P Block Elements

01

PYQ 2017

medium

chemistry ID: mht-cet-

In preparation of sulphuric acid from sulphur dioxide in lead chamber process. What substance is used as a catalyst ?

1

Manganese dioxide

2

Vanadium pentoxide

3

Nitric oxide

4

Raney Nickel

02

PYQ 2017

medium

chemistry ID: mht-cet-

Which among the following compounds does not act as a reducing agent ?

1

2

3

4

03

PYQ 2017

medium

chemistry ID: mht-cet-

Which halogen has the highest value of negative electron gain enthalpy ?

1

Fluorine

2

Chlorine

3

Bromine

4

Iodine

04

PYQ 2017

medium

chemistry ID: mht-cet-

What is the chief constituent of Pyrex glass ?

1

2

3

4

05

PYQ 2018

medium

chemistry ID: mht-cet-

Excess of ammonia with sodium hypochloride solution in the presence of glue or gelatin gives

1

2

3

4

06

PYQ 2018

medium

chemistry ID: mht-cet-

Which among the following oxoacids of phosphorus shows a tendency of disproportionation?

1

Phosphinic acid

2

Orthophosphoric acid

3

Phosphonic acid

4

Pyrophosphoric acid

07

PYQ 2018

medium

chemistry ID: mht-cet-

Which among the group-15 elements does NOT exists as tetra atomic molecule?

1

Nitrogen

2

Phosphorus

3

Arsenic

4

Antimony

08

PYQ 2018

medium

chemistry ID: mht-cet-

What is the catalyst used for oxidation of to in lead chamber process for manufacture of sulphuric acid?

1

Nitric oxide

2

Nitrous oxide

3

Potassium iodide

4

Dilute HCl

09

PYQ 2019

medium

chemistry ID: mht-cet-

In which oxidation state, group elements act as Lewis base?

1

2

3

4

10

PYQ 2019

medium

chemistry ID: mht-cet-

Which of the following is also called as nitrogen sesquioxide?

1

2

3

4

11

PYQ 2020

medium

chemistry ID: mht-cet-

What is the molecular formula of nitrogen sesquioxide?

1

N O

2

N O

3

N O

4

N O

12

PYQ 2020

medium

chemistry ID: mht-cet-

Identify the catalyst X used in the following reaction: CH CH Br + 2[H] CH CH + HBr

1

CaO,

2

Zn-Cu couple in alcohol

3

KMnO

4

K Cr O

13

PYQ 2020

medium

chemistry ID: mht-cet-

Which among the following oxides of nitrogen is a brown coloured gas?

1

2

3

4

14

PYQ 2020

medium

chemistry ID: mht-cet-

Which of the following halogens combine with dihydrogen at the lowest temperature?

1

Iodine

2

Fluorine

3

Bromine

4

Chlorine

15

PYQ 2020

medium

chemistry ID: mht-cet-

The most basic hydride of group 15 elements is

1

NH

2

PH

3

SbH

4

AsH

16

PYQ 2020

medium

chemistry ID: mht-cet-

Which among the following elements has the highest ionisation enthalpy and bears a diagonal relationship with aluminium?

1

Magnesium

2

Beryllium

3

Calcium

4

Lithium

17

PYQ 2020

medium

chemistry ID: mht-cet-

The units nanometer and picometer are related as,

1

2

3

4

18

PYQ 2020

medium

chemistry ID: mht-cet-

Which of the following oxyacid of chlorine has highest thermal stability?

1

2

3

4

19

PYQ 2020

medium

chemistry ID: mht-cet-

Which of the following formula represents laughing gas?

1

2

3

4

20

PYQ 2020

easy

chemistry ID: mht-cet-

$The P-P-P bond angle in white phosphorus is$

Official Solution

Correct Option: (1)

21

PYQ 2020

easy

chemistry ID: mht-cet-

$Which of the following oxyacid of sulfur contains S=S linkage?$

Official Solution

Correct Option: (1)

22

PYQ 2020

medium

chemistry ID: mht-cet-

$How many numbers of P-OH and P-O-P bonds are present in pyrophosphoric acid respectively?$

1

$3, 1$

2

$4, 1$

3

$4, 3$

4

$3, 3$

Official Solution

Correct Option: (2)

