Match the column-I with column-II.
Column-I Column-II
(a) Dobereiner (i) Initial development of periodic table and main contribution of
classification
(b) John (ii) Arranged elements in group of
Newland three triad-formation
(c) Dmitri (iii) Law of octaves, arranged elements in increasing order
Mendeleev of atomic mass
(iv) Atomic number is a more fundamental property than its
atomic mass.
Answers
Answered by
0
Answer:
Q1
Assertion (A): Though the central atom of both NH
3
and H
2
O molecules are sp
3
C hybridized,
yet H-N-H bond angle is greater than that of H-O-H.
Reason (R): This is because nitrogen atom has a lone pair and oxygen atom has two lone pairs.
Q2
Give reasons in one or two sentences for the following:
p-Dichlorobenzene has a higher melting point than o- and m-isomers but the boiling points of these isomers are nearly the same.
Q3
Give reasons for the following:
(a) Oxygen has lower ionisation energy than that of nitrogen.
(b) Electron gain enthalpy of chlorine is more negative than that of fluorine.
(c) Arrange O
2−
, Al
3+
, Na
+
,F
−
and Mg
2+
in the increasing order of their sizes.
Answered by
0
Answer:
a-2 b-3 c-1
Explanation:
aur nahi pata aap karo
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