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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0.50 mol  Na2CO3 and 0.50 M Na2CO3 are different because:

 1 Both have different amounts of  Na2CO3. 2 0.50 mol is the number of moles and 0.50 M is the molarity. 3 0.50 mol  Na 2 CO 3  will generate more ions. 4 None of the above.

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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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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

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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. ${10}^{6}$ m d. Femto iv. ${10}^{9}$ 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. $2\mathrm{Mg}\left(\mathrm{s}\right)+{\mathrm{O}}_{2}\left(\mathrm{g}\right)\to 2\mathrm{MgO}\left(\mathrm{s}\right)$

2. ${\mathrm{C}}_{3}{\mathrm{H}}_{8}\left(\mathrm{g}\right)+{\mathrm{O}}_{2}\left(\mathrm{g}\right)\to {\mathrm{CO}}_{2}\left(\mathrm{g}\right)+{\mathrm{H}}_{2}\mathrm{O}\left(\mathrm{g}\right)$

3. ${\mathrm{P}}_{4}\left(\mathrm{s}\right)+5{\mathrm{O}}_{2}\left(\mathrm{g}\right)\to {\mathrm{P}}_{4}{\mathrm{O}}_{10}\left(\mathrm{s}\right)$

4. ${\mathrm{CH}}_{4}\left(\mathrm{g}\right)+2{\mathrm{O}}_{2}\left(\mathrm{g}\right)\to {\mathrm{CO}}_{2}\left(\mathrm{g}\right)+2{\mathrm{H}}_{2}\mathrm{O}\left(\mathrm{g}\right)$

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

1.

2. 0.234 $×{10}^{-6}$ and $60012×{10}^{-9}$

3.  $6.0012×{10}^{-9}$

4. 2.34$×{10}^{5}$ and 6.0012$×{10}^{0}$

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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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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 these.

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Which of the following statement indicates that the law of multiple proportions is being followed?

 1 A sample of carbon dioxide taken from any source will always have carbon and oxygen in the ratio of 1:2. 2 Carbon forms two oxides namely, CO2 and CO, where masses of oxygen that combine with a fixed mass of carbon are in the simple ratio of 2:1. 3 When magnesium burns in oxygen, the amount of magnesium used for the reaction is equal to the amount of magnesium  formed in magnesium oxide. 4 At constant temperature and pressure, 200 mL of hydrogen will combine with 100 mL of oxygen to produce 200 mL of water vapour.

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