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31 Year NEET Previous Year Questions: The p-Block Elements - 1 - NEET MCQ


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20 Questions MCQ Test Chemistry Class 12 - 31 Year NEET Previous Year Questions: The p-Block Elements - 1

31 Year NEET Previous Year Questions: The p-Block Elements - 1 for NEET 2024 is part of Chemistry Class 12 preparation. The 31 Year NEET Previous Year Questions: The p-Block Elements - 1 questions and answers have been prepared according to the NEET exam syllabus.The 31 Year NEET Previous Year Questions: The p-Block Elements - 1 MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for 31 Year NEET Previous Year Questions: The p-Block Elements - 1 below.
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31 Year NEET Previous Year Questions: The p-Block Elements - 1 - Question 1

Which one of the  following orders is not in accordance with the property stated against is ? [2006]

Detailed Solution for 31 Year NEET Previous Year Questions: The p-Block Elements - 1 - Question 1

Bond dissociation energy of fluorine is less because of its small size and repulsion between electrons of two atoms. So option (c) is wrong order. The correct order is [Cl2 > Br2 > F2 > I2]

31 Year NEET Previous Year Questions: The p-Block Elements - 1 - Question 2

Which one of the following orders correctly represents the increasing acid strengths of the given acids? [2007]

Detailed Solution for 31 Year NEET Previous Year Questions: The p-Block Elements - 1 - Question 2

As the oxidation number of the central atom increases, strength of acid also increases.

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31 Year NEET Previous Year Questions: The p-Block Elements - 1 - Question 3

Which one of the following  arrangements does not give the correct picture of the trends indicated against it ? [2008]

Detailed Solution for 31 Year NEET Previous Year Questions: The p-Block Elements - 1 - Question 3

From the given options we find option (a) is correct. The oxidising power of halogens follow the order F2 > Cl2 > Br2 > I2 . Option (b) is incorrect because it in not the correct order of electron gain enthalpy of halogens. The correct order is Cl2 > F2 > Br2 > I2 . The low value of F2 than Cl2 is due to its small size. Option (c) is incorrect. The correct order of bond dissociation energies of halogens is Cl2 > Br2 > F2 > I2 . Option (d) is correct. It is the correct order of electronegativity values of halogens. Thus option (b) and (c) are incorrect.

31 Year NEET Previous Year Questions: The p-Block Elements - 1 - Question 4

In the case of alkali metals, the covalent character decreases in the order: [2009]

Detailed Solution for 31 Year NEET Previous Year Questions: The p-Block Elements - 1 - Question 4

MI > MBr > MCl > MF. As the size of the anion decreases covalency decreases.

31 Year NEET Previous Year Questions: The p-Block Elements - 1 - Question 5

Among the following which is the strongest oxidising agent? [2009]

Detailed Solution for 31 Year NEET Previous Year Questions: The p-Block Elements - 1 - Question 5

Standard reduction potential of halogens are positive and decreases from fluorine to iodine. Therefore halogens act as strong oxidising agent and their oxidising power decreases from fluorine to iodine.

31 Year NEET Previous Year Questions: The p-Block Elements - 1 - Question 6

The correct order of increasing bond angles in the following species are : [2010]

Detailed Solution for 31 Year NEET Previous Year Questions: The p-Block Elements - 1 - Question 6

The correct order of increasing bond angle is   

* In ClO2there are 2 lone pairs of electrons present on the central chlorine atom. Therefore the bond angle in ClO2 is less than 118° which is the bond angle in ClO2 which has less number of electrons on chlorine.

31 Year NEET Previous Year Questions: The p-Block Elements - 1 - Question 7

Oxidation states of P in H4 P2O5 , H4 P2O6 , and H4 P2O7 , are respectively: [2010]

Detailed Solution for 31 Year NEET Previous Year Questions: The p-Block Elements - 1 - Question 7

The correct answer is Option D.

H4P2O5 ;
​4+2x−10=0                           
​2x=6
x= +3 
 
H4P2O6
4+2x−12=0
2x=8   
x= +4
 
H4P2O7 
4+2x−14=0                     
2x=10                                                           
 x= +5
 

31 Year NEET Previous Year Questions: The p-Block Elements - 1 - Question 8

Which one of the following compounds is a peroxide ? [2010]

Detailed Solution for 31 Year NEET Previous Year Questions: The p-Block Elements - 1 - Question 8

 

KO2 is known as potassium superoxide. It is paramagnetic in nature. It is formed by the direct reaction of oxygen gas and potassium metal. ... BaO2 is a peroxide because in BaO2 the oxidation state of barium is +2 and oxygen has oxidation number −1.

