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
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.
3.
The maximum number of atoms is present in which of the following -
1. 1 g of Mg(s)
2. 1 g of O2 (g)
3. 1 g of Li(s)
4. 1 g of Ag(s)
The same number of molecules as 16 g of dioxygen is present in -
(1) 16 g O
(2) 16 g SO
(3) 32 g SO
(4) All of above
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
Which of the following is the odd one with regard to mass?
1. 1 g atom of sulphur
2. 0.5 moles of CO
3. 1 mole of O
4. 3 × 10 23 molecules of SO
The weight of one molecule of a compound C60H122 is
1.
2.
3.
4.
Breakfast cereal is advertised to contain 110 mg of sodium/ 100 grams of cereal. The percent of sodium in the cereal is
(1) 0.110%
(2) 0.0110 %
(3) 11.0%
(4) 0.22 %
The percentage weight of Zn in white vitriol [ZnSO4.7H2O] is approximately equal to (Zn=65, S=32, O=16 and H=1)
1. 21.56%
2. 32.58%
3. 22.65%
4. 26.55%