NEET Chemistry Chapter Wise Mock Test – The d- and f- Block Elements
Among the following series of transition metai ions, the one in which all metal ions have 3 d2– electronic configuration is
(Atomic number: Ti= 22, V= 23, Cr= 24, Mn= 25)
(a) Ti2+, V2+, Cr3+, Mn4+
(b) Ti+, V4+, Cr6+, Mn7+
(c) Ti4+, V3+, Cr2+, Mn3+
(d) Ti2+, V3+, Cr4+, Mn5+
Which one of the following ions is the most stable in aqueous solution?
(Atomic number: Ti = 22, V=23, Cr = 24, Mn = 25).
Which of the following element has maximum first ionisation potential?
Mercury is a liquid metal because
(a) it has a completely filled s-orbital
(b) it has a small atomic size
(c) it has a completely filled d-orbital that prevents d-d overlapping of orbitals
(d) it has a completely filled d-orbital that causes d-d overlapping
Which of the following compounds volatises on heating?
Among of the following outermost configurations of transition metals, which shows the highest oxidation state?
Of the following outer electronic configurations of atoms, the highest oxidation state is achieved by which one of them?
Among the following pair of ions, the lower oxidation state in aqueous solution is more stable then the order is
(a) V2+, VO2+
(b) Cr2+, Cr3+
(c) Ti+, Ti3+
(d) Cu+, Cu2+
Which oxide of manganese is amphoteric?
Which one of the following oxides is ionic?
The basic character of the transition metal monoxides follows the order
(a) TiO >VO>CrO>FeO
Which of the following is highly corrosive?
Which of the following is amphoteric oxide?
Mn2O7, CrO3, Cr2O3, CrO, V2O5, V2O4
(a) V2O5, Cr2O3
(b) Mn2O7, CrO3
(d) V2O5, V2O4
Paramagnetism is given by the relation μ= 2√[S(S +1)] magnetons where ‘S is the total spin. On the basis, the paramagnetism of Cu+ ion is
(a) 3.88 magnetons
(b) 2.83 magnetons
(c) 1.41 magnetons
Which of the following ions form most stable complex compound?
Among the following, compound that is both paramagnetic and coloured is
Amongst the following, the lowest degree of paramagnetism per mole of the compound at 298 K will be shown by
Which of the following has highest magnetic moment?
The spin only magnetic moment of Mn4+ ion is nearly
(a) 3 BM
(b) 6 BM
(c) 4 BM
(d) 5 BM
Amongst TiF2-6, CoF3-6, Cu2Cl2 and NiCl2-4, the colourless species are (atomic number Ti =22, Co = 27, Cu = 29, Ni = 28)
(a) CoF3-6 and NiCl2-4
(b) TiF2-6 and CoF3-6
(c) Cu2Cl2 and NiCl2-4
(d) TiF2-6 and Cu2Cl2
Cuprous ion is colourless, while cupric ion is coloured because
(a) both have half-filled p- and d-orbital
(b) cuprous ion has a complete d-orbital and cupric ion has incomplete d-orbital
(c) cuprous ion has incomplete d-orbital and cupric ion has a complete d-orbital
(d) both have unpaired electrons in d-orbital
The catalytic activity of the transition metals and their compounds is ascribed to their
(a) magnetic behaviour
(b) chemical reactivity
(c) unfilled d-orbitals
(d) ability to adopt multiple oxidation states and their complexing ability
Acidified potassium permanganate solution is decolourised by
(a) Bleaching power
(b) White vitriol
(c) Mohr’s salt
(d) Microcosmic salt
With K4[Fe(CN)6],Cu2+ ions give
(a) a blue ppt
(b) a bluish ppt
(c) a blood red ppt
(d) a reddish brown ppt
In the above reaction, X is
On igniting Fe2O3 at 1400°C, the product obtained is
(a) Fe2O3 melt
(d) metallic iron
Acidified solution of potassium dichromate on treatment with H2O2 yields
(a) CrO5 + H2O
(b) H2Cr2O7 + H2O + O2
(c) Cr2O3 + H2O + O2
(d) CrO3 + H2O + O2
Gadolinium belongs to 4f-series, atomic number is 64. Which of the following is the correct electronic configuration of gadolinium?
(a) [Xe] 4f75d16s2
(b) [Xe] 4f65d26s2
(c) [Xe] 4f86d2
(d) [Xe] 4f95s1
There are 14 elements in actinoid series. Which of the following elements does not belong to this series?
Which of the following trivalent ion has the largest atomic radii in the lanthanide series?
Arrange Ce3+, La3+, Pm3+ and Yb3+ in increasing order of their ionic radii.
(a) Yb3+ < Pm3+ < Ce3+ < La3+
(b) Ce3+ < Yb3+ < Pm3+ < La3+
(c) Yb3+< Pm3+ < La3+ < Ce3+
(d) Pm3+ < La3+ < Ce3+ < Yb3+
Identify the incorrect statement among the following.
(a) d- block elements show irregular and erratic chemical properties among themselves
(b) La and Lu have partially filled d-orbitals and no other partially filled orbitals
(c) The chemistry of various lanthanoids is very similar
(d) 4f- and 5f- orbitals are equally shielded
More number of oxidation states are exhibited by the actinoids than by lanthanoids. The main reason for this is
(a) more energy difference between 5f- and 6d-orbitals than that between 4f- and 5d-orbitals
(b) lesser energy difference between 5f- and 6d-orbitals than that between 4f- and 5d-orbitals
(c) greater metallic character of the lanthanoids than that of the corresponding actinoids
(d) more active nature of the actinoids
The actinoids exhibit more number of oxidation states in general than the lanthanoids. This is bacause
(a) the 5f- orbitals are more buried than the 4f- orbitals
(b) there is a similarity between 4f- and 5f- orbitals in their angular part of the wave function
(c) the actinoids are more reactive than the lanthanoids
(d) the 5f- orbitals extend farther from the nucleus than the 4f-orbitals
The point of dissimilarity between lanthanides and actinides is
(a) three outermost shells are partially filled
(b) they show oxidation state of +3(common)
(c) they are called inraer transition elements
(d) they are radioactive in nature
Direction (Q.No.36): In the following question, more than one answers may be correct. Select the correct answers 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
In context of the lanthanoids, which of the following statements are correct?
