NEET Chemistry Chapter Wise Mock Test – p-Block Elements
Which of the following compound is tribasic acid?
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?
(b) Acidic nature of the pentoxide
(c) Stability of -3 oxidation state
(d) Reducing character of hydrides
Which is the most thermodynamically stable allotropic form of phosphorus?
Which of the following is not known?
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
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
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
As the number of —OH groups increases in hypophosphorous acid, orthophosphorus acid and orthophosphoric acid, the acidic strength
(c) remains nearly same
(d) remains appropriately same
Which of the following is the most explosive?
(d) All of these
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
Sodium pyrophosphate is represented by which of the following formula?
(a) Na2 P2O4
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
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.
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).
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
Which of the following are peroxoacids of sulphur?
(a) H2SO5 and H2S2O8
(b) H2SO5 and H2S2O7
(c) H2S2O7 and H2S2O8
(d) H2S2O6 and H2S2O7
Which of the following salt would give SO2 with hot and dil. H2SO4 and also decolourises Br2 water?
Which one of the following oxides is expected to exhibit paramagnetic behaviour?
Which of the following attacks glass?
F2 formed by reacting K2MnF6 with
In the manufacture of bromine from sea water, the mother liquor containing bromides is treated with
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
The correct order of acidic strength is
(a) CO2 > N2O5 > SO3
(b) Cl2O7 > SO2 > P4O10
(c) Na2O > MgO > Al2O3
(d) K2 > CaO > MgO
Which one of the following is a pseudo halide?
What is the oxidising agent in chlorine water?
(d) None of these
Which of the following halides is least stable and has doubtful existence?
Reduction potentials of some ions are given below.
Arrange them in decreasing order of oxidising power.
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
The charcoal maintained at 100°C absorbs
(a) Ne and Kr
(b) Ar, Kr, Xe
(c) He and Ar
(d) He and Ne
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
Xenon hexafluoride reacts with silica to form a xenon compound X. The oxidation state of xenon in Xe is
Which of the following is not obtained by direct reaction of constituent elements?
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
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]
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)
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.
(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
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
Which of the following can act as a Lewis base?
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
Assertion: Among chalcogens, tendency of catenation is maximum for sulphur.
Reason: S—S bond dissociation energy is higher than O—O bond dissociation energy.
Assertion: White phosphorus is stored under water.
Reason: White phosphorus is highly reactive and catches fire spontaneously in air.
Assertion: F—F bond in F2 molecule is strong.
Reason: F-atom is small in size.
Assertion: OF2 is named as oxygen difluoride.
Reason: In OF2, oxygen is less electronegative than fluorine.
Assertion: F2 has high reactivity.
Reason: F—F bond has low bond dissociation enthalpy.
Assertion: Noble gases have positive electron affinity.
Reason: Noble gases have stable closed shell electronic configuration
Which is the strongest acid in the following?
Which of the following does not give oxygen on heating?
Which of the following is polar molecule?
XeF2 is isostructural with
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
Sulphur trioxide can be obtained by which of the following reaction?
Which of the following dissolves in water but does not give any oxyacid solution?
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
The number of S—S bonds in sulphur trioxide trimer (S3O9) is
Which one of the following is present as an active powder for bleaching action?
When cone. H2SO4 is heated with P2O5, the acid is coaverted into
(a) sulphur trioxide
(b) sulphur dioxide
(d) a mixture of sulphur dioxide and sulphur trioxide
Which of the following is not a peroxy acid?
(a) Perphosphoric acid
(b) Pernitric acid
(c) Perdisulphuric acid
(d) Perchloric acid
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
Bromine water reacts with SO2 to form
(a) HBr and S
(b) H2O and HBr
(c) S and H2O
(d) H2SO4 and HBr
Ammonia, on reaction with excess of chlorine, gives
(a) NCl3 and HCl
(b) N4 and NH4Cl
(c) NCl3 and NH4Cl
(d) N2 and HCl
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) pH when mixed with water
(d) Solubility in aqueous alkali
The type of hybrid orbitals used by iodine atom in hypoiodous acid molecule are
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