The Pblock Elements Test

The Pblock Elements

This is the pblock elements Test-04 for CBSE class 12 Chemistry.. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

1
A metal X on heating in nitrogen gas gives Y. Y on treatment with water gives a colourless gas which when passed through copper sulphate solution gives a blue colour. Y is
  • A
    $Mg_3N_2$
    Correct
  • B
    MgO
  • C
    $NH_3$
  • D
    $Mg(NO_3)2$
2
The reagent used to distinguish between $H_2O_2$ and $O_3$ is
  • A
    Starch and iodine
  • B
    $KMnO_4$
    Correct
  • C
    PbS
  • D
    Bleaching powder
3
Which of the following is soluble in turpentine oil?
  • A
    Oxygen
    Correct
  • B
    Hydrogen sulphide
  • C
    Nitrogen
  • D
    Ozone
4
The crystals of ferrous sulphate on heating give
  • A
    $FeO{\text{ }} + {\text{ }}S{O_3} + {H_2}S{O_4} + {H_2}O$
  • B
    $F{e_2}{O_3} + S{O_2} + S{O_3} + {H_2}O$
    Correct
  • C
    $\begin{array}{*{20}{l}} {F{e_2}{O_3} + {H_2}S{O_4} + {H_2}O} \end{array}$
  • D
    $FeO{\text{ }} + {\text{ }}{H_2}O + S{O_2}$
5
When chlorine is passed through concentrated hot solution of KOH, the compound formed is
  • A
    $KClO_4$
  • B
    $KClO_2$
  • C
    $KClO_3$
    Correct
  • D
    KClO
6
Ammonia can be dried using
  • A
    $CaCl_2$
  • B
    CaO
    Correct
  • C
    $P_4O_{10}$
  • D
    $H_2SO_4$
7
The gases absorbed by alkaline pyrogallol and oil of cinnamon are respectively,
  • A
    $O_2$ and $O_3$
    Correct
  • B
    $SO_2$ and $O_3$
  • C
    $SO_2$ and $CH_4$
  • D
    $O_3$ and $CH_4$
8
Which one of the following acts as an antichlor?
  • A
    $MnO_2$
  • B
    ${K_2}C{r_2}{O_7}$
  • C
    $Na_2S_2O_3$
  • D
    $NaHSO_3$
    Correct
9
When KBr is treated with conc. $H_2SO_4$, reddish brown gas is evolved. The gas is
  • A
    $Br_2$
    Correct
  • B
    $H_2O_2$
  • C
    $Br_2$ + HBr
  • D
    $NO_2$
10
Pure chlorine is obtained
  • A
    By heating MnO2 and HCl
    Correct
  • B
    By heating mixture of NaCl and MnO2 with conc. Sulphuric acid
  • C
    By treating bleaching powder with HCl
  • D
    By heating PtCl4
11
When sugar is treated with conc. Sulphuric acid, the sugar is charred. In this process, sugar is
  • A
    Reduced
  • B
    Dehydrated
    Correct
  • C
    Sulphonated
  • D
    Oxidised
12
How many moles of oxygen are obtained by heating 8 mol of potassium chlorate?
  • A
    12
  • B
    16
    Correct
  • C
    28
  • D
    8
13
First compound of inert gas was prepared by Bartlett in 1962. The compound is
  • A
    $XeO_3$
  • B
    $XeF_6$
  • C
    $XeOF_4$
    Correct
  • D
    $XePtF_6$
14
A radioactive element which can decay to give two noble gases is
  • A
    $Ra^{226}$
  • B
    $Th^{232}$
    Correct
  • C
    $U^{238}$
  • D
    $AC^{239}$
15
Available chlorine is librated from bleaching powder when
  • A
    It is heated
  • B
    It is reacted with water
  • C
    It is reacted with alkali solution
    Correct
  • D
    It is reacted with acid