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 ${\mathrm{Na}}_{2}{\mathrm{CO}}_{3}$ and 0.50 M ${\mathrm{Na}}_{2}{\mathrm{CO}}_{3}$ are different because -

1. Both have different amounts of ${\mathrm{Na}}_{2}{\mathrm{CO}}_{3}$

2. 0.50 mol is the number of moles and 0.50 M is the molarity

3. 0.50 mol ${\mathrm{Na}}_{2}{\mathrm{CO}}_{3}$ 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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Which of the following reactions is not correct according to the law of conservation of mass?

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 g
2.
3.  4.7 g
4. 46.80 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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