NEET Chemistry Chapter Wise Mock Test – p-Block Elements

NEET Chemistry Chapter Wise Mock Test – p-Block Elements

Question 1.
Which of the following compound is tribasic acid?
(a) H₃PO₂
(b) H₃PO₃
(c) H₃PO₄
(d) H₄P₂O₇

Question 2.
Among the members of VA group (N, P, As, Sb and Bi), which of the following properties shows an increase as we go down from nitrogen to bismuth?
(a) lectronegativity
(b) Acidic nature of the pentoxide
(c) Stability of -3 oxidation state
(d) Reducing character of hydrides

Question 3.
Which is the most thermodynamically stable allotropic form of phosphorus?
(a) Red
(b) Yellow
(c) White
(d) Black

Question 4.
Which of the following is not known?
(a) NI₃
(b) NCl₃
(c) NCl₅
(d) SbCl₃

Question 5.
The following are some statements related to VA group hydrides,
I. Reducing property increases from NH₃ to BiH₃.
II. Tendency to donate lone pair decreases from NH₃ to BiH₃.
III. Thermal stability of hydrides decreases from NH₃ to BiH₃.
IV. Bond angle of hydrides decreases form NH₃ to BiH₃.
The correct statements are
(a) I, II, III and IV
(b) I, III and IV
(c) I, II and IV
(d) I and IV

Question 6.
A black compound of manganese reacts with a halogen acid to give greenish yellow gas. When excess of this gas reacts with NH₃ an unstable trihalide is formed. in this process the oxidation state of nitrogen changes from
(a) -3 to +3
(b) -3 to 0
(c) -3 to +5
(d) 0 to -3

Question 7.
Elements of group -15 form compounds in +5 oxidation state. However, bismuth forms only one well characterised compound in +5 oxidation state. The compound is
(a) Bi₂O₅
(b) BiF₅
(c) BiCl₅
(d)Bi₂S₅

Question 8.
As the number of —OH groups increases in hypophosphorous acid, orthophosphorus acid and orthophosphoric acid, the acidic strength
(a) increases
(b) decreases
(c) remains nearly same
(d) remains appropriately same

Question 9.
Which of the following is the most explosive?
(a) NCl₃
(b) PCl₃
(c) AsCl₃
(d) All of these

Question 10.
In qualitative analysis, when H₂S is passed through an aqueous solution of salt acidified with dil. HCl, a black precipitate is obtained. On boiling the precipitate with dil. HNO₃, it forms a solution of blue colour. Addition of excess of aqueous solution of ammonia to this solution gives
(a) deep blue precipitate of Cu(OH)₂
(b) deep blue solution of [Cu(NH₃)₄]²⁺
(c) deep blue solution of Cu (NO₃)₂
(d) deep blue solution of Cu(OH)₂ Cu(NO₃)₂

Question 11.
Sodium pyrophosphate is represented by which of the following formula?
(a) Na₂ P₂O₄
(b) Na₄P₂O₅
(c) Na₄P₂O₇
(d) Na₂P₂O₅

Question 12.
In solid state,PCl₅is a
(a) covalent solid
(b) octahedral structure
(c) ionic solid with [PCl₆]⁺ octahedral and [PCI₄]⁺ tetrahedral
(d) ionic solid with [PCl₄]⁺ tetrahedral and [PCl₆]^– octahedral

Question 13.
On heating lead (II) nitrate gives a brown gas A. The gas A on cooling changes to colourless solid B. Solid B on heating with NO changes to a blue solid C. Identify C.
(a) NO₂
(b) N₂O₄
(c) N₂O₅
(d) N₂O₃

Question 14.
On heating compound (A) gives a gas (B) which is a constituent of air. This gas when treated with 3 moles of hydrogen (H₂) in the presence of a catalyst gives another gas (C) which is basic in nature. Gas (C) on further oxidation in moist condition gives a compound (D) which is a part of acid rain. Identify compound (D).
(a) HNO₂
(b) HNO₃
(c) H₂SO₄
(d) HCl

Question 15.
The substance used in Holme’s signals of the ship is a mixture of
(a) CaC₂ + Ca₃P₂
(b) Ca₃(PO₄)₂ + Pb₃O₄
(c) H₃PO₄ + CaCl₂
(d) NH₃ + HOCl

Question 16.
Which of the following are peroxoacids of sulphur?
(a) H₂SO₅ and H₂S₂O₈
(b) H₂SO5 and H₂S₂O₇
(c) H₂S₂O₇ and H₂S₂O₈
(d) H₂S₂O₆ and H₂S₂O₇

