P-Block Elements NEET Questions

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P Block Elements Chemistry NEET Practice Questions

1 / 47

Which of the following substances is used in the laboratory for fast-drying neutral gases?

(b) Active charcoal

(a) Phosphorus pentoxide

(d) Na₃PO₄

2 / 47

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

(a) PH₃

(d) HPO₃

(b) P₂O₅

3 / 47

Basicity of orthophosphoric acid is

(a) 2

(b) 3

(d) 5

4 / 47

Which is the correct statement for the given acids?

(a) Phosphinic acid is a monoprotic acid while phosphonic acid is a diprotic acid.

(d) Both are triprotic acids

(b) Phosphinic acid is a diprotic acid while phosphonic acid is a monoprotic acid.

5 / 47

Zn gives H₂ gas with H₂SO₄ and HCl but not with HNO₃ because

(d) NO₃^– is reduced in preference to hydronium ion.

(a) Zn act as an oxidizing agent when reacting with HNO₃

(b) HNO₃ is weaker acid than H₂SO4 and HCl

6 / 47

Which of the following fluorides does not exist?

(b) PF₅

(a) NF₅

(d) SbF₅

7 / 47

PCl₃ reacts with water to form

(b) H₃PO₃, HCl

(d) H₃PO₄

(a) PH₃

8 / 47

Among the following oxides, the lowest acidic is

(b) As₄O₁₀

(d) P₄O₁₀

(a) As₄O₆

9 / 47

Nitrogen forms N₂, but phosphorus does not form P₂, however, it converts P₄, reason is

(d) multiple bonds form easily

(a) triple bond present between phosphorus atom

(b) pp – pp bonding is weak

10 / 47

Oxygen will directly react with each of the following elements except

(b) Cl

(d) S

(a) P

11 / 47

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

(a) Orthophosphoric acid is used in the manufacture of triple superphosphate.

(b) Hypophosphorous acid is a diprotic acid.

(d) All oxoacids contain at least one P O unit and one P—OH group

12 / 47

When copper is heated with conc. HNO₃ it produces

(d) Cu(NO₃)₂ and NO

(b) Cu(NO₃)₂ and N₂O

(a) Cu(NO₃)₂, NO and NO₂

13 / 47

P₂O₅ is heated with water to give

(b) phosphorous acid

(a) hypophosphorous acid

(d) orthophosphoric acid.

14 / 47

Which one has the lowest boiling point?

(b) PH₃

(d) SbH₃

(a) NH₃

15 / 47

Strong reducing behavior of H₃PO₂ is due to

(a) high electron gain enthalpy of phosphorus

(d) presence of one —OH group and two P—H bonds.

(b) the high oxidation state of phosphorus

16 / 47

Aqueous solution of ammonia consists of

(d) NH₄+ and OH^–

(a) H⁺

(b) OH^–

17 / 47

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

(a) NH₄OH + NaCl

(d) NH₄Cl + NaNO₂

(b) NH₄NO₃ + NaCl

18 / 47

Which is the correct thermal stability order for H₂E (E = O, S, Se, Te and Po) ?

(d) H₂Po < H₂Te < H₂Se < H₂S < H₂O

(b) H₂S < H₂O < H₂Se < H₂Te < H₂Po

(a) H₂Se < H₂Te < H₂Po < H₂O < H₂S

19 / 47

Which of the following is a Nitric Acid anhydride?

(d) N₂O₃

(b) NO₂

(a) NO

20 / 47

Sugarcane on reaction with nitric acid gives

(b) (COOH)₂

(a) CO₂ and SO₂

(d) no reaction.

21 / 47

Which of the following oxides of nitrogen is paramagnetic?

(a) NO₂

(b) N₂O₃

(d) N₂O₅

22 / 47

Nitrogen is a relatively inactive element because

(a) its atom has a stable electronic configuration

(b) it has a low atomic radius

(d) the dissociation energy of its molecule is fairly high.

23 / 47

Number of electrons shared in the formation of nitrogen molecule is

(b) 10

(a) 6

(d) 8

24 / 47

Which of the following does not give oxygen on heating?

(d) Zn(ClO₃)₂

(b) (NH₄)₂Cr₂O₇

(a) K₂Cr₂O₇

25 / 47

Which of the following bonds has the highest energy?

(b) O–O

(a) S–S

(d) Te–Te

26 / 47

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

(a) phosphorous acid and two

(b) hypophosphorous acid and two

(d) hypophosphoric acid and two.

27 / 47

Which of the following does not give oxygen on heating?

