d- and f- Block Elements  MCQs

MCQs of d- and f- Block Elements

Showing 141 to 150 out of 158 Questions
11 12 13 14 15 16
141.
Which of the following alloys is useful in riveting work ?
(a) Cupronickel
(b) Nichrome
(c) Nitinol
(d) German silver
Answer:

Option (c)

142.
What is the colour of crystals of potassium dichromate ?
(a) Orange
(b) Yellow
(c) Blue
(d) Green
Answer:

Option (a)

143.
Which of the following compounds is useful in leather industry ?
(a) K2CrO4
(b) K2Cr2O7
(c) KMnO4
(d) K2MnO4
Answer:

Option (b)

144.
Chromic acid means _____ .
(a) K2Cr2O7 + conc. HNO3
(b) K2Cr2O7 + conc. H2SO4
(c) KMnO4 + conc. HNO3
(d) KMnO4 + conc. H2SO4
Answer:

Option (b)

145.
Which of the following elements are included in lanthanide series ?
(a) Th to Lr
(b) Ce to Lu
(c) Sc to Zn
(d) Y to Cd
Answer:

Option (b)

146.
How many elements are included in lanthanide series and actinide series respectively ?
(a) 14,15
(b) 15,14
(c) 14,14
(d) 15,15
Answer:

Option (c)

147.
in 5d - orbital of which elements of lanthanide series electrons are filled ?
(a) Ce, Pm, Tb
(b) Ce, Gd, Lu
(c) Ce, Gd, La
(d) Tm, Yb, Lu
Answer:

Option (b)

148.
What is general electronic configuration of elements of actinide series ?
(a) [Rn] 5f0-146d0-27s2
(b) [Rn] 5f0-145d0-25s2
(c) [Rn] 5f0-145d0-24s2
(d) [Rn] 5f0-146d0-26s2
Answer:

Option (a)

149.
Which of the following statements is correct ?
(a) Actinoids are like gold in appearance.
(b) The stable oxidation state of all actinoids is (+3).
(c) Only promethium is the radioactive.
(d) All the actinoids are radioactive.
Answer:

Option (d)

150.
What effect is observed in Ln2O3 type oxides if we move from left to right in periodic table ?
(a) Basicity increases
(b) Basicity decreases
(c) Acidity decreases
(d) Ionic size increases
Answer:

Option (b)

Showing 141 to 150 out of 158 Questions
11 12 13 14 15 16