The equation used to represents the electron gain enthalpy is
X(g) + e- → X-(g)
X(s) + e- → X-(g)
X(g) → X+(g) + e-
X(s) → X+(g) + e-
An element in +2 oxidation state has 24 electrons. The atomic number of the element and the number of unpaired electrons in it respectively are
24 and 4
26 and 4
24 and 2
26 and 5
Number of bonding electron pairs and number of lone pairs of electrons in ClF3, SF4, BrF5 respectively are
3, 2, 4, 2, 5, 2
3, 1, 4, 1,5, 2
3, 1, 4, 2, 5, 1
3, 2, 4, 1, 5, 1
Match the following
List I | List II |
(A) Viscosity | (I) Critical temperature |
(B) Ideal gas behaviour | (II) Isobar |
(C) Liquefaction of gases | (III) Compressibility factor |
(D) Charles'law | (IV) kg s-2 |
(V) kgm-1s-1 |
The correct answer
A-IV, B-III, C-I, D-II
A-V, B-III, C-I, D-II
A-V, B-III, C-II, D-I
A-IV, B-III, C-II, D-I
Acccording to significant figure convention the result obtained by adding 12.11, 18.0 and 1.012 is
31.12
31.1
31
31.122
B.
31.1
According to significants figure convention, during adding the number of decimal places in the answer should not exceed the number of decimal places in either the numbers
18.0 has only one digit aftyer the decimal point, thus the result should be reported only upto one digit after the decimal point which is 31.1.