31 Year NEET Previous Year Questions: The p-Block Elements - 1 - Question 9

Match List - I (substan ces) with List - II (processes) employed in the manufacture of the substances and select the correct option. [2010]


Detailed Solution for 31 Year NEET Previous Year Questions: The p-Block Elements - 1 - Question 9

(a) Sulphuric acid (iv) Contact process
(b) Steel (ii) Bessemer ’s process
(c) Sodium hydroxide(iii) Leblanc process
(d) Ammonia (i) Haber ’s process
∴ Correct choice : (a)

31 Year NEET Previous Year Questions: The p-Block Elements - 1 - Question 10

How many bridging oxygen atoms are present in P4O10? [2010]

Detailed Solution for 31 Year NEET Previous Year Questions: The p-Block Elements - 1 - Question 10

∴ Correct choice : (b)

31 Year NEET Previous Year Questions: The p-Block Elements - 1 - Question 11

Which of the following structures is the most preferred and hence of lowest energy for SO3 ? [2011 M]

Detailed Solution for 31 Year NEET Previous Year Questions: The p-Block Elements - 1 - Question 11

Formal charges help in the selection of the lowest energy structure from a number of possible Lewis structures for a given compound. The lowest energy structure means the structure with the smallest formal charge on each atom of the compound. A Lewis dot structure is preferable when all formal charges are zero.

31 Year NEET Previous Year Questions: The p-Block Elements - 1 - Question 12

Which of the following oxide is amphoteric ?

Detailed Solution for 31 Year NEET Previous Year Questions: The p-Block Elements - 1 - Question 12

SnO2 is an amphoteric oxide because it reacts with acids as well as bases to form corresponding salts.

31 Year NEET Previous Year Questions: The p-Block Elements - 1 - Question 13

In which of the following compounds, nitrogen exhibits highest oxidation state ? [2012]

Detailed Solution for 31 Year NEET Previous Year Questions: The p-Block Elements - 1 - Question 13

Thus, nitrogen exhibits highest oxidation state in N3H
Thus question can also be credited to redox reactions 

31 Year NEET Previous Year Questions: The p-Block Elements - 1 - Question 14

Which of the following statements is not valid for oxoacids of phosphorus? [2012]

Detailed Solution for 31 Year NEET Previous Year Questions: The p-Block Elements - 1 - Question 14

Hypophosphorous acid

(H3PO2) is a monobasic acid. i.e., it has only one ionisable hydrogen atom or one OH is present

31 Year NEET Previous Year Questions: The p-Block Elements - 1 - Question 15

Sulphur trioxide can be obtained by which of the following reaction : [2012]

Detailed Solution for 31 Year NEET Previous Year Questions: The p-Block Elements - 1 - Question 15

31 Year NEET Previous Year Questions: The p-Block Elements - 1 - Question 16

Which is the strongest acid in the following : [NEET 2013]

Detailed Solution for 31 Year NEET Previous Year Questions: The p-Block Elements - 1 - Question 16

HClO4 is the strongest acid amongst all because the oxidation state or Cl is maximum (+7).

31 Year NEET Previous Year Questions: The p-Block Elements - 1 - Question 17

Which of the following does not give oxygen on heating? [NEET 2013]

Detailed Solution for 31 Year NEET Previous Year Questions: The p-Block Elements - 1 - Question 17

31 Year NEET Previous Year Questions: The p-Block Elements - 1 - Question 18

Which of the following is a polar molecule ? [NEET 2013]

Detailed Solution for 31 Year NEET Previous Year Questions: The p-Block Elements - 1 - Question 18

SF4 has 4 bond pairs and 1 lone pair of electrons, sp3d hybridisation leads to irregular shapeand resultant

μ ≠ 0.

31 Year NEET Previous Year Questions: The p-Block Elements - 1 - Question 19

Identify the incorrect statement, regarding the molecule XeO4: [NEET Kar. 2013]

Detailed Solution for 31 Year NEET Previous Year Questions: The p-Block Elements - 1 - Question 19

31 Year NEET Previous Year Questions: The p-Block Elements - 1 - Question 20

In which of the following arrangements the given sequence is not strictly according to the property indicated against it ? [2012 M]

Detailed Solution for 31 Year NEET Previous Year Questions: The p-Block Elements - 1 - Question 20

If acidic nature is high, Ka is high and pka is low

since pka = – log ka
Hence the order of pka will be H2O > H2S > H2Se > H2Te

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