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Q. No.

Calculate the mass percentages of sodium (Na), sulfur (S), and oxygen (O), respectively, in sodium sulphate (Na₂SO₄):

1. 32.4%, 45.05% and 22.6%

2. 22.6%, 45.05% and 32.4%

3. 32.4%, 22.6% and 45.05%

4. 45.05%, 32.4% and 22.6%

Subtopic:  Introduction |
 76%
Level 2: 60%+
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If the mass of air above a unit area at sea level is 1034 g cm⁻², what is the corresponding atmospheric pressure in pascal?

1. 1.01332 × 105 Pa

2. 1.01332 × 106 Pa

3. 1.01332 × 107 Pa

4. 1.01332 × 108 Pa

Subtopic:  Introduction |
 67%
Level 2: 60%+
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Which of the following is the SI unit of mass?

1. Kilogram (kg)

2. Gram (g)

3. Pascal (Pa)

4. Kilometres (km)

Subtopic:  Introduction |
 88%
Level 1: 80%+
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Which of the following correctly defines significant figures ?

1. The total number of digits in a number, including the last digit that represents the uncertainty of the result. 
2. The total number of digits in a number, excluding the last digit, which represents the uncertainty of the result.
3. The total number of digits in a number including the last digit that represents the certainty of the result. 
4. The total number of last digits that represents the uncertainty of the result. 

Subtopic:  Introduction |
 51%
Level 3: 35%-60%
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Find the value of 15.15 pm expressed in the basic SI unit of length.

1. 1.515 × 10–12 

2. 2.57 × 10–11 m

3. 2.87 × 10–11 m

4. 1.515 × 10–11 m

Subtopic:  Introduction |
 77%
Level 2: 60%+
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Determine the number of significant figures that should be present in the final answers for each of the following expressions:

I. 0.02856 × 298.15 × 0.112 / 5785
II. 5 × 5.364
III. 0.0125 + 0.7864 + 0.0215
 
1. 4, 4, 3 2. 3, 3, 4
3. 4, 3, 4 4. 3, 4, 4

Subtopic:  Introduction |
 62%
Level 2: 60%+
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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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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%+
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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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What is the difference between 0.50 mol Na₂CO₃ and 0.50 M Na₂CO₃?

1. They represent different amounts of Na₂CO₃.
2. 0.50 mol represents the amount of Na₂CO₃, whereas 0.50 M represents its molarity.
3. 0.50 mol Na₂CO₃ produces more ions.
4. None of the above.

Subtopic:  Introduction |
 89%
Level 1: 80%+
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