1. There is a gradual decrease in the radii of the members with increasing atomic number in the series
2. All the members exhibit +3 oxidation state
3. Because of similar properties, the separation of lanthanoids is not easy
4. Availability of 4f- electrons results in the formation of compounds in +4 state for all members of the series
Match metals ions in Column I with their magnetic moment (in BM) in Column II and select the correct codes given below.
Direction (Q.Nos.38-40): 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 a correct explanation for Assertion
(b) Assertion is true, Reason is true; Reason is not a correct explanation for Assertion
(c) Assertion is true, Reason is false
(d) Assertion is false, Reason is true
Assertion: Magnetic moments values of actinides are lesser than the theoretically predicted values.
Reason: Actinide elements are strongly paramagnetic.
Assertion: Europium(II) is more stable than cerium(II).
Reason: Cerium salts are used as a catalyst in petroleum cracking.
Assertion: The catalytic converter in the car’s exhaust system converts polluting exhaust gases into non-toxic gases.
Reason: Catalytic converter contains a mixture of transition metals and their oxides embedded in the inner support.
The number of d- electrons in Fe2+(Z =26) is not equal to the number of electrons in which one of the following?
(a) s- electrons in Mg (Z=12)
(b) p- electrons in Cl (Z=17)
(c) d- electrons in Fe (Z=26)
(d) p- electrons in Ne (Z=10)
Because of lanthanoid contraction, which of the following pairs of elements have nearly same atomic radii? (Numbers in the parenthesis are atomic numbers).
(a) Ti(22) and Zr(40)
(b) Zr(40) and Nb(41)
(c) Zr(40) and Hf(72)
(d) Zr(40) and Ta(73)
Magnetic moment 2.84 BM is given by:
(Atomic number of Ni =28, Ti =22, Cr =24, Co=27)
Reason of lanthanoid contraction is
(a) negligible screening effect of f-orbitals
(b) increasing nuclear charge
(c) decreasing nuclear charge
(d) decreasing screening effect
A magnetic moment of 1.73 BM will be shown by one among the following.
Identify the correct order of solubility in aqueous medium
Which of the following lanthanoid ions is diamagnetic? (Atomic numbers :Ce=58, Sm=62, Eu=63, Yb=70)
Which of the following statements about the interstitial compounds is incorrect?
(a) They are chemically reactive
(b) They are much harder than the pure metal
(c) They have higher melting points that the pure metal
(d) They retain metallic conductivity
Identify the alloy containing a non-metal as a constituent in it.
(c) Bell metal
Which of the statements is not true?
(a) On passing H2S through acidified K2Cr2O7 solution, a milky colour is observed
(b) Na2Cr2O7 is preferred over K2Cr2O7 in volumetric analysis
(c) K2Cr2O7 solution in acidic medium is orange
(d) K2Cr2O7 solution becomes yellow on increasing the pH beyond 7
KI and CuSO4 solution when mixed, give
(a) CuI2 + K2SO4
(b) Cu2I2 + K2SO4
(c) K2SO4 Cu2I2 +I2
(d) K2SO4 + CuI2 +I2
The aqueous solution containing which one of the following ions will be colourless?
(Atomic number of Sc =21, Fe= 26,Ti = 22, Mn= 25)
Four successive members of the first row transition elements are listed below with their atomic numbers. Which one of them is expected to have the highest third ionisation enthalpy?
(a) Vanadium (Z=23)
(b) Chromium (Z=24)
(c) Iron (Z=26)
(d) Manganese (Z=25)
The d-electron configuration of Cr2+, Mn2+, Fe2+ and Co2+ are d4, d5, d6 and d7 respectively. Which one of the following will exhibit minimum paramagnetic behaviour?
(Atomic number: Cr=24,Mn=25, Fe=26,Co=27)
For the four successive transition elements (Cr, Mn, Fe and Co), the stability of +2 oxidation state will be, there in which of the following order?
(Atomic number: Cr= 24, Mn=25,Fe= 26, Co = 27)
Calomel (Hg2Cl2) on reaction with hydroxide solution gives
Which of the following pair has the same size?
(a) Fe2+, Ni2+
(b) Zr4+, Ti4+
(c) Zr4+, Hf4+
(d) Zn2+, Hf4+
Which of the following ions will exhibit colour in aqueous solutions?
(a) La3+ (Z=57)
(b) Ti3+ (Z=22)
(c) LU3+ (Z=71)
(d) Sc3+ (Z=21)
A developer used in photography is
(a) a weak acid
(b) a weak base
(c) a mild reducing agent
(d) an oxidising agent
Which of the following compounds, on reaction with NaOH and Na2O2, gives yellow colour?
The electronic configuration of actinides cannot be assigned with degree of certainty because of
(a) small energy difference between 5f- and 6d- levels
(b) overlapping of inner orbitals
(c) free movement of dteftfShs over all the orbitals
(d) All of the above
MnO4– is of intense pink colour, though Mn is in +7 oxidation state. It is due to
(a) oxygen gives colour to it.
(b) charge transfer when Mn gives its electron to oxygen
(c) charge transfer when oxygen gives its electron to Mn making it Mn (+VI)
(d) presence of unpaired electrons