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


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

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

Bleaching powder is obtained by the action of chlorine gas and [1988]

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

Cl2 gas reacts with drys laked lime, Ca (OH)2 at 40°C to give bleaching powder

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

Hypo is used in photography to [1988]

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

Undecomposed AgBr forms a soluble complex with hypo

It is washed with water and the image is fixed

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

Which of the following is a nitric acid anhydride?

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

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

Oxygen will directly react with each of th e following elements except [1989]

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

 (burns with blue light)

(burns with yellow light)

Chlorine does not react directly with oxygen.

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

Bleaching powder reacts with a few drops of dilute HCl to give [1989]

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

Bleaching powder

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

Of the following hybrides which one h as the lowest boiling point ? [1989]

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

NH3 undergoes H-bonding and hence has the highest b.p. Among the remaining hydrides i.e. PH3, AsH3 and SbH3 the b.p. increases as the size of the element increases and hence the magnitude of the van der Waal’s forces of attraction increases. Thus, PH3 has the lowest b.p.

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

Which of the following metal evolves hydrogen on reacting with cold dilute HNO3 ? [1989]

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

Magnesium and manganese are the metals that produce hydrogen with dilute nitric acid

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

Which one of the following compounds does not exist ?[1989]

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

As Nitrogen does not have d-orbital in its valence shell its maximum covalency is 3 while in the case of other elements the maximum covalency is 5.

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

Each of the following is true about white and red phosphorus except that they [1989]

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

Both white and red phosphorus are not soluble in CS2 only white P is soluble.

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

When orthophosphoric acid is heated to 600°C, the product formed is [1989]

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

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

Which one has the lowest boiling point ?[1989]

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

Due to the absence of H-bonding, PH3 has the lowest b.p. The boiling point of the Vth group hydrides is : BiH3 > SbH3 > NH3 > AsH3 > PH3

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

The gases respectively absor bed by alkaline pyrogallol and oil of cinnamon are [1989]

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

Alkaline pyrogallol absorbs O2 and oil of cinnamon absorbs O3.

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

It is possible to obtain oxygen from air by fractional distillation because [1989]

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

Air is liquified by making use of the jouleThomson effect (cooling by expansion of the gas). Water vapour and CO2 are removed by solidification. The remaining constituents of liquid air i.e., liquid oxygen and liquid nitrogen are separated by means of fractional distillation (b.p. of O2 = –183°C : b. P. of N2 = – 195.8°C).

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

Which of the following statements is not correct for nitrogen ? [1990]

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

In case of nitrogen, d-orbitals are not available.

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

The bleaching action of chlorine is due to [1991]

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

Bleaching action of chlorine is due to oxidation in presence of moisture. It is permanent

Colouring matter + | O | → colourless matter

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

Which would quickly absorb oxygen ? [1991, 92]

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

Alkaline solution of pyrogallol absorbs oxygen quickly.

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

Oleum is [1991]

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

Oleum is H2S2O7 ( H2SO4 + SO3) which is obtained by dissolving SO3 in H2SO4 and is called fuming sulphuric acid.

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

Aqueous solution of ammonia consists of

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

Aqueous solution of ammonia is obtained by passing NH3 in H2O which gives NH4+ and OH ions.

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

P2O5 is heated with water to give [1991]

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

P2O5 have great affinity for water. The final product is orthophosphoric acid.

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

Basicity of orthophosphoric acid is [1991]

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

It is a tribasic acid all the three hydrogen atoms are ionisable. It forms three series of salts.

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

PCl3 reacts with water to form [1991]

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

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

PH4I + NaOH forms [1991]

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

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

Pure nitrogen is prepared in the laboratory by heating a mixture of [1991]

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

Pure nitrogen in the lab can be obtained by heating ammonium nitrate. Ammonium nitrate is not a stable compound it dissociate to give nitrogen.

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

Which one of the following substance is used in the laboratory for fast drying of neutral gases?[1992]

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

Phosphorus pentoxide has great affinity for water. It forms ortho phosphoric acid on absorbing water

It is thus used as a powerful dehydrating or drying agent.

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

Number of electrons shared in the formation of nitrogen molecule is [1992]

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

Nitrogen molecule is diatomic containing a triple bond between two N atoms,
Therefore, nitrogen molecule is formed by sharing six electrons.

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

Sugarcane on reaction with nitric acid gives

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

Cane sugar is oxidised to oxalic acid

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

Nitrogen is relatively in active element because [1992]

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

N2 molecule contains triple bond between N atoms having very high dissociation energy (946 kJ mol–1) due to which it is relatively inactive.

