p-Block Elements MCQ's

p-Block Elements

Multiple Choice Questions

  

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1. Maximum covalency of nitrogen is ….
   1.   3
   2.   5
   3.   4
   4.   6
2. Which of the following will act as strongest reducing agent?
   1.   NH₃
   2.   PH₃
   3.   AsH₃
   4.   SbH₃
3. Which of the following elements can be involved in pЛ-dЛ bonding?
   1.   Carbon
   2.   Phosphorus
   3.   Boron
   4.   Nitrogen
4. Which of the following elements does not show allotropy?
   1.   Nitrogen
   2.   Bismuth
   3.   Antimony
   4.   Arsenic
5. Which of the following is not tetrahedral
   1.   NH₄⁺
   2.   SiCl₄
   3.   SF₄
   4.   SO₄^2-
6. A brown ring is formed in the ring test for NO₃^- ion. It is due to the formation of
   1.   FeSO₄.NO₂
   2.   [FeSO₄.HNO₃]
   3.   [Fe(H₂O)₄(NO)₂]₂⁺
   4.   [Fe(H₂O)₅(NO)]₂⁺
7. The shape of ammonia molecule is ….
   1.   square planar with nitrogen atom at the apex.
   2.   trigonal pyramidal with the nitrogen atom at the apex.
   3.   tetrahedral planar with the nitrogen atom at the apex.
   4.   None of the above.
8. Rhombic and monoclinic sulphur prepared, respectively from
   1.   roll sulphur in CS₂ and rhombic sulphur.
   2.   monoclinic sulphur and roll sulphur in CS₂.
   3.   monoclinic sulphur and rhombic sulphur.
   4.   roll sulphur in CS₂ and roll sulphur in CS₂.
9. Which of the following is isoelectronic pair?
   1.   ICl₂, ClO₂
   2.   BrO₂^-, BrF₂⁺ Correct
   3.   ClO₂, BrF₂
   4.   CN^-, O₃
10. The catalyst used in contact process for the production of H₂SO₄ is
    1.   Al₂O₃
    2.   V₂O₅
    3.   MnO₂
    4.   Cr₂O₃
11. Correct order of electron affinity for halogen is
    1.   F > Cl > Br > I
    2.   F < Cl < Br < I
    3.   F < Cl > Br > I
    4.   F > Cl < Br > I
12. 4 HCl + O₂ --CuCl₂----> 2 Cl₂ + 2 H₂O
    The above reaction of chlorine preparation is of
    
    1.   Deacon’s process
    2.   Contact process
    3.   Electrolytic process
    4.   None of the above.
13. Consider the following reaction:
    I. 2 NaOH (Cold and Dilute) + Cl₂ → A + B + H₂O
    II. 6 NaOH (Hot and Conc.) + 3 Cl₂ → C + D + 3 H₂O
    
    1.   A = NaCl, B = NaClO₃, C = NaOCl, D = 5 NaCl
    2.   A = 5NaCl, B = NaClO₃, C = NaOCl, D = NaCl
    3.   A = NaCl, B = NaOCl, C = 5NaCl, D = NaClO₃
    4.   A = 5NaCl, B = NaOCl, C = NaCl, D = NaClO₃
14. In the preparation of compounds of Xe, Bartlett had taken O₂⁺PtF₆^- as a base compound. This is because
    1.   both O₂ and Xe have same size.
    2.   both O₂ and Xe have same electron gain enthalpy.
    3.   both O₂ and Xe have almost same ionisation enthalpy.
    4.   both O₂ and Xe are gases.
15. Match the items of columns I and II and mark the correct option.
    
