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


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30 Questions MCQ Test Chemistry Class 12 - 31 Year NEET Previous Year Questions: The p-Block Elements - 2

31 Year NEET Previous Year Questions: The p-Block Elements - 2 for NEET 2024 is part of Chemistry Class 12 preparation. The 31 Year NEET Previous Year Questions: The p-Block Elements - 2 questions and answers have been prepared according to the NEET exam syllabus.The 31 Year NEET Previous Year Questions: The p-Block Elements - 2 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 - 2 below.
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31 Year NEET Previous Year Questions: The p-Block Elements - 2 - Question 1

Which of the following fertilizers has the highest nitrogen percentage ? [1993]

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

Urea (46.6%N). % of N in other compound are : ( NH4)2 SO4 = 21.2%; CaCN2 = 35.0% and NH4 NO3 = 35.0%

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

A solution of potassium bromide is treated with each of the following. Which one would liberate bromine ? [1993]

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

The correct answer is option C
Chlorine is more reactive than bromine and it displaces bromine.
If chlorine is added to a solution of potassium bromide, the bromine is replaced by the chlorine forming potassium chloride. Bromine is formed at the same time and can be detected by its colour.
2KBr + Cl2 ​⟶ 2KCl + Br2​

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31 Year NEET Previous Year Questions: The p-Block Elements - 2 - Question 3

A certain compound (X) when treated with copper sulphate solution yields a brown precipitate. On adding hypo solution, the precipitate turns white.The compound is

Detailed Solution for 31 Year NEET Previous Year Questions: The p-Block Elements - 2 - Question 3

KI reacts with CuSO4 solution to produce cuprous iodide (white precipitate) and I2 (which gives brown colour) Iodine reacts with hypo (Na2S2O35H2O) solution.
Decolourisaiton of solution shows the appearance of white precipitate.

31 Year NEET Previous Year Questions: The p-Block Elements - 2 - Question 4

Noble gases do not react with other elements because [1994]

Detailed Solution for 31 Year NEET Previous Year Questions: The p-Block Elements - 2 - Question 4

On account of highly stable ns2 np6 configuration in the valence shell. These elements have no tendency either to lose gain or share electrons with atoms of other elements i.e., their combining capacity or valency is zero. Further all the orbitals in the atoms of these elements are doubly occupied i.e electrons are not available for sharing.

31 Year NEET Previous Year Questions: The p-Block Elements - 2 - Question 5

Which of the following statements is false ? [1994]

Detailed Solution for 31 Year NEET Previous Year Questions: The p-Block Elements - 2 - Question 5

The most abundant rare gas found in the atmosphere is argon and not helium.

31 Year NEET Previous Year Questions: The p-Block Elements - 2 - Question 6

HI can be prepared by all the following methods, except[1994]

Detailed Solution for 31 Year NEET Previous Year Questions: The p-Block Elements - 2 - Question 6

HI cannot be prepared by heating iodides with concentrated H2SO4 because HI is a strong reducing agent and reduce H2SO4 to SO2 and get themselves oxidised to iodide.

31 Year NEET Previous Year Questions: The p-Block Elements - 2 - Question 7

Which among the following is paramagnetic ? [1994]

Detailed Solution for 31 Year NEET Previous Year Questions: The p-Block Elements - 2 - Question 7

ClO2 contain s 7 + 12 i.e. 19 electr ons (valence) which is an odd number, i.e. there is (are) free electron(s). Hence it is paramagnetic in nature.

31 Year NEET Previous Year Questions: The p-Block Elements - 2 - Question 8

Which one of the following oxides of chlorine is obtained by passing dry chlorine over silver chlorate at 90°C ? [1994]

Detailed Solution for 31 Year NEET Previous Year Questions: The p-Block Elements - 2 - Question 8

Pure ClO2 is obtained by passing dry Cl2 over AgClO3 at 90°C.

