The mass of carbon present in 0.5 mole of K4[Fe(CN)6] is:
1. | 1.8 g | 2. | 18 g |
3. | 3.6 g | 4. | 36 g |
Assertion (A): | In Haber's process, starting with 5 moles of N2 and 2.5 mol of H2, on complete reaction only 1.66 moles of NH3 were produced. |
Reason (R): | H2 acts as a limiting reagent in this reaction. |
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. |
Assertion (A): | 1 g O2 and 1 g O3 have an equal number of oxygen atoms. |
Reason (R): | O2 and O3 have different molar masses. |
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. | (A) is False but (R) is True. |
ln, a closed vessel, 50 ml of completely reacts with 200 ml of C2 according to the following equation:
The composition of the gaseous mixture in the system will be:
1. 100 ml
2. 25 ml
3. 75 ml
4. 10 ml
The density of a 2 M aqueous solution of NaOH is 1.28 g/. The molality of the solution is:
[molecular mass of NaOH = 40 ]
1. | 1.20 m | 2. | 1.56 m |
3. | 1.67 m | 4. | 1.32 m |
On complete combustion, 44 g of a sample of a compound gives 88 g CO2 and 36 g of H2O. The molecular formula of the compound may be:
1.
2.
3.
4.
The molality of pure water is:
1. 1 m
2. 18 m
3. 55.5 m
4. None of the above
The maximum number of molecules is present in which of the following?
1. 15 L of gas at STP
2. 5 L of gas at STP
3. 0.5 g of gas
4. 10 g of gas
The number of moles present in 2.5 litres of 0.2 M are:
1. 0.25
2. 0.5
3. 0.75
4. 0.2
Which of the following statements is correct?
1. 1 mole of electrons weights 5.4 mg .
2. 1 mole of electrons weights 5.4 kg.
3. 1 mole of electrons weights 0.54 mg.
4. 1 mole of electrons has 1.6 C of charge.