The Pblock Elements Test

The Pblock Elements

This is the pblock elements Test-02 for CBSE class 12 Chemistry.. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

1
is the structure of
Question 1 figure 1
  • A
    Pyrophosphoric acid
  • B
    Phosphorous acid
  • C
    Phosphoric acid
  • D
    Hypophosphorus.
    Correct
2
Elements of which group are known as ore forming elements?
  • A
    Group 16
    Correct
  • B
    Group 15
  • C
    Group 17
  • D
    Group 18
3
Most metal oxides are
  • A
    Covalent in nature
  • B
    Acidic in nature
  • C
    Ionic in nature
    Correct
  • D
    None of these
4
The stability of hydrides of group 16 elements decreases in the order
  • A
    Option A
  • B
    Option B
  • C
    Option C
    Correct
  • D
    Option D
5
Formula of oleum is
  • A
    ${H_2}{S_2}{O_6}$
  • B
    ${H_2}{S_2}{O_8}$
  • C
    $\begin{array}{*{20}{l}} {{H_2}{S_2}{O_7}} \end{array}$
    Correct
  • D
    ${H_2}S{O_5}$
6
Which among the following does not exhibit positive oxidation state?
  • A
    Oxygen
  • B
    Fluorine
    Correct
  • C
    Nitrogen
  • D
    Chlorine
7
Fluorine reacts with H2S to produce
  • A
    $SF_6 ,S$ and HF
  • B
    $SF_4$ and HF
    Correct
  • C
    $SF_6$ and HF
  • D
    $SF_2 and HF4
8
Which of the following is the strongest Lewis base?
  • A
    $NCl_3$
  • B
    $NBr_3$
  • C
    $NF_3$
  • D
    $NI_3$
    Correct
9
Which of the following is an amphoteric oxide?
  • A
    $Sn{O_2}$
  • B
    $C{l_2}{O_7}$
  • C
    ${V_2}{O_5}$
  • D
    $C{r_2}{O_3}$
    Correct
10
Which gas has a smell of rotten fish?
  • A
    $NH_3$
  • B
    $PH_3$
    Correct
  • C
    NO
  • D
    $P_2O_3$
11
Which of the following turns lead acetate paper black?
  • A
    $H_2S$
    Correct
  • B
    $SO_3$
  • C
    $SO_2$
  • D
    ${H_2}S{O_4}$
12
Which gas is evolved when urea is treated with NaOH?
  • A
    Laughing gas
  • B
    Nitrogen
  • C
    Ammonia
    Correct
  • D
    Nitrous oxide
13
Ozone reacts with KOH solution to form
  • A
    $O_2$
  • B
    $O_3$ and $KO_2$
  • C
    $O_2 $ and $KO_2$
  • D
    $KO_3$
    Correct
14
Hydrogen sulphide reacts with lead acetate forming a black compound which reacts with hydrogen peroxide to form another compound. The colour of the compound is
  • A
    Black
  • B
    White
    Correct
  • C
    Pink
  • D
    Yellow
15
Which of the following is thermally the most stable?
  • A
    $H_2Se$
  • B
    $H_2Te$
  • C
    $H_2O$
    Correct
  • D
    $H_2S$