d- and f- Block Elements  MCQs

MCQs of d- and f- Block Elements

Showing 91 to 100 out of 158 Questions
7 8 9 10 11 12
91.
Which of the following alloys is used to make pendulums in clocks ?
(a) Invar
(b) Nichrome
(c) Nitinol
(d) German silver
Answer:

Option (a)

92.
Which of the following ions has the same value of magnetic moment as Co3+ has ?
(a) Fe3+
(b) Cr3+
(c) Cr2+
(d) Cr4+
Answer:

Option (c)

93.
Percentage proportion in 18 carat gold is _____ .
(a) 18 %
(b) 24 %
(c) 75 %
(d) 60 %
Answer:

Option (c)

94.
State the percentage proportion of component metals in the alloy which possesses wonderful property of memory.
(a) 45 % Ti and 55 % Ni
(b) 8 % Ni, 18 % Cr and remaining Fe
(c) 67 % to 70 % Ni, remaining Cu
(d) 60 % Ni and 40 % Cr
Answer:

Option (a)

95.
An alloy of which of the following metals is used in filling the cavity in the tooth ?
(a) Hg, Ag, Sn. Cu, Zn
(b) Hg, Au, Sn, Cu, Ni
(c) Hg, Al, Sn, Cu, Zn
(d) Hg, Ag, Sn, Cu, Ni
Answer:

Option (d)

96.
Which of the following mixtures of metals cannot form alloy ?
(a) Fe + Cr + Cu
(b) Ni + Cu + Cr
(c) Ni + Mg + Cr
(d) Au + Cu + Cr
Answer:

Option (c)

97.
Which of the following oxides of chromium is amphoteric ?
(a) Cr2O3
(b) CrO
(c) CrO3
(d) CrO5
Answer:

Option (a)

98.
Which stable inert oxide layer is formed on the surface of chromium ?
(a) CrO2
(b) CrO3
(c) Cr2O3
(d) CrO
Answer:

Option (c)

99.
To what is MnO4- reduced when pH > 7 ?
(a) MnO2
(b) Mn2O3
(c) Mn2O7
(d) MnO
Answer:

Option (a)

100.
Select the use of potassium dichromate.
(a) As an oxidant to convert ferrous ion into ferric ion in acidic medium.
(b) As an insecticide
(c) In electroplanting
(d) As s reductant
Answer:

Option (a)

Showing 91 to 100 out of 158 Questions
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