(a) K₂Cr₂O₇

(b) (NH₄)₂Cr₂O₇

(d) Zn(ClO₃)₂

28 / 47

The basic character of hydrides of the group V elements decreases in the order

(a) NH₃ > PH₃ > AsH₃ > SbH₃

(d) NH₃ > SbH₃ > PH₃ > AsH₃

(b) SbH₃ > AsH₃ > PH₃ > NH₃

29 / 47

Which would quickly absorb oxygen?

(d) Alkaline solution of CuSO₄

(a) Alkaline solution of pyrogallol

(b) Conc. H₂SO₄

30 / 47

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

(b) oxygen is more reactive than nitrogen

(d) oxygen has a lower density than nitrogen.

(a) oxygen is in a different group of the periodic table from nitrogen

31 / 47

How many bridging oxygen atoms are present in P₄O₁₀?

(d) 5

(a) 6

(b) 4

32 / 47

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

(b) oxygen is more reactive than nitrogen

(d) oxygen has a lower density than nitrogen.

(a) oxygen is in a different group of the periodic table from nitrogen

33 / 47

Which of the following statement is not correct for nitrogen?

(d) Its molecular size is small.

(a) Its electronegativity is very high

(b) d-orbitals are available for bonding.

34 / 47

Which of the following oxoacids of phosphorus has strongest reducing property?

(a) H₄P₂O₇

(b) H₃PO₃

(d) H₃PO₄

35 / 47

A compound ‘X’ upon reaction with H₂O produces a colorless gas ‘Y’ with a rotten fish smell. Gas ‘Y’ is absorbed in a solution of CuSO₄ to give Cu₃P₂ as one of the products. Predict the compound ‘X’.

(b) NH₄Cl

(a) Ca₃P₂

(d) Ca₃(PO₄)2

36 / 47

Urea reacts with water to form A which will decompose to form B. B when passed through Cu²⁺ (aq), deep blue colour solution C is formed. What is the formula of C from the following?

(b) [Cu(NH₃)₄]²⁺

(d) CuCO₃·Cu(OH)₂

(a) CuSO₄

37 / 47

Acidity of diprotic acids in aqueous solutions increases in the order

(d) H₂Se < H₂Te < H₂S

(a) H₂S < H₂Se < H₂Te

(b) H₂Se < H₂S < H₂Te

38 / 47

Each of the following is true for white and red phosphorus except that they

(d) can be converted into one another.

(a) are both soluble in CS₂

(b) can be oxidized by heating in air

39 / 47

. Which of the following oxides is most acidic?

(a) As₂O₅

(b) P₂O₅

(d) Sb₂O₅

40 / 47

Oxidation states of P in H₄P₂O₅, H₄P₂O₆, H₄P₂O₇ are respectively

(b) +5, +3, +4

(a) +3, +5, +4

(d) +3, +4, +5

41 / 47

Which of the following phosphorus is the most reactive?

(a) Scarlet phosphorus

(b) White phosphorus

(d) Violet phosphorus

42 / 47

Which of the following has the highest dipole moment?

(a) SbH₃

(d) PH₃

(b) AsH₃

43 / 47

Which of the following does not give oxygen on heating?

(b) (NH₄)₂Cr₂O₇

(d) Zn(ClO₃)₂

(a) K₂Cr₂O₇

44 / 47

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

(a) N₂H₄

(b) NH₃

(d) NH₂OH

45 / 47

Identify the incorrect statement related to PCl₅ from the following:

(d) Axial P – Cl bonds are longer than equatorial P – Cl bonds.

(b) Three equatorial P – Cl bonds make an angle of 120° with each other.

(a) PCl₅ molecule is non-reactive.

46 / 47

PH₄I + NaOH forms

(d) P₄O₁₀

(b) NH₃

(a) PH₃

47 / 47

Oxygen will directly react with each of the following elements except

(a) P

(b) Cl

(d) S

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P-Block Elements NEET Questions

Class XI Chemistry NEET Practice Questions

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Some Basic Concepts of Chemistry

Structure of Atom

Classification of Elements and Periodicity in Properties

Chemical Bonding and Molecular Structure

States of Matter

Thermodynamics

Equilibrium

Redox Reactions

Hydrogen

Hydrocarbons

The s – Block Elements

Environmental Chemistry

The p – Block Elements

Organic Chemistry- Some Basic Principles and Techniques

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The Solid State

Solutions

Chemical Kinetics

Surface Chemistry

General Principles and Processes of Isolation of Elements

The p – Block Elements

The d – and f – Block Elements

Coordination Compounds

Haloalkanes and Haloarenes

Amines

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Carboxylic Acids

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