71
Na, Mg, Al, Si, P, S, Cl and Ar are related to . . . . . . . . period of modern periodic table.
A)
second
B)
fourth
C)
third
D)
first
Answer & Solution
Answer: Option
C
72
Newland considered that only . . . . . . . . elements were present in nature?
A)
46
B)
56
C)
64
D)
65
Answer & Solution
Answer: Option
B
73
What will be the electronic configuration of an element related to the second period and having strong chaining properties?
A)
2, 8, 4
B)
2, 6
C)
2, 4
D)
2, 8, 2
Answer & Solution
Answer: Option
C
74
Which of the following groups of atomic numbers are groups of alkaline metals?
A)
12, 20, 88, 56
B)
37, 19, 3, 55
C)
9, 17, 35, 53
D)
1, 3, 5, 45
Answer & Solution
Answer: Option
B
75
The atomic number of an element is 17. What is its place in the modern periodic table?
A)
Period 17 group 3
B)
Period 3 group 17
C)
Period 2 group 7
D)
Period 7 group 17
Answer & Solution
Answer: Option
B
76
Which of the following elements has the highest electronegativity?
A)
fluorine
B)
iodine
C)
chlorine
D)
bromine
Answer & Solution
Answer: Option
A
77
According to IUPAC, total number of groups and periods in the periodic table respectively are
A)
16, 9
B)
18, 7
C)
18, 9
D)
13, 7
Answer & Solution
Answer: Option
B
78
Which is the most reactive metal?
A)
Sodium
B)
Calcium
C)
Iron
D)
Potassium
Answer & Solution
Answer: Option
D
79
Ionization potential of nitrogen is . . . . . . . .
A)
more than oxygen
B)
half of oxygen
C)
same as oxygen
D)
less than oxygen
Answer & Solution
Answer: Option
A
80
Which of the following is not correct with reference to Neil Bohr's modern periodic table?
A)
The last element of every period has 8 valence electrons except helium, which consists of 2
B)
Elements of groups 3 to 12 are called transition elements
C)
Elements that have atomic numbers from 57 to 70 are called lanthanide series
D)
The element whose atomic number is 89 to 103 is called actinide serie
Answer & Solution
Answer: Option
C