Question 17.
Which of the following salt would give SO₂ with hot and dil. H₂SO₄ and also decolourises Br₂ water?
(a) Na₂SO₃
(b) NaHSO₄
(c) Na₂SO₄
(d) Na₂S

Question 18.
Which one of the following oxides is expected to exhibit paramagnetic behaviour?
(a) CO₂
(b) SO₂
(c) ClO₂
(d) SiO₂

Question 19.
Which of the following attacks glass?
(a) HCl
(b) HF
(c) HI
(d) HBr

Question 20.
F₂ formed by reacting K₂MnF₆ with
(a) SbF₅
(b) MnF₃
(c) KSbF₆
(d) MnF₄

Question 21.
In the manufacture of bromine from sea water, the mother liquor containing bromides is treated with
(a) I₂
(b) Cl₂
(c) CO₂
(d) SO₂

Question 22.
Which of the following statement is not true?
(a) HF is stronger acid than HCl
(b) Among halide ions, iodide is the most powerful reducing agent
(c) Fluorine is the only halogen that does not show a variable oxidation state
(d) HOCl is a stronger acid than HOBr

Question 23.
The correct order of acidic strength is
(a) CO₂ > N₂O₅ > SO₃
(b) Cl₂O₇ > SO₂ > P₄O₁₀
(c) Na₂O > MgO > Al₂O₃
(d) K₂ > CaO > MgO

Question 24.
Which one of the following is a pseudo halide?
(a) I₃^–
(b) IF^–
(c) ICl
(d) CN^–

Question 25.
What is the oxidising agent in chlorine water?
(a) HCl
(b) HClO₂
(c) HOCl
(d) None of these

Question 26.
Which of the following halides is least stable and has doubtful existence?
(a) Cl₄
(b) SnI₄
(c) PbI₄
(d) GeI₄

Question 27.
Reduction potentials of some ions are given below.
Arrange them in decreasing order of oxidising power.

Question 28.
In Fischer Ringe’s method of separation of noble gas mixture from air is used
(a) 90% CaC₂ + 10%CaCl₂
(b) coconut charcoal
(c) sodalime + potash solution
(d) 90% CaCO₃ + 10% urea

Question 29.
The charcoal maintained at 100°C absorbs
(a) Ne and Kr
(b) Ar, Kr, Xe
(c) He and Ar
(d) He and Ne

Question 30.
In Ramsay and Rayleigh’s isolation of noble gases from air, the nitrogen of the air is finally converted into
(a) Only NaNO₂
(b) NO and NO₂
(c) Only NaNO₃
(d) NaNO₂ and NaNO₃

Question 31.
Xenon hexafluoride reacts with silica to form a xenon compound X. The oxidation state of xenon in Xe is
(a) +2
(b) +4
(c) +6
(d) 0

Question 32.
Which of the following is not obtained by direct reaction of constituent elements?
(a) XeO₃
(b) XeF₂
(c) XeF₆
(d) XeF₄

Question 33.
Which of the following gas mixture is used by the divers inside the sea?
(a) O₂ + He
(b) O₂ + Xe
(c) O₂ + Ar
(d) O₂ + N₂

Question 34.
Which one of the following reaction of xenon compounds is not feasible?
(a) XeO₃ + 6HF ——-> XeF₆ + 3H₂O
(b) 3XeF₄ + 6H₂O ———-> 2Xe + XeO₃ + 12HF + 1.5O₂
(c) 2XeF₂ + 2H₂O ———> 2Xe + 4HF + O₂
(d) XeF₆ + RbF —–> Rb[XeF₇]

Question 35.
Which among the following statements are correct?
I. Carbon monoxide is neutral where as SO₃ is acidic.
II. Potassium oxide is basic whereas nitrous oxide is acidic.
III. Aluminium and zinc oxides are amphoteric.
IV. Sulphur trioxide is acidic whereas phosphorus pentoxide is basic.
(a) (II) and (V)
(b) (I) and (IV)
(c) (I) and (III)
(d) (II) and (IV)

Question 36.

Question 37.
Noble gases are sparingly soluble in water due to
(a) dipole-dipole interaction
(b) dipole-induced dipole interaction
(c) induced dipole-induced dipole interaction
(d) hydrogen bonding

Direction (Q.Nos.38-39): In the following questions more than one of the answers given may be correct. Select the correct answer and mark it according to the codes.
Codes
(a) 1,2 and 3 are correct
(b) 1 and 2 are correct
(c) 2 and 4 are correct
(d) 1 and 3 are correct

Question 38.
White phosphorus has
1. six P—P single bonds
2. four lone pairs of electrons
3. P—P—P angle of 60°
4. four P—P single bonds

Question 39.
Which of the following can act as a Lewis base?
1. NCl₃
2. PCl₃
3. NBr₃
4. SbCl₃

Question 40.

