CBSE Class 12 Chemistry – MCQ and Online Tests – Unit 7 – The p-Block Elements
Every year CBSE conducts board exams for 12th standard. These exams are very competitive to all the students. So our website provides online tests for all the 12th subjects. These tests are also very effective and useful for those who preparing for competitive exams like NEET, JEE, CA etc. It can boost their preparation level and confidence level by attempting these chapter wise online tests.
These online tests are based on latest CBSE Class 12 syllabus. While attempting these our students can identify the weak lessons and continuously practice those lessons for attaining high marks. It also helps to revise the NCERT textbooks thoroughly.
CBSE Class 12 Chemistry – MCQ and Online Tests – Unit 7 – The p-Block Elements
Question 1.
Which one of the following does not form hydrogen bonding?
(a) NH3
(b) H2O
(c) HCl
(d) HF
Answer
Answer: (c) HCl
Question 2.
Which of the following is the strongest oxidising agent?
(a) F2
(b) Cl2
(c) l2
(d) Br2
Answer
Answer: (a) F2
Question 3.
Main source of helium is
(a) Air
(b) Radium
(c) Monazite
(d) Water
Answer
Answer: (c) Monazite
Question 4.
Which one of the following dement is liquid at normal temperature?
(a) zinc
(b) mercury
(c) bromine
(d) water
Answer
Answer: (b) mercury
Question 5.
Modern periodic table is given by
(a) Debonair
(b) Mendeleef
(c) Mendel
(d) None of these
Answer
Answer: (b) Mendeleef
Question 6.
The number of P-O-P bonds in cyclic metaphosphoric acid is
(a) 2
(b) 0
(c) 3
(d) 4
Answer
Answer: (a) 2
Question 7.
Boron shows diagonal relation with
(a) Al
(b) C
(c) Si
(d) Sn
Answer
Answer: (c) Si
Question 8.
Which one of the following elements is found in free state in nature?
(a) Sodium
(b) Iron
(c) Zinc
(d) Gold
Answer
Answer: (d) Gold
Question 9.
Which of the following has maximum ionisation potential?
(a) Al
(b) P
(c) Si
(d) Mg
Answer
Answer: (b) P
Question 10.
Which of the following oxides is an hydride of nitrous acid ?
(a) N2O3
(b) NO2
(c) NO
(d) N2O4
Answer
Answer: (a) N2O3
Question 11.
Which oxide of nitrogen is obtained on heating ammonium nitrate at 250°C ?
(a) Nitric oxide
(b) Nitrous oxide
(c) Nitrogen dioxide
(d) Dinitrogen tetraoxide
Answer
Answer: (b) Nitrous oxide
Question 12.
Which one of the following is least basic?
(a) NCl3
(b) NBr3
(c) NI3
(d) NF3
Answer
Answer: (c) NI3
Question 13.
Sulphur molecule is
(a) diatomic
(b) triatamic
(c) tetratomic
(d) Octa-atomic
Answer
Answer: (d) Octa-atomic
Question 14.
Atomicity of phosphorus is
(a) 1
(b) 2
(c) 3
(d) 4
Answer
Answer: (d) 4
Question 15.
The structure of white phosphorus is
(a) square-planar
(b) pyramidal
(c) tetrahedral
(d) trigonal planar
Answer
Answer: (c) tetrahedral
Question 16.
Catenation property is maximum in
(a) phosphorus
(b) carbon
(c) sulphur
(d) zinc
Answer
Answer: (b) carbon
Question 17.
PCl3 on hydrolysis gives
(a) H3PO3
(b) HPO3
(c) H3PO4
(d) POCl3
Answer
Answer: (a) H3PO3
Question 18.
The shape of XeF4 is
(a) tetrahedral
(b) square planar
(c) pyramidal
(d) linear
Answer
Answer: (b) square planar
Question 19.
Arrange the following in decreasing Lewis acid strength -PF3, PCI3, PBr3, Pl3
(a) Pl3 > PBr3 > PCl3 > PF3
(b) PF3 > PCl3 > PBr3 > Pl3
(c) PCl3 > PBr3 > Pl3 > PF3
(d) PBr3 > Pl3 > PF3 > PCl3
Answer
Answer: (a) Pl3 > PBr3 > PCl3 > PF3
Question 20.
How many P-O-P bonds appear in cyclic meta-phosphoric acid?
(a) 4
(b) 3
(c) 2
(d) 1
Answer
Answer: (b) 3
Question 21.
Which of the following is a tetrabasic acid?
(a) Hypophosphorus acid
(b) Metaphosphoric acid
(c) Pyrophosphoric acid
(d) Orthophosphoric acid
Answer
Answer: (c) Pyrophosphoric acid
Question 22.
Which of the following is not correctly matched?
(a) PCl5-sp3d hybridisation
(b) PCl3-sp3 hybridisation
(c) PCl5 (solid)-[PtCl4]– [PtCl3]–
(d) H3PO3 -tribasic
Answer
Answer: (d) H3PO3 -tribasic
Question 23.
H2SO4 is a/an
(a) acid
(b) base
(c) alkali
(d) salt
Answer
Answer: (a) acid
Question 24.
Arrange the following hydrides of group 16 elements in order of increasing stability
(a) H2S < H2O < H2Te > H2Se
(b) H2O < H2Te < H2Se < H2S
(c) H2O < H2S < H2Se < H2Te
(d) H2Te < H2Se < H2S < H3O
Answer
Answer: (d) H2Te < H2Se < H2S < H3O
Question 25.
The hybridisation of sulphur in sulphur hexafluoride is
(a) sp3d
(b) sp3d2
(c) sp3d3
(d) sp3
Answer
Answer: (b) sp3d2
Question 26.
Element found from sea water is
(a) magnesium
(b) Sodium
(c) Iodine
(d) None of these
Answer
Answer: (c) Iodine
Question 27.
On heating KCIO, we get
(a) KClO2 + O2
(b) KCl + O2
(c) KCI + O3
(d) KCl + O2 + O3
Answer
Answer: (b) KCl + O2
Question 28.
Which one of the following is an electrophilic reagent?
(a) BF3
(b) KH3
(c) H2O
(d) None of these
Answer
Answer: (a) BF3
Question 29.
Which of the following is not correctly matched?
(a) Acidic oxides-P2O5 NO2, CL2O7
(b) Basic oxides-Na2Om, CaO, MgO
(c) Neutral oxides-CO2, CO, BeO
(d) Amphoteric oxides-ZnO, SnO,Al2O3
Answer
Answer: (c) Neutral oxides-CO2, CO, BeO
Question 30.
Which one of the following is the strongest lewis acid?
(a) BF3
(b) BCl3
(c) BBr3
(d) Bl3
Answer
Answer: (b) BCl3
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