What volume of oxygen gas (O2) measured at and 1 atm, is needed to burn completely 1L of propane gas (C3H8) measured under the same conditions?
1. 7L
2. 6L
3. 5L
4. 10L
1 g of magnesium is burnt with 0.56g of oxygen in a closed vessel. The left-out reactant and its quantity are
(At. weight of Mg = 24, O=16)
1. | Mg, 0.16g | 2. | O2, 0.16g |
3. | Mg, 0.44g | 4. | O2, 0.28g |
Percentage of Se in peroxidase anhydrase enzyme is 0.5% by weight (at. weight = 78.4), then minimum molecular weight of peroxidase anhydrase enzyme is
1. 1.568 x 103
2. 15.68
3. 2.168 x 104
4. 1.568 x 104
Number of moles of Mn required to oxidise one mole of ferrous oxalate completely in acidic medium will be
1. 0.6 mole
2. 0.4 mole
3. 7.5 moles
4. 0.2 mole
Assuming fully decomposed, the volume of CO2 released at STP on heating 9.85g of BaCO3 [at. mass of Ba = 137] will be
1. 1.12L
2. 0.84L
3. 2.24L
4. 4.96L
The total number of valence electrons in 4.2g of ion is (NA is the Avogadro's number)
1. 2.1NA
2. 4.2NA
3. 1.6NA
4. 3.2NA
When 22.4L of H2(g) is mixed with 11.2L of Cl2(g) each at STP, the moles of HCl(g) formed is equal to
1. 1 mole of HCl(g)
2. 2 moles of HCl(g)
3. 0.5 mole of HCl(g)
4. 1.5 moles of HCl(g)
The mass of carbon anode consumed (giving only carbon dioxide) in the production of 270 kg of aluminium metal from bauxite by the Hall process is (at. mass of Al = 27)
1. 180 kg
2. 270 kg
3. 540 kg
4. 90 kg
In the Haber process, 30 L of dihydrogen and 30 L of dinitrogen were taken for the reaction, which yielded only 50% of the expected product. The composition of the gaseous mixture under the said conditions in the end is:
1. 20 L ammonia, 10 L nitrogen, 30 L hydrogen
2. 20 L ammonia, 25 L nitrogen, 15 L hydrogen
3. 20 L ammonia, 20 L nitrogen, 20 L hydrogen
4. 10 L ammonia, 25 L nitrogen, 15 L hydrogen
The number of atoms in 4.25 g of NH3 is approximately
1. 4 x 1023
2. 2 x 1023
3. 1 x 1023
4. 6 x 1023