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Q. No.
Assertion (A): 1 g O2 and 1 g O3  have an equal number of oxygen atoms.
Reason (R): O2  and  O3  have different molar masses.
 
1. Both (A) and (R) are True and (R) is the correct explanation of (A).
2. Both (A) and (R) are True but (R) is not the correct explanation of (A).
3. (A) is True but (R) is False.
4. (A) is False but (R) is True.
Subtopic:  Moles, Atoms & Electrons |
Level 3: 35%-60%
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Match the following physical quantities with units.

Physical quantity Unit
A. Molarity (i) mol kg–1 
B.  Molality (ii) mol L–1
C.  Pressure (iii) Candella
D. Luminous intensity (iv) Pascal

Codes:

A B C D
1. (i) (iv) (ii) (iii)
2. (ii) (i) (iv) (iii)
3. (i) (iv) (iii) (ii)
4. (iv) (i) (iii) (ii)
Subtopic:  Introduction |
 93%
Level 1: 80%+
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Match the prefixes given in List-I with their corresponding powers of ten in List-II, and choose the correct option.
List-I List-II
a. Micro i.  10-15 m
b. Mega ii.  10-6 m
c. Giga iii.  106 m
d. Femto iv.  109 m
Codes:
a b c d
1. i iv iii ii
2. iii iv ii i
3. ii iii iv i
4. i iii iv ii
Subtopic:  Introduction |
 85%
Level 1: 80%+
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At 100 ºC and 1 atm, if the density of liquid water is 1.0 g cm–3 and that of water vapor is 0.0006 g cm-3, then the volume occupied by water molecules in 1 litre of steam at that temperature will be:

1. 6 cm3  2. 60 cm3
3. 0.6 cm3  4. 0.06 cm3
Subtopic:  Moles, Atoms & Electrons |
 60%
Level 2: 60%+
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Which of the following values is closest to the density of CCl₄ vapour (in g/L) at STP? 

1.  8.67

2.  6.87

3.  3.67

4.  4.26

Subtopic:  Concentration Based Problem |
 76%
Level 2: 60%+
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Find the Celsius scale reading corresponding to a temperature of 200°F.
1. 40°C
2. 94°C
3. 93°C
4. 30°C

Subtopic:  Introduction |
 69%
Level 2: 60%+
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Which of the following correctly represents 234,000 and 6.0012 in scientific notation?

1. \(2.34 \times 10^{-9} \text { and } 6 \times 10^3\)
2. \(0.234 \times 10^{-6} \text { and } 60012 \times 10^{-9}\)
3. \(2.34 \times 10^{-9} \text { and } 6.0012 \times 10^{-9}\)
4. \(2.34 \times 10^5 \text { and } 6.0012 \times 10^0\)
Subtopic:  Introduction |
 84%
Level 1: 80%+
Hints

Determine the number of significant figures in the final answer of the expression \(\large{\frac{(29.2-20.2)\times(1.79\times10^5)}{1.37}}\):

1. Two (2) 2. Four (4)
3. Six (6) 4.  Seven (7)
Subtopic:  Introduction |
 61%
Level 2: 60%+
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The number of significant figures in the numbers 5005, 500.0, and 126,000 are, respectively: 
1. 2, 4, and 3 
2. 4, 1, and 3 
3. 4, 4, and 6 
4. 4, 4, and 3 
Subtopic:  Introduction |
 60%
Level 2: 60%+
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If 0.5 mole of BaCl2 reacts with 0.2 mole of Na3PO4, what is the maximum number of moles of Ba₃(PO₄)₂ that can be formed?

1. 0.33 2. 0.25
3. 0.10 4. 0.52
Subtopic:  Limiting Reagent |
 74%
Level 2: 60%+
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