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Calculate the mass percentages of sodium (Na), sulfur (S), and oxygen (O), respectively, in sodium sulphate (Naâ‚‚SOâ‚„):

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 |
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If the mass of air per unit area at sea level is 1034 g cm–2, pressure in pascal will be:

1. 1.01332 × 105 Pa

2. 1.01332 × 106 Pa

3. 1.01332 × 107 Pa

4. 1.01332 × 108 Pa

Subtopic:  Introduction |
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The SI unit of mass is:

1. Kilogram (kg)

2. Gram (g)

3. Pascal (Pa)

4. Kilometres (km)

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The correct match is:
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 |
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A significant figure is defined as :

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 |
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The numbers 234,000 and 6.0012 can be represented in scientific notation as:
 

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 |
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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 |
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Level 3: 35%-60%
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Round up the following numbers into three significant figures: 
(i) 10.4107 
(ii) 0.04597

1. 10.4, 0.0460 2. 10.41, 0.046
3. 10.0, 0.04 4. 10.4, 0.0467
Subtopic:  Introduction |
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The following data was obtained when dinitrogen and dioxygen react together to form different compounds:

Mass of dinitrogen  Mass of dioxygen
i. 14 g 16 g
ii. 14 g 32 g
iii. 28 g 32 g
iv. 28 g 80 g

The law of chemical combination applicable to the above experimental data is:
1. Law of reciprocal proportions
2. Law of multiple proportions
3. Law of constant composition
4. None of the above.

Subtopic:  Introduction |
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If the speed of light is 3.0 × 108 m s–1, then the distance covered by light in 2.00 nanoseconds will be:

1. 0.500 m

2. 0.600 m

3. 0.700 m

4. 0.800 m

Subtopic:  Introduction |
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Level 1: 80%+
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