$Step 1: Structure of pyrophosphoric acid. Pyrophosphoric acid contains two phosphate groups (PO₄) joined by an oxygen atom. There are four P-OH bonds (one from each phosphate group) and one P-O-P bond (connecting the two phosphate groups). Step 2: Analyzing the options. (A) 3, 1: Incorrect — There are four P-OH bonds, not three. (B) 4, 1: Correct — There are four P-OH bonds and one P-O-P bond. (C) 4, 3: Incorrect — There is only one P-O-P bond. (D) 3, 3: Incorrect — There are four P-OH bonds, not three. Step 3: Conclusion. The correct answer is (B) 4, 1 .$

23

PYQ 2020

medium

chemistry ID: mht-cet-

$Which of the following formula represents lithium imide?$

1

2

3

4

Official Solution

Correct Option: (3)

$Step 1: Understanding lithium imide. Lithium imide consists of a lithium atom bonded to an imide group (). The correct formula is . Step 2: Analyzing the options. (A) : This is lithium nitride, not lithium imide. (B) : This is lithium amide, not imide. (C) : Correct — This is the formula for lithium imide. (D) : This is an incorrect formula for lithium imide. Step 3: Conclusion. The correct answer is (C) .$

24

PYQ 2020

medium

chemistry ID: mht-cet-

$Which of the following compounds does NOT contain >C=O group?$

1

$Ether$

2

$Ester$

3

$Amide$

4

$Acyl halide$

Official Solution

Correct Option: (1)

$Step 1: Identifying functional groups. The >C=O group is a carbonyl group, found in compounds like esters, amides, and acyl halides. Step 2: Analyzing the options. (A) Ether: Correct — Ether does not contain a carbonyl group (>C=O). (B) Ester: Esters contain a carbonyl group (RCOOR). (C) Amide: Amides contain a carbonyl group (RCONH₂). (D) Acyl halide: Acyl halides contain a carbonyl group (RCOCl). Step 3: Conclusion. The correct answer is (A) Ether, as it does not contain a carbonyl group.$

25

PYQ 2020

medium

chemistry ID: mht-cet-

$What is the lowest oxidation state possessed by phosphorus in its oxyacids?$

1

$+4$

2

$+2$

3

$+5$

4

$+1$

Official Solution

Correct Option: (4)

$Step 1: Understanding Oxidation States. Phosphorus can have various oxidation states in its oxyacids, ranging from +1 to +5. The lowest oxidation state of phosphorus is +1, as seen in hypophosphorous acid (H PO). Step 2: Analyzing the options. (A) +4: Incorrect. Phosphorus can have an oxidation state of +4 in acids like phosphoric acid (H PO), but this is not the lowest. (B) +2: Incorrect. This oxidation state does not correspond to phosphorus in any of its oxyacids. (C) +5: Incorrect. The +5 oxidation state of phosphorus is the highest, found in phosphoric acid. (D) +1: Correct. The lowest oxidation state of phosphorus in its oxyacids is +1, seen in hypophosphorous acid. Step 3: Conclusion. The lowest oxidation state of phosphorus in its oxyacids is +1, corresponding to option (D) .$

26

PYQ 2020

medium

chemistry ID: mht-cet-

$Which of the following oxyacid of sulphur contain both S=S and S=O bonds ?$

1

2

3

4

Official Solution

Correct Option: (4)

$Step 1: Structure of oxyacids of sulphur. Different oxyacids of sulphur show different bonding patterns involving sulphur-sulphur and sulphur-oxygen bonds. Step 2: Analysis of thiosulphuric acid. Thiosulphuric acid contains one sulphur atom bonded to another sulphur atom through an S=S bond and also contains S=O bonds. Step 3: Elimination of other options. Other given oxyacids do not simultaneously contain both S=S and S=O bonds. Step 4: Conclusion. Therefore, the correct answer is}.$

27

PYQ 2020

medium

chemistry ID: mht-cet-

$Which among the following is a polynuclear hydride?$

1

2

3

4

Official Solution

Correct Option: (1)

$Step 1: Understanding polynuclear hydrides. Polynuclear hydrides are hydrides that contain more than one metal atom in the structure. (diborane) is an example of a polynuclear hydride, containing two boron atoms. Step 2: Analyzing the options. (A) : Correct — This is a polynuclear hydride, as it contains two boron atoms. (B) : Incorrect. Lithium hydride is a simple hydride, not a polynuclear hydride. (C) : Incorrect. Ammonia is not a hydride but a nitrogen compound. (D) : Incorrect. Sodium hydride is a simple hydride, not a polynuclear hydride. Step 3: Conclusion. The correct answer is (A), which is a polynuclear hydride.$

