compared with the mass of one atom of hydrogen
(c) Mass of one atom compared with the mass of one molecule
(d) None of the above
Answer
...
A change in the physical state can be brought about
(a) only when energy is given to the system
(b) only when energy is taken out from the system
(c) When energy is either given to, or taken out from the system
(d) Without any energy change
Answer
...
The atomic mass of sodium is 23
...
(a) 4
(b) 2
(c) 0
(d) ½
Answer
...
Which of the following represents a correct chemical formula?
(a) CaCl
(b) BiPO4
(c) NaSO4
(d) NaS
Answer
...
What is the formula mass unit of ZnO?
(a) 18 u
(b) 81 u
(c) 88 u
(d) 188 u
Answer
...
How many atoms of oxygen are present in 300 grams of CaCO3?
(a) 54
...
207 × 1023
(c) 12
...
2 × 1023
Answer
...
207 × 1023
15
...
(a) n = N / No