Match the following physical quantities with units.

Physical quantity Unit
A. Molarity 1. mol kg-1 
B. Molality 2. mol L-1
C. Pressure 3. Candela
D. Luminous intensity 4. Pascal

Codes

A B C D
1. 1 4 2 3
2. 2 1 4 3
3. 1 4 3 2
4. 4 1 3 2
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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
 
a b c d
1. i iv iii ii
2. iii iv ii i
3. ii iii iv i
4. i iii iv ii
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Identify the reaction that does not obey the law of conservation of mass from the provided options.
 

1. 2Mg(s)+O2(g)2MgO(s)

2. C3H8(g)+O2(g)CO2(g)+H2O(g)

3. P4(s)+5O2(g)P4O10(s)

4. CH4(g)+2O2(g)CO2(g)+2H2O(g)

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

1. 2.34×10-9 and 6×103

2. 0.234 ×10-6 and 60012×10-9

3. 2.34×10-9 and 6.0012×10-9

4. 2.34×105 and 6.0012×100

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If the density of the solution is 3.12 g ml-1, then what will be the mass of the 1.5 ml solution in two significant figures?

1. \(4.4~\mathrm{g}\) 2. \(4680 \times 10^{3} ~\mathrm{g}\)
3. \(4.7~\mathrm{g}\) 4. \(46.80~\mathrm{g}\)
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In sodium sulphate (Na2SO4), the mass percent of sodium, sulfur and oxygen is:

1. 32.4%, 45.05%, 22.6%

2. 22.6%, 45.05%, 32.4%

3. 32.4%, 22.6%, 45.05%

4. 45.05%, 32.4%, 22.6%

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Two students performed the same experiment separately, and each of them recorded two readings of mass, which are given below. The correct reading of mass is 3.0 g. On the basis of the given data, mark the correct option out of the following statements.

Students Readings
(i) (ii)
    A 3.01 2.99
    B 3.05 2.95

1. The results of both the students' are neither accurate nor precise.
2. The results of student A are both precise and accurate.
3. Student B's results are neither precise nor accurate.
4. The results of student B are both precise and accurate.

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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 
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