28

PYQ 2020

medium

chemistry ID: mht-cet-

$Which among the following group -15 elements forms hydrogen bonding in its hydride compounds?$

1

$Sb$

2

$P$

3

$As$

4

$N$

Official Solution

Correct Option: (4)

$Step 1: Understanding the concept of hydrogen bonding. Hydrogen bonding occurs when a hydrogen atom, which is bonded to a highly electronegative element (such as nitrogen, oxygen, or fluorine), interacts with a lone pair of electrons on another electronegative atom. Step 2: Analyzing the options. (A) Sb: Antimony does not form hydrogen bonds in its hydride compounds. (B) P: Phosphorus also does not form strong hydrogen bonds in its hydride compounds. (C) As: Arsenic hydrides do not exhibit strong hydrogen bonding. (D) N: Nitrogen hydrides (like NH₃) form hydrogen bonds due to the high electronegativity of nitrogen and the presence of lone pairs. Step 3: Conclusion. The correct answer is (D) N, as nitrogen forms hydrogen bonding in its hydride compounds.$

29

PYQ 2020

medium

chemistry ID: mht-cet-

$Which of the following oxides is NOT volatile?$

1

2

3

4

Official Solution

Correct Option: (2)

$Step 1: Understand volatility. Volatile oxides easily vaporise on heating and are usually covalent in nature. Step 2: Analyze the oxides.,, and are covalent oxides and volatile. Step 3: Identify the exception. is an ionic oxide with high lattice energy and is non-volatile. Step 4: Conclusion. Therefore, zinc oxide is not volatile.$

30

PYQ 2020

medium

chemistry ID: mht-cet-

$Which among the following is a powerful bleaching and oxidising agent?$

1

2

3

4

Official Solution

Correct Option: (1)

$Step 1: Understand bleaching action. Bleaching agents remove colour by oxidation or reduction of coloured substances. Step 2: Nature of chlorine. Chlorine is a strong oxidising agent and bleaches by oxidation in the presence of moisture. Step 3: Eliminate other options. bleaches by reduction, while and are reducing agents. Step 4: Conclusion. Thus, chlorine is a powerful bleaching and oxidising agent.$

31

PYQ 2020

medium

chemistry ID: mht-cet-

$Identify the hydrocarbon compound from the following containing carbon atoms in the range of C to C ?$

1

$Waxes$

2

$Petrol$

3

$Diesel$

4

$CNG$

Official Solution

Correct Option: (2)

$Step 1: Understanding the compound. Petrol (gasoline) is a hydrocarbon compound that typically contains carbon atoms in the range of C to C, which makes it the correct answer. Step 2: Analyzing the options. (A) Waxes: Waxes generally contain longer carbon chains, more than C . (B) Petrol: Correct — Petrol is a mixture of hydrocarbons with carbon atoms in the range of C to C . (C) Diesel: Diesel fuel contains hydrocarbons in a slightly higher range, typically C to C . (D) CNG: CNG (compressed natural gas) mainly contains methane (CH), with smaller carbon numbers. Step 3: Conclusion. The correct answer is (B) Petrol .$

32

PYQ 2020

medium

chemistry ID: mht-cet-

$Which among the following halogen does not form polyhalide ion?$

1

$Cl$

2

$Br$

3

$I$

4

$F$

Official Solution

Correct Option: (4)

$Step 1: Understand polyhalide ions. Polyhalide ions are formed when a halide ion combines with a halogen molecule, for example: Step 2: Analyze halogens. Chlorine, bromine, and iodine can form polyhalide ions due to their larger atomic size and availability of vacant orbitals. Step 3: Reason for fluorine. Fluorine has very small size, very high electronegativity, and no vacant d-orbitals, so it does not form polyhalide ions. Step 4: Conclusion. Therefore, fluorine does not form polyhalide ions.$

33

PYQ 2020

medium

chemistry ID: mht-cet-

$Which of the following oxyacids of chlorine does not contain lone pair of electrons on chlorine atom?$

1

$HOClO$

2

$HOCl$

3

$HOClO$

4

$HOClO$

Official Solution

Correct Option: (3)

