Volume occupied by one molecule of water (density = 1 g cm-3 ) is
The maximum number of molecules are present in
15 L of H2 gas at STP
5 L of N2 gas at STP
0.5 g of H2 gas
10 g of O2 gas
In the reaction,When 1 mole of ammonia and 1 mole of O2 are made to react to completion, then
1.0 mole of H2O is produced
1.0 mole of NO will be produced
all the oxygen will be consumed
all the ammonia will be consumed
Which law states that, when two elements combine to form two or more compounds, then the different masses of one element, which combine with a fixed mass of the other element, bear a simple whole number ratio with one another ?
Law of conservation of mass
Law of definite composition
Law of constant composition
Law of multiple proportions
The number of moles of KMnO4 that will be needed to react with one mole of sulphite ion in acidic solution is
4/5
2/5
1
3/5
The species of an atom which possess different relative masses are called
Isotones
Isobars
Isotopes
Isoelectronic
Which law says that the matter is composed of discrete particles which do not break up during a chemical change?
Le chatlier Principles
Laws of chemical combination
Laws of conservation of mass
Huckel's law.
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%
An element , X has the following isotopic composition:The weighted average atomic mass of the naturally occurring element X is closest to
201 u
202 u
199 u
200 u
A metal oxide has the formula Z2 O3 . It can be reduced by hydrogen to give free metal and water. 0.1596g of the metal oxide requires 6 mg of hydrogen for complete reduction. The atomic weight of the metal is
27.9
159.6
79.8
55.8
