| 1 |
Cadmium has isotopes. |
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| 2 |
Nickel has isotopes |
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| 3 |
Actual yield is mostly less than the theoretical yield due to the reason that |
- A. Rates of reactions are slow
- B. Loss of the product during handling
- C. Reactions are never completed 100%
- D. Law of conservation of mass is not true
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| 4 |
What has a mass equal to that of one mole of water. |
- A. 22.4 dm3 of water
- B. One mole of steam
- C. One molecule of water
- D. Two moles of hydrogen molecules and one mole of oxygen molecules.
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| 5 |
I molar volume of a gas at S.T.P is occupied by |
- A. 1 g of gas
- B. 6 x 10<sup>23</sup>g of gas
- C. 22.4 m<sup>3</sup>of gas
- D. 1 gram molecular mass of gas
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| 6 |
A limiting reactant is that one which |
- A. Gives greatest number of moles of products
- B. Gives least number of moles of products
- C. Is left behind after the completion of reaction
- D. Is mostly a cheaper substance as compared to other reactants
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| 7 |
How many atoms are present in half mol of oxygen gas. Gas exist in diatomic state. |
- A. 3.01 x 10<sup>23</sup>
- B. 6.02 x 10<sup>23</sup>
- C. 2 x 10<sup>23</sup>
- D. 1.003 x 10<sup>23</sup>
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| 8 |
One mole of SO2 contains |
- A. 6.02 x 10<sup>23</sup>atoms of oxygen
- B. 18.1 x 10<sup>23</sup>atoms of SO2
- C. 6.02 x 10<sup>23</sup>atoms of Sulphur
- D. 4 g atoms of SO2
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| 9 |
The Avogadro constant is the number of. |
- A. Atoms in 1 g of helium ga
- B. Molecules in 35.5 g of chlorine gas
- C. Atoms in 6 h graphite
- D. Atoms in 24 g of magnesium
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| 10 |
Many elements have fractional atomic masses. This is because |
- A. The mass of the atom is itself fractional
- B. Atomic masses are average masses of isobars
- C. Atomic masses are average masses of isotopes
- D. Atomic masses are average masses of isotopes proportional to their relative abundance
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