    1.   A-1, B-4, C-2, D-3
    2.   A-1, B-2, C-3, D-4
    3.   A-2, B-1, C-4, D-3
    4.   A-1, B-3, C-2, D-4
16. Which of the following statements is wrong?
    1.   Single N-N bond is stronger than the single P-P bond.
    2.   PH₃ can act as a ligand in the formation of coordination compound with transition elements.
    3.   NO₂ is paramagnetic in nature.
    4.   Covalency of nitrogen in N₂O₅ is four.
17. Ozone is obtained from oxygen:
    1.   By oxidation at high temperature
    2.   By oxidation using a catalyst
    3.   By silent electric discharge
    4.   By conversion at high pressure
18. Which one is known as oil of vitriol?
    1.   H₂SO₃
    2.   H₂SO₄
    3.   H₂S₂O₇
    4.   H₂S₂O₈
19. Ammonium nitrate decomposes on heating into:
    1.   Ammonia and nitric acid
    2.   Nitrous oxide and water
    3.   Nitrogen, hydrogen and ozone
    4.   Nitric oxide, nitrogen dioxide and hydrogen
20. Which of the following dissociates to give H⁺ most easily?
    1.   H₂O
    2.   H₂S
    3.   H₂Se
    4.   H₂Te
21. Which of the following acids is a liquid?
    1.   HF
    2.   HCl
    3.   HBr
    4.   HI
22. In which case, the order of acidic strength is not correct?
    1.   HI > HBr > HCl
    2.   HClO₄ > HClO₃ > HClO₂
    3.   HIO₄ > HBrO₄ > HClO₄
    4.   HF > H₂O > NH₃
23. Which of the following has lowest bond dissociation energy?
    1.   Cl-Cl
    2.   F-F
    3.   Br-Br
    4.   I-I
24. Who among the following first prepared a stable compound of noble gas?
    1.   Rutherford
    2.   Neil Bartlett
    3.   Rayleigh
    4.   Ramsay
25. The shape of XeO₂F₂ molecule is:
    1.   Trigonal bipyramidal
    2.   Square planar
    3.   Tetrahedral
    4.   See-saw
26. Which of the following statement is true about ozone layer?
    1.   It is harmful because ozone is dangerous to living organism.
    2.   It is beneficial because oxidation reaction can proceed faster in the presence of ozone.
    3.   It is beneficial because ozone cuts out the ultraviolet radiation of the sun.
    4.   It is harmful because ozone cuts out the important radiation of the sun which are vital for photosynthesis.
27. The correct melting point order of hydrides of group 15 elements is:
    1.   NH₃ > PH₃ < AsH₃ < SbH₃
    2.   NH₃ > PH₃ > AsH₃ > SbH₃
    3.   NH₃ < PH₃ < AsH₃ < SbH₃
    4.   NH₃ < PH₃ > AsH₃ > SbH₃
28. Consider the following reaction,
    NH₄Cl (aq) + A ----> B + 2 H₂O (l) + NaCl (aq)
    In the above reaction A and B respectively are:
    1.   NaNO₃ (aq), N₂ (g)
    2.   NaNO₂ (aq), H₂ (g)
    3.   NaNO₂ (aq), N₂ (g)
    4.   None of the above.
29. Extra pure N₂ can be obtained by heating:
    1.   NH₃ with CuO
    2.   NH₄NO₃
    3.   (NH₄)₂Cr₂O₇
    4.   Ba(N₃)₂
30. Dinitrogen:
    1.   is a colourless, odourless, tasteless and non-toxic gas
    2.   has a very low solubility in water
    3.   is rather inert at room temperature
    4.   All of the above.
31. Give the products of the following reaction:
    (i) Li + N₂ --> (ii) Mg + N₂ -> (iii) N₂ (g) + H₂ (g) -->
    1.   (i) Li₂N (ii) Mg₃N₂ (iii) NH₃
    2.   (i) Li₂N (ii) Mg₃N (iii) NH₃
    3.   (i) Li₃N (ii) Mg₃N (iii) 2 NH₃
    4.   (i) 2Li₃N (ii) Mg₃N₂ (iii) 2 NH₃
32. Fluorine is the best oxidising agent because it has:
    1.   highest electron affinity
    2.   highest reduction potential
    3.   highest oxidation potential
    4.   lowest electron affinity
33. On heating, lead nitrate forms oxides of nitrogen and lead. The oxides are ….
    1.   N2O, PbO
    2.   NO2, PbO
    3.   NO, PbO
    4.   NO, PbO2
34. Interhalogen compounds are more reactive than the individual halogens because:
    1.   they are prepared by direct combination of halogens.
    2.   X-X’ bond is weaker than X-X or X’-X’ bonds.
    3.   they are thermally more stable than halogens
    4.   there is a large difference in their electronegativity.
35. Match the column I with column II and mark the appropriate choice:
    
    1.   A -> (i), B -> (ii), C -> (iii), D -> (iv)
    2.   A -> (iv), B -> (iii), C -> (ii), D -> (i)
    3.   A -> (iii), B -> (iv), C -> (i), D -> (ii)
    4.   A -> (ii), B -> (iii), C -> (iv), D -> (i)

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