$Step 1: Understanding the structure of oxyacids. Oxyacids of chlorine consist of chlorine bonded to oxygen atoms, with hydrogen atoms also bonded to oxygen. The number of lone pairs on chlorine depends on the oxidation state of chlorine in the acid. Step 2: Analyzing the options. (A) HOClO : Chlorine in HOClO has lone pairs because chlorine has a low oxidation state. (B) HOCl: Chlorine in HOCl has lone pairs as chlorine is in a lower oxidation state. (C) HOClO : Chlorine in HOClO has no lone pairs, as chlorine is in a high oxidation state and forms bonds with three oxygens. (D) HOClO: Chlorine in HOClO has lone pairs as chlorine is in a low oxidation state. Step 3: Conclusion. The correct answer is (C) HOClO because chlorine does not have lone pairs in this acid.$

34

PYQ 2022

easy

chemistry ID: mht-cet-

$What is the quantity of sugar charcoal obtained when 34.2 g sugar is charred using required quantity of conc. sulphuric acid under ideal conditions?$

1

$14.4 g$

2

$11.0 g$

3

$114 g$

4

$10.5 g$

Official Solution

Correct Option: (1)

$When sugar (sucrose) is charred using concentrated sulfuric acid, it undergoes dehydration and forms carbon (charcoal) and water. The balanced chemical equation for this reaction is: C 12 H 22 O 11 (sugar) 12C (charcoal) + 11H 2 O (water) According to the equation, 1 mole of sugar (342 g) produces 12 moles of carbon (charcoal) and 11 moles of water.To find the quantity of charcoal obtained when 34.2 g of sugar is charred, Calculate the number of moles of sugar: Moles of sugar = Moles of sugar = Moles of sugar = 0.1 mol Since the molar ratio between sugar and charcoal is 1:12, we can determine the number of moles of charcoal produced: Moles of charcoal = Moles of sugar x Moles of charcoal = 0.1 mol x 12 Moles of charcoal = 1.2 mol Calculate the mass of charcoal obtained: Mass of charcoal = Moles of charcoal x Molar mass of charcoal Mass of charcoal = 1.2 mol x 12 g/mol Mass of charcoal = 14.4 g Therefore, when 34.2 g of sugar is charred, the quantity of charcoal obtained is 14.4 g$

35

PYQ 2023

easy

chemistry ID: mht-cet-

$Which of the following is the correct representation of Haber process?$

1

$Ammonia$

2

$Nitrates$

3

$Potash$

4

$Urea$

Official Solution

Correct Option: (1)

$The Haber process is an industrial method used for the synthesis of ammonia () from nitrogen () and hydrogen () gases. The reaction is exothermic and can be represented as: Key Elements of the Haber Process: Reactants: The reactants in the Haber process are nitrogen gas () and hydrogen gas (). Nitrogen is usually sourced from the air, and hydrogen is typically derived from natural gas (methane) through a process called steam reforming. Conditions: The reaction takes place under high temperature (around 450°C) and high pressure (150-300 atm), and is facilitated by an iron-based catalyst. The combination of these factors helps to increase the rate of reaction and the yield of ammonia. Catalyst: An iron catalyst is used to speed up the reaction. The catalyst provides an alternative pathway for the reaction, reducing the activation energy and enabling the reaction to occur more efficiently at a lower temperature. Exothermic Reaction: The Haber process is exothermic, meaning it releases heat. This is important for the energy balance of the process, as it helps to make the process more energy-efficient. However, controlling the temperature is crucial because higher temperatures favor the decomposition of ammonia, shifting the equilibrium towards the reactants. Industrial Importance: Ammonia produced through the Haber process is a key component in the production of fertilizers, especially nitrogen-based fertilizers like urea, ammonium nitrate, and ammonium sulfate. These fertilizers are vital for boosting agricultural productivity and ensuring food security globally. Additionally, ammonia is used in the manufacturing of explosives, plastics, and other chemicals.$

36

PYQ 2025

medium

chemistry ID: mht-cet-

$Which from following compounds can be obtained by azo coupling reaction.$

1

$Benzenediazonium chloride$

2

$Fluoroarene$

3

4

Official Solution

Correct Option: (3)

$Step 1: Concept Azo coupling is a reaction between a diazonium salt and an electron-rich aromatic compound (like phenol or aniline) to form an azo compound (). Step 2: Analysis - (A) is the reactant for coupling. - (B) is formed via the Balz-Schiemann reaction. - (C) is a classic orange dye formed when benzenediazonium chloride reacts with phenol in alkaline medium. Final Answer: (C)$

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Chapter Questions
36 MCQs

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P Block Elements

High-Yield Trend

Chapter Questions 36 MCQs

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Chapter Questions
36 MCQs