31 Year NEET Previous Year Questions: The p-Block Elements - 2 - Question 9

The formula for calcium chlorite is [1994]

Detailed Solution for 31 Year NEET Previous Year Questions: The p-Block Elements - 2 - Question 9

Calcium chlorite is Ca (ClO2)2

31 Year NEET Previous Year Questions: The p-Block Elements - 2 - Question 10

Polyanion formation is maximum in [1994]

Detailed Solution for 31 Year NEET Previous Year Questions: The p-Block Elements - 2 - Question 10

Due to greater tendency for catenation, sulphur shows property of polyanion formation to a greater extent. For example, in polysulphides such as 

31 Year NEET Previous Year Questions: The p-Block Elements - 2 - Question 11

The acid which has a peroxy linkage is [1994]

Detailed Solution for 31 Year NEET Previous Year Questions: The p-Block Elements - 2 - Question 11

Caro’s acid is H2SO5 which contains one S – O – O – H peroxy linkage. It is also known as permonosulphuric acids.

31 Year NEET Previous Year Questions: The p-Block Elements - 2 - Question 12

Brown ring test is used to detect [1994]

Detailed Solution for 31 Year NEET Previous Year Questions: The p-Block Elements - 2 - Question 12

Brown ring test is done for confirmation of

31 Year NEET Previous Year Questions: The p-Block Elements - 2 - Question 13

About 20 km above the earth, there is an ozone layer. Which one of the following statements about ozone and ozone layer is true? [1995]

Detailed Solution for 31 Year NEET Previous Year Questions: The p-Block Elements - 2 - Question 13

Ozone layer is beneficial to us, because it stops harmful ultraviolet radiations to reach the earth.

31 Year NEET Previous Year Questions: The p-Block Elements - 2 - Question 14

By passing H2S gas in acidified KMnO4 solution, we get [1995]

Detailed Solution for 31 Year NEET Previous Year Questions: The p-Block Elements - 2 - Question 14

Thus in this reaction sulphur (S) is produced.

31 Year NEET Previous Year Questions: The p-Block Elements - 2 - Question 15

Regarding F and Cl which of the following statements is/are correct? [1996]
(i) Cl can give up an electron more easily than F
(ii) Cl is a better reducing agent than F
(iii) Cl is smaller in size than F
(iv)F can be oxidized more readily than Cl

Detailed Solution for 31 Year NEET Previous Year Questions: The p-Block Elements - 2 - Question 15

31 Year NEET Previous Year Questions: The p-Block Elements - 2 - Question 16

Which of the following oxides will be the least acidic?[1996]

Detailed Solution for 31 Year NEET Previous Year Questions: The p-Block Elements - 2 - Question 16

As th e O.N of the central atom of the compounds increases acidic strength of that compound also increases and on moving from top to bottom in groups acidic strength of oxides also decrease due to decreasing electronegativity in groups.

31 Year NEET Previous Year Questions: The p-Block Elements - 2 - Question 17

Oxidation of thiosulphate by iodine gives [1996]

Detailed Solution for 31 Year NEET Previous Year Questions: The p-Block Elements - 2 - Question 17

31 Year NEET Previous Year Questions: The p-Block Elements - 2 - Question 18

Which one is the correct order of the size of iodine species? [1997]

Detailed Solution for 31 Year NEET Previous Year Questions: The p-Block Elements - 2 - Question 18

We know that positive ion is always smaller and negative ion is always larger than the corresponding atom. Therefore the correct order of the size is I- > I > I+

31 Year NEET Previous Year Questions: The p-Block Elements - 2 - Question 19

Which of the following species has the highest dipole moment ? [1997]

Detailed Solution for 31 Year NEET Previous Year Questions: The p-Block Elements - 2 - Question 19

Order of dipole moment decreases as NH3 > PH3 > AsH3 > SbH3 (Based upon electronegativity)

31 Year NEET Previous Year Questions: The p-Block Elements - 2 - Question 20

 The structural formula of hypophosphorous acid is

Detailed Solution for 31 Year NEET Previous Year Questions: The p-Block Elements - 2 - Question 20

We know that empirical formula of hypophosphorus acid is H3PO2. In this only one ionisable hydrogen atom is present i.e. it is monobasic. Therefore option (1) is correct structural formula of it.

