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p-Block Elements

Comprehensive quiz covering p-block elements (groups 13-17) with focus on group 13 elements, boranes, and their compounds for GATE, CSIR NET, and engineering entrance exams.

9 Questions Published
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Questions

Question 1 Multiple Choice (Single Answer)

The general formula BnHn+6 for boranes, corresponds to

  1. closo-borane
  2. nido-boranes
  3. arachno-borane
  4. hypho-borane
  5. None of these
Question 2 Multiple Choice (Single Answer)

Assertion: BF3 is a weaker Lewis acid than BBr3.
Reason: BF3 has planar geometry and is stabilised to a greater extent than BBr3 by pπ-back bonding.

  1. Both A and R are true and R is the correct explanation of A.
  2. Both A and R are true, but R is not the correct explanation of A.
  3. A is true but R is false.
  4. A is false but R is true.
  5. Both A and R are false.
Question 3 Multiple Choice (Single Answer)

Which of the following statements is/are incorrect for boron?

P. Kernite is a mineral of boron.
Q. 10B is more abundant isotope than 11B.
R. Boron has the lower second ionisation enthalpy than aluminium.

  1. Only P
  2. Only Q
  3. Only R
  4. Only P and Q
  5. Only Q and R
Question 4 Multiple Choice (Single Answer)

Which of the following is the incorrectly matched pair of ‘compound- its specific name’?

  1. KMnO4- Baeyer’s reagent
  2. C6H5NO2- Oil of mirbane
  3. K2[HgI4]- Calgon
  4. Na3(PO3)3- Graham’s salt
  5. SiO2- Quartz
Question 5 Multiple Choice (Single Answer)

Which of the following pairs of ‘compounds - their respective nature’ is not correctly matched?

  1. Carbon dioxide- acidic
  2. SiO2- acidic
  3. Alumina- amphoteric
  4. Caro’s acid- dibasic
  5. Sulphuric acid- dibasic
Question 6 Multiple Choice (Single Answer)

Which of the following statements is/are false?

P. Gallium has higher melting and boiling point than Indium.
Q. Tusionite is the minerals of boron.
R. Gallium arsenide is used in the making of tunnel diodes for FM transmitter circuits.

  1. Only R
  2. Only Q
  3. Only R
  4. Only P and Q
  5. Only Q and R
Question 7 Multiple Choice (Single Answer)

Which of the following group of 13 elements is liquid at nearly ambient temperature?

  1. B
  2. Al
  3. Ga
  4. In
  5. Tl
Question 8 Multiple Choice (Single Answer)

Match the entries in Column-I with those in Column-II.
Column-I Column-II
P. turquoise 1. ZnS + BaSO4
Q. lithopone 2. AlPO4.Al(OH)3.H2O
R. talc 3. 3MgO.4SiO2.H2O
S. diaspore 4. Al2O3.H2O
  1. P - 2, Q - 1, R - 4, S - 3
  2. P - 2, Q - 1, R - 3, S - 4
  3. P - 3, Q - 2, R - 1, S - 4
  4. P - 2, Q - 4, R - 3, S - 1
  5. P - 4, Q - 3, R - 2, S - 1
Question 9 Multiple Choice (Single Answer)

Which of the following statements are not correct?

P. Decaborane-14 has regular icosahedron geometry.
Q. Silicon do not form [SiCl6]2- and [SiF6]2-.
R. n-Type semiconductors are made by the doping of Si atoms in Ga atoms.

  1. Only P and Q
  2. Only Q and R
  3. Only P and R
  4. All of these
  5. Only R
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