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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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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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 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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If 10 volumes of H2 gas react with 5 volumes of O2 gas, the volumes of water vapor produced would be:
1. 9
2. 8
3. 10
4. 11
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In a reaction A + B2 →AB2,
A will act as a limiting reagent if :
i. | 300 atoms of A reacts with 200 molecules of B |
ii. | 2 moles A reacts with 3 moles B2 |
iii. | 100 atoms of A reacts with 100 molecules of B |
iv. | 5 moles A reacts with 2.5 moles B |
v. | 2.5 moles A reacts with 5 moles B2 |
Choose the correct option:
1. | (i), (ii) |
2. | (i), (ii), (v) |
3. | (ii), (v) |
4. | All |
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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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Assertion (A): | When 4 moles of H2 reacts with 2 moles of O2, then 4 moles of water are formed. |
Reason (R): | O2 will act as a limiting reagent. |
1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
3. | (A) is true but (R) is false. |
4. | Both (A) and (R) are false. |
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Assertion (A): | The number of molecules in 2 moles of NH3 is equal to the number of molecules in 4 moles of CH4. |
Reason (R): | Both are chemically similar species. |
1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
3. | (A) is true but (R) is false. |
4. | Both (A) and (R) are false. |
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