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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Round up the following number into three significant figures:
i. 10.4107 ii. 0.04597 respectively are
1. | 10.4, 0.0460 | 2. | 10.41, 0.046 |
3. | 10.0, 0.04 | 4. | 10.4, 0.0467 |
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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 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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The numbers 234,000 and 6.0012 can be represented in scientific notation as -
1.
2. 0.234 and
3.
4. 2.34 and 6.0012
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List I | List II |
a. Micro | i. m |
b. Mega | ii. m |
c. Giga | iii. m |
d. Femto | iv. 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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Amount of HCl that would react with 5.0 g of manganese dioxide, as per the
given reaction will be:
4HCl(aq) + MnO2(s) ➡ 2H2O(l) + MnCl2(aq) + Cl2(2)
1. 4.8 g
2. 6.4 g
3. 2.8 g
4. 8.4 g
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The mass of CaCO3 required to react completely with 25 mL of 0.75 M HCl according to the given reaction would be:
CaCO3(s) + HCl(aq) ➡ CaCl2(aq) + CO2(g) + H2O(l)
1. 0.36 g
2. 0.09 g
3. 0.96 g
4. 0.66 g
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The molar mass of naturally occurring Argon isotopes is:
Isotope | Isotopic molar mass | Abundance |
36-Ar | 35.96755 g mol–1 | 0.337% |
38-Ar | 37.96272 g mol–1 | 0.063% |
40-Ar | 39.9624 g mol–1 | 99.600% |
1. | 49.99947 g mol-1 | 2. | 39.99947 g mol-1 |
3. | 35.59947 g mol-1 | 4. | 45.59947 g mol-1 |
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The number of significant figures present in the answer of the following calculations [(i), (ii), (iii)] are respectively -
1. | 0 . 02856 × 298 . 15 × 0 . 112 / 5785 |
2. | 5 × 5.364 |
3. | 0.0125 + 0.7864 + 0.0215 |
1. | 4, 4, 3 | 2. | 3, 3, 4 |
3. | 4, 3, 4 | 4. | 3, 4, 4 |
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