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Q. No.A mixture of and gas "Y" (mol. wt. 80) in the mole ratio a : b has a mean molecular weight of 40. What would be the mean molecular weight, if the gases are mixed in the ratio b : a under identical conditions? (assume that these gases do not react)
| 1. | 40 | 2. | 48 |
| 3. | 62 | 4. | 72 |
Subtopic: Â Moles, Atoms & Electrons |Â Equation Based Problem |
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The number of moles of hydrogen gas liberated when 39 g of potassium reacts with 7.8 g of water is:
1. 0.22 mol
2. 0.43 mol
3. 0.50 mol
4. 1.0 mol
1. 0.22 mol
2. 0.43 mol
3. 0.50 mol
4. 1.0 mol
Subtopic: Â Equation Based Problem |
From NCERT
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A sample of CaCO3 is 50% pure. On heating 1.12 litres of CO2 (at STP) is obtained. The weight of residues left (assuming non-volatile impurity) is:
(Ca = 40, C= 12, O=16)
| 1. | 7.8 g | 2. | 5 g |
| 3. | 3.8 g | 4. | 2.8 g |
Subtopic: Â Equation Based Problem |
From NCERT
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NEET 2026 - Target Batch - Vital
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NEET 2026 - Target Batch - Vital
A 1.00 g sample of which compound will produce the greatest amount of carbon dioxide after complete combustion with excess oxygen?
1. CH4
2. C3H8
3. C6H6
4. C8H18
1. CH4
2. C3H8
3. C6H6
4. C8H18
Subtopic: Â Equation Based Problem |
From NCERT
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9.8 gm \(KClO_3 \) is decomposed and the weight loss was observed to be 0.384 gm. The percentage of \(KClO_3\) decomposed is:
1. 10%
2. 20%
3. 40%
4. 100%
1. 10%
2. 20%
3. 40%
4. 100%
Subtopic: Â Equation Based Problem |
From NCERT
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