31 Year NEET Previous Year Questions: The p-Block Elements - 2 - Question 21

A one litre flask is full of brown bromine vapour.The intensity of brown colour of vapour will not decrease appreciably on adding to the flask some[1998]

Detailed Solution for 31 Year NEET Previous Year Questions: The p-Block Elements - 2 - Question 21

Due to absence of reaction between marble and bromine

31 Year NEET Previous Year Questions: The p-Block Elements - 2 - Question 22

Repeated use of which one of the following fertilizers would increase the acidity of the soil?

Detailed Solution for 31 Year NEET Previous Year Questions: The p-Block Elements - 2 - Question 22

Ammonium sulphate is a salt of weak base and strong acid, so it produces acidity. Hence aqueous solution of ammonium sulphate is increases the acidity of soil.

31 Year NEET Previous Year Questions: The p-Block Elements - 2 - Question 23

During its reactions, ozone [1999]

Detailed Solution for 31 Year NEET Previous Year Questions: The p-Block Elements - 2 - Question 23

Since ozone can easily lose oxygen atom (nascent oxygen), it acts as a powerful oxidising agent, and hence reacts with hydrogen atoms.

31 Year NEET Previous Year Questions: The p-Block Elements - 2 - Question 24

Which of the following oxy-acids has the maximum number of hydrogens directly attached to phosphorus? [1999]

Detailed Solution for 31 Year NEET Previous Year Questions: The p-Block Elements - 2 - Question 24

31 Year NEET Previous Year Questions: The p-Block Elements - 2 - Question 25

Which one of the following arrangements does not truly represent the property indicated against it?[2000]

Detailed Solution for 31 Year NEET Previous Year Questions: The p-Block Elements - 2 - Question 25

The bond energy of F2 < Cl2 due to more repulsion in between non-bonding electrons (2p) of F2 in comparision to non- bonding pair (3p) repulsion in Cl2, the bond energy of F2 < Cl2.
Bond energy (kJ mol–1) :

31 Year NEET Previous Year Questions: The p-Block Elements - 2 - Question 26

Nitrogen forms N2, but phosphorus is converted into P4 from P, the reason is [2001]

Detailed Solution for 31 Year NEET Previous Year Questions: The p-Block Elements - 2 - Question 26

Nitrogen form N2 (i.e. N ≡ N) but phosphorus form P4, because in P2, pπ — pπ bonding is present which is a weaker bonding. 

31 Year NEET Previous Year Questions: The p-Block Elements - 2 - Question 27

Which of the following statements is not true ? [2003]

Detailed Solution for 31 Year NEET Previous Year Questions: The p-Block Elements - 2 - Question 27

F is more electronegative than Cl therefore HF bond is stronger than HCl and hence proton is not given off easily and hence HF is a weakest acid.

31 Year NEET Previous Year Questions: The p-Block Elements - 2 - Question 28

Which is the best description of the behaviour of bromine in the reaction given below ? [2004] H2O + Br2 → HOBr + HBr

Detailed Solution for 31 Year NEET Previous Year Questions: The p-Block Elements - 2 - Question 28

Thus here oxidation number of Br increases from 0 to +1 and also decreases from 0 to –1.
Thus  it is oxidised as well as  reduced

31 Year NEET Previous Year Questions: The p-Block Elements - 2 - Question 29

The correct order of acid strength is: [2005]

Detailed Solution for 31 Year NEET Previous Year Questions: The p-Block Elements - 2 - Question 29

As oxidation number of central atom in oxyacid increases strength increases.  Hence the correct order of acidic strength is

31 Year NEET Previous Year Questions: The p-Block Elements - 2 - Question 30

Which of the following is the most basic oxide?

Detailed Solution for 31 Year NEET Previous Year Questions: The p-Block Elements - 2 - Question 30

More the oxidation state of the central atom (metal) more is its acidity. Hence SeO2 (O. S. of Se = +4) is acidic. Further for a given O.S., the basic character of the oxides increases with the increasing size of the central atom.
Thus Al2O3 and Sb2O3 are amphoteric and Bi2O3 is basic.

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