p-block elements (group 13 & group 14)

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Test1 Max. Marks = 40

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1. In the sale of diamonds the unit of weight is carat One carat is equal to :

4 points

(A) 100 mg

(B) 300 mg

(D) 200 mg

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2. In silicon dioxide :

4 points

(A) Each silicon atom in surrounded by four oxygen atoms and each oxygen atom is bonded to two silicon atoms

(B) Each silicon atom is surrounded by two oxygen atoms and each oxygen atoms is bonded to two silicon atoms

(D) There are double bonds between silicon and oxygen atoms

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3. Which of the following oxide is amphoteric:

4 points

(A) CaO

(B) CO₂

(D) SnO₂

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4.Which of the following halides is least stable and has doubtful existence ?

4 points

(A) Cl₄

(B) GeI₄

(D) PbI₄

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5. H₃BO₃ is :-

4 points

(A)Monobasic and weak Lewis acid

(B)Monobasic and weak Bronsted acid

(D) Tribasic and weak Bronsted acid

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6. Which gas is liberated when Al₄C₃ is hydrolysed: -

4 points

(A) CH₄

(B) C₂H₂

(D) CO₂

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7. C₆₀ contains :

4 points

(A) 20 pentagons and 12 hexagons

(B) 12 pentagons and 20 hexagons

(D) 24 pentagons and 36 hexagons

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8. The structure of diborane contains

4 points

(A) Four 2c-2e bonds and four 3c-2e bonds

(B) Two 2c-2e bonds and two 3c-2e bonds

(D) Four 2c-2e bonds and two 3c-2e bonds

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9. Graphite is good conductor of current but diamond is non-conductor because :

4 points

(A) Diamond is hard and graphite is soft

(B) graphite and diamond have different atomic configuration

(D) Graphite has hexagonal layer structure with mobile -electrons while diamond has continuous tetrahedral covalent structure with no free electrons

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10. Carbon monoxide acts as a Lewis base because it has

4 points

(A) A double bond between C and O atoms

(B) A triple bond between C and O atoms

(D) Two lone pairs of electrons on the O atom

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