NEET AIPMT Chemistry Chapter Wise Solutions - p-Block Elements (Group 13 and 14)

NEET AIPMT Chemistry Chapter Wise Solutions – p-Block Elements (Group 13 and 14)

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NEET AIPMT Chemistry Chapter Wise Solutions Physics Biology

1. It is because of inability of ns² electrons of the valence shell to participate in bonding that (MEET 2017)
(a) Sn²⁺ is oxidising while Pb⁴⁺ is reducing
(b) Sn²⁺ and Pb²⁺ are both oxidising and reducing
(c) Sn⁴⁺ is reducing while Pb⁴⁺‘ is oxidising
(d) Sn²⁺ is reducing while Pb⁴⁺ is oxidising.

2. Boric acid is an acid because its molecule (NEET-ll 2016)
(a) contains replaceable H⁺ ion
(b) gives up a proton
(c) accepts OH from water releasing proton
(d) combines with proton from water molecule.

3. AlF₃ is soluble in HF only in presence of KF. It is due to the formation of (NEET-ll 2016)
(a) K₃[AlF₃H₃]
(b) K₃[AlF₆]
(c) AlH₃
(d) K[AlF₃H]

4. The stability of + 1 oxidation state among Al. Ga, In and Tl increases in the sequence (2015. 2009)
(a) Al < Ga < In < Tl
(b) Tl < In < Ga < Al
(c) In < Tl < Ga < Al
(d) Ga < In < Al < Tl

5. Which of the following structure is similar to graphite?(NEET 2013)
(a) B₄C
(b) B₂H₆
(c) BN
(d) B

6. Which of these is not a monomer for a high molecular mass silicone polymer? (NEET 2013)
(a) Me₃SiCl
(b) PhSiCl₃
(c) MeSiCL₃
(d) Me₂SiCl₂

7. The basic structural unit of silicates is (NEET 2013)
(a) SiO₃^2-
(b) Si0₄^2-
(c) SiO^–
(d) SiO₄^4-

8. Which statement is wrong? (Karnataka NEET 2013)
(a) Beryl is an example of cyclic silicate.
(b) Mg₂Si0₄ is orthosilicate.
(c) Basic structural unit in silicates is the Si0₄ tetrahedron.
(d) Feldspars are not aluminosilicates.

9. Name the two type of the structure of silicate in which one oxygen atom of [Si0₄]^4- is shared? (2011)
(a) Linear chain silicate
(b) Sheet silicate
(c) Pyrosilicate
(d) Three dimensional

10. Which of the following statements is incorrect? (Mains 2011)
(a) Pure sodium metal dissolves in liquid ammonia to give blue solution.
(b) NaOH reacts with glass to give sodium silicate.
(c) Aluminium reacts with excess NaOH to give Al(OH)₃.
(d) NaHC0₃on heating gives Na₂C0₃.

11. Which of the following oxide is amphoteric? (Mains 2011)
(a) Sn0₂
(b) CaO
(c) Si0₂
(d) C0₂

12. Which one of the following molecular hydrides acts as a Lewis acid? (2010)
(a) NH₃
(b) H₂0
(c) B₂H₆
(d) CH₄

13. The tendency of BF₃, BCl₃ and BBr₃ to behave as Lewis acid decreases in the sequence (2010)
(a) BCl₃ >BF₃ > BBr₃
(b) BBr₃ > BCl₃ > BF₃
(c) BBr₃ > BF₃>BCl₃
(d) BF₃>BCl₃>BBr₃

14. The straight chain polymer is formed by (2009)
(a) hydrolysis of CH₃SiCl₃ followed by condensation polymerisation
(b) hydrolysis of (CH₃)₄Si by addition polymerisation
(c) hydrolysis of (CH₃)₂SiCl₂ followed by condensation polymerisation
(d) hydrolysis of (CH₃)₃SiCl followed by condensation polymerisation.

15. Which of the following oxidation states are the most characteristic for lead and tin respectively? (2007)
(a) +2,+4
(b) +4,+4
(c) +2,+2
(d) +4,+2.

