Mass of sucrose C12H22O11 produced by mixing 84 gm of carbon, 12gm of hydrogen and 56L. O2 at 1atm & 273 K according to give reaction, is C(s) + H2(g) +O2(g) C12H22O11 (s)
1. 138.5
2. 155.5
3. 172.5
4. 199.4
A mixture contains Na2CO3 and NaHCO3 and wt. of mixture is 10gm. Mixture on heating liberates 56ml of CO2 at S.T.P, wt of Na2CO3 in mixture is
1. 9.58 gm
2. 5 gm
3. 7.5 gm
4. 8 gm
How many moles of KMnO4 are needed to oxidize a mixture of 1 mole of each FeSO4 & FeC2O4 in acidic medium
1.
2.
3.
4.
1.0 mol of Fe reacts completely with 0.65 mol of O2 to give a mixture of only FeO and Fe2O3. The mole ratio of ferrous oxide to ferric oxide is
(1) 2 : 2
(2) 4 : 3
(3) 1 : 2
(4) 2 : 7
The percentage of copper in a copper(II) salt can be determined by using a thiosulphate titration. 0.305 gm of a copper(II) salt was dissolved in water and added to, an excess of potassium iodide solution liberating iodine according to the following equation 2Cu2 (aq) + 4I– (aq) 2CuI(s) + I2(aq) The iodine liberated required 24.5cm3 of a 0.100 mole dm-3 solution of sodium thiosulphate 2S2O32- (aq) + I2(aq) 2I– (aq) + S4O62- (aq) the percentage of copper, by mass in the copper(ll) salt is. [Atomic mass of copper = 63.5]
1. 64.2
2. 51.0
3 48.4
4. 25.5
Oxygen contains 90% O16 and 10% O18. Its atomic mass is
(1) 17.4
(2) 16.2
(3) 16.5
(4) 17
The total number of electrons present in 1.6 gm. of methane is [IIT 1976; Roorkee 1985; CPMT 1987, 92]
(1) 6.02 × 1023
(2) 6.02 × 1022
(3) 6.02 × 1021
(4) 4.02 × 1020
KClO3 on heating decomposes to KCl and O2. The volume of O2 at STP liberated by 0.1 mole KClO3 is
1. 4.36 L
2. 3.36 L
3. 2.36 L
4. None of these
At S.T.P. the density of CCl4 vapour in g/L will be nearest to [CBSE PMT 1988]
(1) 6.84
(2) 3.42
(3) 10.26
(4) 4.57
4.4 g of an unknown gas occupies 2.24 litres of volume at NTP. The gas may be:
1. | Carbon dioxide | 2. | Carbon monoxide |
3. | Oxygen | 4. | Sulphur dioxide |