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

H3PO2 is the molecular formula of an acid of phosphorus. Its name and basicity respectively are[1992]

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

Hypophosphorous acid (HPA), or phosphinic acid, is a phosphorus oxyacid and a powerful reducing agent with molecular formula H3PO2. As it contains only one P-OH group, its basicity is one.

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

When chlorine is passed over dry slaked lime at room temperature, the main reaction product is

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

 

chloride reacts with dry slaked lime to form bleaching power.

the actual composition of bleaching power is

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

 In the manufacture of bromine from sea water, the mother liquor containing bromides is treated with[1992]

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

Bromide in the mother liquor is oxidised to Br2 by Cl2 which is a stronger oxidising agent. 

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

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

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

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 - Question 32

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 - Question 32

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​

31 Year NEET Previous Year Questions: The p-Block Elements - Question 33

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 - Question 33

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 - Question 34

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

Detailed Solution for 31 Year NEET Previous Year Questions: The p-Block Elements - Question 34

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 - Question 35

Which of the following statements is false ? [1994]

Detailed Solution for 31 Year NEET Previous Year Questions: The p-Block Elements - Question 35

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

31 Year NEET Previous Year Questions: The p-Block Elements - Question 36

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

Detailed Solution for 31 Year NEET Previous Year Questions: The p-Block Elements - Question 36

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 - Question 37

Which among the following is paramagnetic ? [1994]

Detailed Solution for 31 Year NEET Previous Year Questions: The p-Block Elements - Question 37

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 - Question 38

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 - Question 38

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

31 Year NEET Previous Year Questions: The p-Block Elements - Question 39

The formula for calcium chlorite is [1994]

Detailed Solution for 31 Year NEET Previous Year Questions: The p-Block Elements - Question 39

Calcium chlorite is Ca (ClO2)2

31 Year NEET Previous Year Questions: The p-Block Elements - Question 40

Polyanion formation is maximum in [1994]

Detailed Solution for 31 Year NEET Previous Year Questions: The p-Block Elements - Question 40

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 - Question 41

The acid which has a peroxy linkage is [1994]

Detailed Solution for 31 Year NEET Previous Year Questions: The p-Block Elements - Question 41

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 - Question 42

Brown ring test is used to detect [1994]

Detailed Solution for 31 Year NEET Previous Year Questions: The p-Block Elements - Question 42

Brown ring test is done for confirmation of

31 Year NEET Previous Year Questions: The p-Block Elements - Question 43

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 - Question 43

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 - Question 44

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

Detailed Solution for 31 Year NEET Previous Year Questions: The p-Block Elements - Question 44

Thus in this reaction sulphur (S) is produced.

31 Year NEET Previous Year Questions: The p-Block Elements - Question 45

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 - Question 45

31 Year NEET Previous Year Questions: The p-Block Elements - Question 46

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

Detailed Solution for 31 Year NEET Previous Year Questions: The p-Block Elements - Question 46

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 - Question 47

Oxidation of thiosulphate by iodine gives [1996]

Detailed Solution for 31 Year NEET Previous Year Questions: The p-Block Elements - Question 47

31 Year NEET Previous Year Questions: The p-Block Elements - Question 48

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 - Question 48

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 - Question 49

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

Detailed Solution for 31 Year NEET Previous Year Questions: The p-Block Elements - Question 49

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

31 Year NEET Previous Year Questions: The p-Block Elements - Question 50

 The structural formula of hypophosphorous acid is

Detailed Solution for 31 Year NEET Previous Year Questions: The p-Block Elements - Question 50

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 - Question 51

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 - Question 51

Due to absence of reaction between marble and bromine

31 Year NEET Previous Year Questions: The p-Block Elements - Question 52

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 - Question 52

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 - Question 53

During its reactions, ozone [1999]

Detailed Solution for 31 Year NEET Previous Year Questions: The p-Block Elements - Question 53

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 - Question 54

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 - Question 54

31 Year NEET Previous Year Questions: The p-Block Elements - Question 55

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 - Question 55

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 - Question 56

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 - Question 56

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 - Question 57

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

Detailed Solution for 31 Year NEET Previous Year Questions: The p-Block Elements - Question 57

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 - Question 58

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 - Question 58

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 - Question 59

The correct order of acid strength is: [2005]

Detailed Solution for 31 Year NEET Previous Year Questions: The p-Block Elements - Question 59

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 - Question 60

Which of the following is the most basic oxide?

Detailed Solution for 31 Year NEET Previous Year Questions: The p-Block Elements - Question 60

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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