p-Block Elements Test

Result

p-Block Elements Test - 29

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Weekly Quiz Competition

Question 1
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Direction (Q. Nos. 1-10) This section contains 10 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONLY ONE option is correct.
Q.
Which of the following is/are correct statement(s) regarding noble gases?
i. He₂ molecule does not exist
ii. value for noble gases is 1.4
iii. Heaviest noble gas present in air is xenon.
iv. 6th period starts with caesium and ends with radon.

A
i, iii and iv

B
i, ii and iv

C
ii, iii and iv

D
All are correct

Solution

value for noble gases is 1.66
Question 2
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Which statement is false?

A
118th element is a noble gas called ununoctium

B
Helium is lightest noble gas

C
Xenon is the most reactive among the rare gases

D
Noble gases Ne, Kr and Xe were discovered by Ramsay and Rayleigh

Solution

These three gases were discovered by Travers and Ramsay
Question 3
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The ionisation potential of hydrogen atom is 13.6 eV. Then ionisation potential of He⁺ ion is

A
27.2 eV

B
6.8 eV

C
13.6 eV

D
54.4 eV

Solution

For hydrogen like atom
Question 4
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Which of the following is/are correct among the following?
i. XeF₂ = sp³d, linear
ii. XeF₄ = sp³, square planar
iii. XeO₄ = sp³, tetrahedral
iv. XeF₆ = sp³d², octahedral

A
ii and ii

B
i and iii

C
i, ii and iii

D
Only iii

Solution

Hybridisation of the compounds are
Question 5
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The oxidation number of oxygen in O₂PtF₆ is

A
zero

B
+1/2

C
+1

D
-1/2

Solution

The structure of O₂PtF₆ is O⁺₂ [PtF₆]^-.
Oxidation tate of O₂= 2x = +1
x = + 1/2
Question 6
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The structure of ion is

A
trigonal bipyramidal

B
square pyramidal

C
octahedral

D
pentagonal

Solution
Question 7
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The number of (pπ-dπ) π-bonds present in XeO₃ and XeO₄ respectively are

A
3 and 4

B
2 and 3

C
4 and 2

D
3 and 2

Solution
Question 8
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XeF₆ on reaction with CsF produce

A
[XeF₅][CsF₂]

B
No reaction

C
[XeF₄][CsF₃]

D
Cs [XeF₇]

Solution

The correct answer is option D
CsF + XeF₆ → Cs[XeF₇]
Question 9
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Which of the following reaction occurs?

A
XeF₂+ PF₅ → XeF⁺ [PF₆]^-

B
XeF₄ + SbF₅ → [XeF₃⁺] [SbF⁶]^-

C
XeF₆ + H₂O → XeOF₄+ 2HF

D
All of these

Solution

All the cases are possible reactions.
Question 10
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The wrong statement among the following is

A
Helium is used to fill observatory balloons because it is lighter than air and non-combustible

B
A mixture of 80 % helium and 20% oxygen is used for respiration by deep sea divers

C
The noble gas used in atomic reactors is argon

D
Neon is used in discharge tubes and fluorescent bulbs for advertisement display purposes

Solution

He is used in atomic reactor for cooling.
Question 11
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Direction (Q. Nos. 11 and 12) This section is based on Statement I and Statement II. Select the correct answer from the codes given below.
Q.
Statement I : Radon is produced upon α-decay of radium atom.
Statement II : α-particles which are equivalent to the atom, reduces the atomic number by 2 and atomic mass by 4 upon decay of mother nucleus.

A
Both Statement I and Statement II are correct and Statement II is the correct explanation of Statement I

B
Both Statement I and Statement II are correct but Statement II is not the correct explanation of Statement I

C
Statement I is correct but Statement II is incorrect

D
Statement II is correct but Statement I is incorrect

Solution
Question 12
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Statement I : The structure of XeF₄ is square pyramidal.
Statement ll : The hybridisation of XeF₄ is sp³d².

A
Both Statement I and Statement II are correct and Statement II is the correct explanation of Statement I

B
Both Statement I and Statement II are correct but Statement II is not the correct explanation of Statement I

C
Statement I is correct but Statement II is incorrect

D
Statement II is correct but Statement I is incorrect

Solution

Structure of XeF₄ is square planar.
Question 13
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Direction (Q. No. 13) Choices for the correct combination of elements from Column I and Column II are given as options (a), (b), (c) and (d) out of which one is correct.
Q.
Match the Column I with Column II and mark the correct option from the codes given below.

A

B

C

D

Solution