The Dblock And Fblock Elements Test

The Dblock And Fblock Elements

This is the dblock and fblock elements Test-03 for CBSE class 12 Chemistry.. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

1
Which of the following methods is based on distribution law?
  • A
    Poling process
  • B
    Mond’s process
  • C
    Cupellation process
  • D
    Parke’s process
    Correct
2
How many carats are in 87.5% gold?
  • A
    15
  • B
    21
    Correct
  • C
    24
  • D
    18
3
How many d – block elements have ability to evolve hydrogen gas from 2% nitric acid?
  • A
    Many
  • B
    2
    Correct
  • C
    3
  • D
    1
4
Haemoglobin and chlorophyll contain
  • A
    Fe and Co
  • B
    Mg and Fe
  • C
    Fe and Mn
  • D
    Fe and Mg
    Correct
5
Which chromium compound is widely used in tanning of leather?
  • A
    $C{r_2}{O_3}$
  • B
    $CrC{l_3}$
  • C
    $Cr{O_2}C{l_2}$
  • D
    $\begin{array}{*{20}{l}} {{K_2}S{O_4}.C{r_2}{{\left( {S{O_4}} \right)}_3}.24{H_2}O} \end{array}$
    Correct
6
The production of oxidation of $I ^–$ with$Mn{O_4}^--\;$ in acidic medium is
  • A
    $I_2$
    Correct
  • B
    $I{O_3}^--$
  • C
    $I{O_4}^--$
  • D
    $I{O^--}$
7
In dilute alkaline solution, $Mn{O_4}^--\;$changes to
  • A
    $Mn{O_2}$
    Correct
  • B
    MnO
  • C
    $Mn_2O_3$
  • D
    $Mn{O_4}^{2{\text{ }}-}$
8
Which shows maximum magnetic moment among the bivalent ions of the first transition series?
  • A
    $C{o^{2 + }}$
  • B
    $N{i^{2 + }}$
  • C
    $M{n^{2 + }}$
    Correct
  • D
    $F{e^{2 + }}$
9
Which is called chromic acid?
  • A
    $Cr_2O_3$
  • B
    CrO
  • C
    $Cr_3O_4$
  • D
    $CrO_3$
    Correct
10
Which one of the following combines with $F{e^{2 + }}$ion to form a brown complex?
  • A
    $N_2O$
  • B
    $N_2O_5$
  • C
    $N_2O_3$
  • D
    NO
    Correct
11
Lucas reagent is
  • A
    $Mn{O_2} + {\text{ }}{H_2}O$
  • B
    $ZnC{l_2} + {\text{ }}HC$
    Correct
  • C
    ${H_2}S{O_4} + {\text{ }}HCl$
  • D
    $NO{\text{ }} + {\text{ }}{H_2}O$
12
Vitamin $B_12$ contains
  • A
    $F{e^{2 + }}$
  • B
    $C{o^{3 + }}$
    Correct
  • C
    $Z{n^{2 + }}$
  • D
    $C{a^{2 + }}$
13
Which is least soluble in water?
  • A
    $A{g_2}S$
    Correct
  • B
    AgBr
  • C
    AgCl
  • D
    AgI
14
A reduction in the atomic size with increase in atomic number is characteristic of the elements of
  • A
    radioactive series
  • B
    high atomic masses
  • C
    f – block
    Correct
  • D
    d – block
15
Nitrous oxide is evolved when Zn is treated with
  • A
    Nitrous acid
  • B
    Conc. Nitric acid
  • C
    Dilute nitric acid
    Correct
  • D
    None of these