The percentage weight of Zn in white vitriol [ZnSO4 . 7 H2O] is approximately equal to (Zn = 65, S = 32, O = 16 and H = 1 )
33.65%
32.56%
23.65%
22.65%
Specific volume of cylindrical virus particle is , whose radius and length are respectively. If , find molecular weight of virus.
15.4 kg/mol
The number of significant figures for the three numbers 161 cm, 0.161 cm, 0.0161 cm are
3,4 and 5 respectively
3,4 and 4 respectively
3,3 and 4 respectively
3,3 and 3 respectively
The number of moles of oxygen in 1 L of air containing 21 % oxygen by volume, under standard conditions, is
0.0093 mole
2.10 moles
0.186 mole
0.21 mole
Matter is made up of extremely small discrete particles called
Atoms
Molecules
Elements
Ions
The number of moles of KMnO4 reduced by one mole of KI in alkaline medium is
one fifth
five
one
two
Certain species of atoms of different elements having identical relative masses are called
isotones
isobars
isotopes
isoelectronic
Volume occupied by one molecule of water (density = 1 g cm-3 ) is
0.24 g of a volatile gas, upon vaporisation, gives 45 mL vapour at NTP. What will be the vapour density of the substance?(Density of H2 = 0.089)
95.93
59.93
95.39
5.993
Haemoglobin contains 0.33% of iron by weight. The molecular weight of haemoglobin is approximately 67200. The number of iron atoms (atomic weight of Fe is 56) present in one molecule of haemoglobin are
1
6
4
2
