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 at 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
What is the approximate number of atoms present in 4.25 grams of NH3?
1. 4 x 1023
2. 2 x 1023
3. 1 x 1023
4. 6 x 1023
In the reaction, 4NH3(g)+ 5O2(g) 4NO(g) +6H2O(l)
When 1 mole of ammonia and 1 mole of O2 reacts to completion, then:
1. | 1.0 mole of H2O is produced. |
2. | 1.0 mole of NO will be produced. |
3. | All the oxygen will be consumed. |
4. | All the ammonia will be consumed. |
An element X has the following isotopic composition,
200X : 90%, 199X : 8.0%, 202X : 2.0%
The weighted average atomic mass of the naturally occurring element X is closest to:
1. | 205 u | 2. | 220 u |
3. | 196 u | 4. | 200 u |
Upon vaporization, 0.24g of a volatile gas gives 45 mL vapour at NTP. What will be the vapour density of the substance?
(Density of Hydrogen at STP: 0.08988 g/L)
1. 95.93
2. 59.93
3. 95.39
4. 5.993
The hydrated salt, Na2SO4.nH2O, undergoes a 55% loss in mass on heating and becomes anhydrous. The value of n will be:
1. | 5 | 2. | 3 |
3. | 7 | 4. | 10 |
12 g of Mg (atomic mass = 24) will react completely with an acid to yield:
1. One mole of H2
2. A half mole of H2
3. One mole of O2
4. None of the above
The molality of a 15% (w/vol.) solution of H2SO4 of density 1.1g/cm3 is-
1. 1.2
2. 1.4
3. 1.8
4. 1.6
H3PO4 is a tribasic acid and one of its salts is NaH2PO4. What volume of 1 M NaOH should be added to 12g NaH2PO4 (Molar mass 120) to exactly convert it into Na3PO4?
1. 100 mL
2. 300mL
3. 200mL
4. 80mL