16. Which of the following anions is present in the chain structure of silicates? (2007)
(a) (Si₂0₅^2- )n
(b) (SiO₃^2-)n
(c) SiO₄^4-
(d) Si₂O₇^6-

17. Which of the following is the most basic oxide? (2006)
(a) Se0₂
(b) Al₂0₃
(c) Sb₂0₃
(d) Bi₂0₃

18. The correct order regarding the electronegativity of hybrid orbitals of carbon is (2006)
(a) sp < sp² < sp³
(b) sp > sp² < sp³
(c) sp > sp² > sp³
(d) sp < sp² > sp³

19. Which one of the following statements about the zeolite is false? (2004)
(a) They are used as cation exchangers.
(b) They have open structure which enables them to take up small molecules.
(c) Zeolites are aluminosilicates having three dimensional network.
(d) Some of the SiO₄^4- units are replaced by AlO₄^5- and AlO₆^9- ions in zeolites.

20. Which one of the following compounds is not a protonic acid? (2003)
(a) B(OH)₃
(b) PO(OH)₃
(c) SO(OH)₂
(d) S0₂(OH)₂

21. Which compound is electron deficient? (2000)
(a) BeCl₂
(b) BCl₃
(c) CCl₄
(d) PCl₅

22. Which of the following does not show electrical conduction? (1999)
(a) Diamond
(b) Graphite
(c) Potassium
(d) Sodium

23. The type of hybridisation of boron in diborane is (1999)
(a) sp³-hybridisation
(b) sp²-hybridisation
(c) sp-hybridisation
(d) sp³d^2-hybridisation

24. Percentage of lead in lead pencil is (1999)
(a) 80
(b) 20
(c) zero
(d) 70

25. In graphite, electrons are (1997,1993)
(a) localised on each C-atom
(b) localised on every third C-atom
(c) spread out between the structure
(d) present in anti-bonding orbital.

26. Boron compounds behave as Lewis acids, because of their (1996)
(a) ionisation property
(b) electron deficient nature
(c) acidic nature
(d) covalent nature.

27. Aluminium (III) chloride forms a dimer because aluminium (1995)
(a) belongs to 3rd group
(b) can have higher coordination number
(c) cannot form a trimer
(d) has high ionization energy.

28. The BCl₃ is a planar molecule whereas NCl₃ is pyramidal because (1995)
(a) nitrogen atom is smaller than boron atom
(b) BCl₃ has no lone pair but NCl₃ has a lone pair of electrons
(c) B—Cl bond is more polar than N—Cl bond
(d) N—Cl bond is more covalent than B—Cl bond.

29. Method used for obtaining highly pure silicon, used as a semiconductor material, is (1994)
(a) crystallization
(b) zone refining
(c) oxidation
(d) electro-chemical.

30. Carbon and silicon belong to (IV) group. The maximum coordination number of carbon in commonly occurring compounds is 4, whereas that of silicon is 6. This is due to (1994)
(a) availability of low lying d-orbitals in silicon
(b) large size of silicon
(c) more electropositive nature of silicon
(d) both (b) and (c).

31. Which of the following statements about H₃B0₃ is not correct? (1994)
(a) It has a layer structure in which planar B0₃ units are joined by hydrogen bonds.
(b) It does not act as proton donor but acts as a Lewis acid by accepting hydroxyl ion.
(c) It is a strong tribasic acid.
(d) It is prepared by acidifying an aqueous solution of borax.

32. Na+, Mg2+, Al3+ and Si4+ are isoelectronic, their ionic size will follow the order (1993)
(a) Na⁺ > Mg²⁺ < Al³⁺ < Si⁴⁺
(b) Na⁺ < Mg²⁺ < Al³⁺ < Si⁴⁺
(c) Na⁺> Mg²⁺ > Al³⁺ > Si⁴⁺
(d) Na⁺ < Mg²⁺ > Al³⁺ < Si⁴⁺

33. Which of the following types of forces bind together the carbon atoms in diamond? (1992)
(a) Ionic
(b) Covalent
(c) Dipolar
(d) van der Waals

34. Water gas is produced by (1992)
(a) passing steam through a red hot coke bed
(b) saturating hydrogen with moisture
(c) mixing oxygen and hydrogen in the ratio of 1 : 2
(d) heating a mixture of C0₂ and CH₄ in petroleum refineries.

35. Which of the following is an insulator? (1992)
(a) Graphite
(b)Aluminum
(c) Diamond
(d)Silicon

36. Glass is a (1991)
(a) liquid
(b)Solid
(c) supercooled liquid
(d) transparent organic polymer.

37. The ability of a substance to assume two or more crystalline structures is called (1990)
(a) isomerism
(b) polymorphism
(c) isomorphism
(d) amorphism.

38. The substance used as a smoke screen in warfare is (1989)
(a)SiCl₄
(b)PH₃
(c)PCl₅
(d)acetylene