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Q. No.0.5 grams of a compound contains 0.2 grams of KOH. The percentage weight of potassium in that
compound is:
1. 80
2. 60
3. 40
4. 28
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A smuggler travelling from Dubai on a not-so-reputed airline was found in possession of 19.7 kg of gold. How many atoms of gold were recovered? (Atomic mass of gold (Au) is 197 u)
1. 6.02 × 1022
2. 6.02 × 1023
3. 6.02 × 1024
4. 6.02 × 1025
1. 6.02 × 1022
2. 6.02 × 1023
3. 6.02 × 1024
4. 6.02 × 1025
Subtopic: Moles, Atoms & Electrons |
65%
From NCERT
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If two moles of methanol (\(CH_3OH\)) completely burn to carbon dioxide and water, the weight of water formed is about:
1. 22 g
2. 18 g
3. 36 g
4. 72 g
1. 22 g
2. 18 g
3. 36 g
4. 72 g
Subtopic: Equation Based Problem |
71%
From NCERT
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Calculate the amount of Ni required by the Mond's process.
Ni + 4CO → Ni(CO)4
If the CO used in this process is obtained through a process in which 6 g of carbon reacts with 44 g CO2? (Ni - 58.7)
1. 14.675 g
2. 29 g
3. 58 g
4. 28 g
Ni + 4CO → Ni(CO)4
If the CO used in this process is obtained through a process in which 6 g of carbon reacts with 44 g CO2? (Ni - 58.7)
1. 14.675 g
2. 29 g
3. 58 g
4. 28 g
Subtopic: Equation Based Problem |
70%
From NCERT
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The elements A (atomic weight = 75) and B (atomic weight = 32) combine to form a compound X. If 3 moles of B combine with 2 moles of A to produce 1 mole of X, the weight of 5 moles of X will be:
1. 246 gm
2. 1230 amu
3. 1.23 kg
4. None of the above
1. 246 gm
2. 1230 amu
3. 1.23 kg
4. None of the above
Subtopic: Limiting Reagent |
51%
From NCERT
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20 ml of nitric oxide combines with 10 ml of oxygen at STP to give NO2. The final volume will be:
1. 30 ml
2. 20 ml
3. 10 ml
4. 40 ml
1. 30 ml
2. 20 ml
3. 10 ml
4. 40 ml
Subtopic: Limiting Reagent |
62%
From NCERT
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The following reaction is given for reference:
\(2 \mathrm{KI}+\mathrm{HgI}_2 \rightarrow \mathrm{K}_2 \mathrm{HgI}_4\)
The number of moles of KI required to produce 0.4 moles of K2HgI4 is:
1. 0.4
2. 0.8
3. 3.2
4. 1.6
\(2 \mathrm{KI}+\mathrm{HgI}_2 \rightarrow \mathrm{K}_2 \mathrm{HgI}_4\)
The number of moles of KI required to produce 0.4 moles of K2HgI4 is:
1. 0.4
2. 0.8
3. 3.2
4. 1.6
Subtopic: Equation Based Problem |
90%
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If compound A contains 92.3 % C and 7.7 % H, then the empirical formula of the compound 'A' will be:
1. C6H6
2. CH
3. C3H6
4. CH2
1. C6H6
2. CH
3. C3H6
4. CH2
Subtopic: Empirical & Molecular Formula |
79%
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The number of moles of H2 in 0.224 litre of hydrogen gas at STP is:
1. 1
2. 0.1
3. 0.01
4. 0.001
1. 1
2. 0.1
3. 0.01
4. 0.001
Subtopic: Moles, Atoms & Electrons |
86%
From NCERT
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Consider the given two statements:
Select the correct option:
| Statement I: | The law of multiple proportions is followed by the gases SO2 and SO3, but not by CO and CO2. |
| Statement II: | Dalton’s theory explains the laws of chemical combination as well as laws of gaseous volumes. |
| 1. | Statement I is correct, and Statement II is correct. |
| 2. | Statement I is incorrect, and Statement II is correct. |
| 3. | Statement I is correct, and Statement II is incorrect. |
| 4. | Statement I is incorrect, and Statement II is incorrect. |
Subtopic: Introduction |
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