1
Zinc ore (zinc sulphide) is treated with sulphuric acid, leaving a solution with some undissolved bi ...
2
Some bottles of colourless liquids were being labelled when the technicians accidentally mixed them ...
3
A sample of hydrogen gas is collected and it is observed that it contains only hydrogen and deuteriu ...
4
The shape of tobacco mosaic virus (TMV) is cylindrical, having length 3000 Å and diameter 170 Å. If ...
5
From 2 mg calcium, 1.2 × 10^19 atoms are removed. The number of g-atoms of calcium left is (Ca = 40) ...
6
At room temperature, the molar volume of hydrogen fluoride gas has a mass of about 50 g. The formula ...
7
‘n’ mol of N2 and 0.05 mol of Ar are enclosed in a vessel of capacity 6 l at 1 atm and 27°C. The val ...
8
A gaseous mixture contains 40% H2 and 60% He, by volume. What is the total number of moles of gases ...
9
A polystyrene of formula Br3C6H2(C8H8)n was prepared by heating styrene with tribromobenzyl peroxide ...
10
In Dumas method, 0.2 g of an organic nitrogenous compound gave 28 ml of N2 (volume reduced to 0°C an ...
11
A compound contains elements X and Y in 1:4 mass ratio. If the atomic masses of X and Y are in 1:2 r ...
12
When a certain amount of octane, C8H18, is burnt completely, 7.04 g CO2 is formed. What is the mass ...
13
A mixture of N2 and H2 is caused to react in a closed container to form NH3. The reaction ceases bef ...
14
A power company burns approximately 500 tons of coal per day to produce electricity. If the sulphur ...
15
Hydrogen cyanide, HCN, is prepared from ammonia, air and natural gas (CH4) by the following process. ...
16
One mole of a mixture of CO and CO2 requires exactly 20 g of NaOH in solution for complete conversio ...
17
When 0.03 l of a mixture of hydrogen and oxygen was exploded, 0.003 l of oxygen remained. The initia ...
18
A volume of 10 ml hydrogen requires 25 ml air for complete combustion. The volume per cent of N2 in ...
19
A volume of 10 ml chlorine gas combines with 25 ml of oxygen gas to form 10 ml of a gaseous compound ...
20
How many grams of solute should be added in 100 g water to get a solution of density 1.2 g/ml and st ...
21
How much BaCl2 would be needed to make 250 ml of a solution having the same concentration of Cl⁻ as ...
22
A quantity of 2.76 g of silver carbonate on being strongly heated yields a residue weighing (Ag = 10 ...
23
A mixture of 254 g of iodine and 142 g of chlorine is made to react completely to give a mixture of ...
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A quantity of 4.35 g of a sample of pyrolusite ore, when heated with conc. HCl, gave chlorine. The c ...
25
A 1.50 g sample of potassium bicarbonate having 80% purity is strongly heated. Assuming the impurity ...
26
When burnt in air, 14.0 g mixture of carbon and sulphur gives a mixture of CO2 and SO2 in the volume ...
27
A volume V of a gaseous hydrocarbon was exploded with an excess of oxygen. The observed contraction ...
28
The percentage by volume of C3H8 in a mixture of C3H8, CH4 and CO is 36.5. The volume of CO2 produce ...
29
If isotopic distribution of C12 and C14 is 98.0% and 2.0%, respectively, then the number of C14 atom ...
30
How many atoms do mercury vapour molecules consist of if the density of mercury vapour relative to a ...
31
If an iodized salt contains 1% of KI and a person takes 2 g of the salt every day, the iodine ions g ...
32
Ethanol is the substance commonly called alcohol. The density of liquid alcohol is 0.8 g/ml at 293 K ...
33
Most abundant element dissolved in sea water is chlorine at a concentration of 19 g/kg of sea water. ...
34
The commonly used pain reliever, aspirin, has the molecular formula C9H8O4. If a sample of aspirin c ...
35
A quantity of 0.2 g of an organic compound containing C, H, and O, on combustion yielded 0.147 g CO2 ...
36
What mass of carbon disulphide, CS2 can be completely oxidized to SO2 and CO2 by the oxygen liberate ...
37
Mole fraction of solute in an aqueous solution of NaOH is 0.1. If the specific gravity of the soluti ...
38
The mass of 3.2 × 10^5 atoms of an element is 8.0 × 10^−18 g. The atomic mass of the element is abou ...
39
The fractional abundance of Cl35 in a sample of chlorine containing only Cl35 (atomic weight = 34.9) ...
40
While resting, the average 70 kg human male consumes 16.628 l of oxygen per hour at 27°C and 100 kPa ...
41
A given mixture consists only of pure substance X and pure substance Y. The total mass of the mixtur ...
42
A gaseous mixture contains 70% N2 and 30% unknown gas, by volume. If the average molecular mass of t ...
43
The empirical formula of an organic gaseous compound containing carbon and hydrogen is CH2. The volu ...
44
An organic compound contains 40% carbon and 6.67% hydrogen by mass. Which of the following represent ...
45
A compound contains equal masses of the elements A, B and C. If the atomic masses of A, B and C are ...
46
If rocket were fuelled with kerosene and liquid oxygen, what mass of oxygen would be required for ev ...
47
When 20 g Fe2O3 is reacted with 50 g of HCl, FeCl3 and H2O are formed. The amount of unreacted HCl i ...
48
An amount of 1.0 × 10^–3 moles of Ag+ and 1.0 × 10^–3 moles of CrO4^2- react together to form solid ...
49
A mixture of methane and ethylene in the ratio of a:b by volume occupies 30 ml. On complete combusti ...
50
A volume of 200 ml of oxygen is added to 100 ml of a mixture containing CS2 vapour and CO, and the t ...
51
The legal limit for human exposure to CO in the workplace is 35 ppm. Assuming that the density of ai ...
52
The concentration of the same aqueous solution of glucose is determined by two students—Sawan and Ga ...
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D5W refers to one of the solutions used as an intravenous fluid. It is a 5% by mass solution of dext ...
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