A compound is formed by substitution of two chlorine for two hydrogens in propane. The number of possible isomeric compounds is
4
3
2
5
Which one of the following formulae does not represent an organic compound ?
C4H10O4
C4H6O4
C4H7ClO4
C4H9O4
The following graph shows how t1/2 (half-life) of a reactant, R changes with the initial reactant concentration a0. The order of the reaction will be
0
1
2
3
The time taken for 10% completion of a first order reaction is 20 min. Then, for 19% completion, the reaction will take
40 min
60 min
30 min
50 min
The half-life of a radioactive element is 10 h. How much will be left after 4 h in 1 g atom sample?
45.6 x 1023 atom
4.56 x 1023 atom
4.56 x 1021 atom
4.56 1020 atom
B.
4.56 x 1023 atom
Of the following acids the one which has the capability to form complex compound and also possesses oxidising and reducing properties is
HNO3
HNO2
HCOOH
HCN
Atoms in a P4 molecule of white phosphorus are arranged regularly in the following way
at the corners of a cube
at the corners of an octahedron
at the corners of a tetrahedron
at the centre and corners of a tetrahedron