Question 41.

Direction (Q. Nos. 42-47): Each of these questions contains two statements : Assertion and Reason. Each of these questions also has four alternative choices, only one of which is the correct answer. You have to select one of the codes (a), (b), (c) and (d) given below.
(a) Assertion is true, Reason is true; Reason is the correct explanation for Assertion
(b) Assertion is true, Reason is true; Reason is not the correct explanation for Assertion
(c) Assertion is true, Reason is false
(d) Assertion is false, Reason is true

Question 42.
Assertion: Among chalcogens, tendency of catenation is maximum for sulphur.
Reason: S—S bond dissociation energy is higher than O—O bond dissociation energy.

Question 43.
Assertion: White phosphorus is stored under water.
Reason: White phosphorus is highly reactive and catches fire spontaneously in air.

Question 44.
Assertion: F—F bond in F₂ molecule is strong.
Reason: F-atom is small in size.

Question 45.
Assertion: OF₂ is named as oxygen difluoride.
Reason: In OF₂, oxygen is less electronegative than fluorine.

Question 46.
Assertion: F₂ has high reactivity.
Reason: F—F bond has low bond dissociation enthalpy.

Question 47.
Assertion: Noble gases have positive electron affinity.
Reason: Noble gases have stable closed shell electronic configuration

Question 48.
Which is the strongest acid in the following?
(a) HClO₃
(b) HClO₄
(c) H₂SO₃
(d) H₂SO₄

Question 49.
Which of the following does not give oxygen on heating?
(a) Zn(ClO₃)₂
(b) K₂Cr₂O₇
(c) (NH₄)₂Cr₂O₇
(d) KCl03

Question 50.
Which of the following is polar molecule?
(a) SF₄
(b) SiF₄
(c) XeF₄
(d) BF₃

Question 51.
XeF₂ is isostructural with
(a) ICl₂
(b) SbCl₃
(c) BaCl₂
(d) TeF₂

Question 52.
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
(c) All oxoacids contain tetrahedral four coordinated phosphorus
(d) All oxoacids contain at least oneP = O unit and one P—OH group

Question 53.
Sulphur trioxide can be obtained by which of the following reaction?

Question 54.
Which of the following dissolves in water but does not give any oxyacid solution?
(a) SO₂
(b) OF₂
(c) SCl₄
(d) SO₃

Question 55.
Correct order of decreasing thermal stability is as
(a) NH₃ > PH₃ > AsH₃ > SbH₃
(b) PH₃ > NH₃ > AsH₃ > SbH₃
(c) AsH₃ > PH₃ > NH₃ > SbH₃
(d) SbH₃ > AsH₃ > PH₃> NH₃

Question 56.
The number of S—S bonds in sulphur trioxide trimer (S₃O₉) is
(a) 0
(b) 1
(c) 2
(d) 3

Question 57.
Which one of the following is present as an active powder for bleaching action?
(a) Ca(OCl)₂
(b) CaO₂Cl
(c) CaCl₂
(d) CaOCl₂

Question 58.
When cone. H₂SO₄ is heated with P₂O₅, the acid is coaverted into
(a) sulphur trioxide
(b) sulphur dioxide
(c) sulphur
(d) a mixture of sulphur dioxide and sulphur trioxide

Question 59.
Which of the following is not a peroxy acid?
(a) Perphosphoric acid
(b) Pernitric acid
(c) Perdisulphuric acid
(d) Perchloric acid

Question 60.
The tendency of BF₃, BCl₃ and BBr₃ to behave as Lewis acid decreases in the sequence
(a) BCl₃ > BF₃ > BBr₃
(b) BBr₃ > BCl₃ > BF₃
(c) BBr₃ > BF₃ > BCl₃
(d) BF₃ > BCl₃ > BBr₃

Question 61.
Bromine water reacts with SO₂ to form
(a) HBr and S
(b) H₂O and HBr
(c) S and H₂O
(d) H₂SO₄ and HBr

Question 62.
Ammonia, on reaction with excess of chlorine, gives
(a) NCl₃ and HCl
(b) N₄ and NH₄Cl
(c) NCl₃ and NH₄Cl
(d) N₂ and HCl

Question 63.
Consider the sequence of oxides : Na₂O, SiO₂, P₄O₁₀.
Which factor decreases from Na₂O to SiO₂ and also from SiO₂ to P₄O₁₀?
(a) Covalent character
(b) Melting point
(c) p^H when mixed with water
(d) Solubility in aqueous alkali

Question 64.
The type of hybrid orbitals used by iodine atom in hypoiodous acid molecule are
(a) sp³
(b) sp²
(c) sp
(d) sp³d

Answers:

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