Test: d & f-Block Elements - 2 - Question 1
(T) imparts violet colour (V) Red gas (W) Red ppt.
(W) Red ppt. white ppt.
(U) gas (gives white fumes with HCl)
sublimes on heating Identify (T) to (Z).
A. T = KMnO4 , U = HCl, V = Cl2 , W = HgI2 , X =Hg(NH2 )NO3 , Y = Hg2 Cl2 , Z = N2
B. T = K2 Cr2 O7 , U = NH4 Cl, V = CrO2 Cl2 , W = Ag2 CrO4 , X = [Ag(NH3 )2 ]+ , Y = AgCl,Z=NH3
C. T = K2 CrO4 , U = KCl, V = CrO2 Cl2 , W = HgI2 , X = Na2 CrO4 , Y = BaCO3 , Z = NH4 Cl
D. T = K2 MnO4 , U = NaCl, V = CrO3 , W = AgNO2 , X = (NH4 )2 CrO4 , Y = CaCO3 , Z = SO2
Detailed Solution: Question 1
The correct answer is option B
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Test: d & f-Block Elements - 2 - Question 2
The number of moles of acidified KMnO4 required to convert one mole of sulphite ion into sulphate ion is-
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Test: d & f-Block Elements - 2 - Question 3
N2 (g) + 3H2 (g) 2NH3 (g) ; Haber's process, Mo is used as -
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MO is catalytic promoter & it improves catalytic properties as catalyst
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Test: d & f-Block Elements - 2 - Question 4
Potash alum is a double salt, its aqueous solution shows the characteristics of-
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K2 SO4 .Al2 (SO4 )3 .24 H2 O + H2 O
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Test: d & f-Block Elements - 2 - Question 5
Cr2 O7 2- 2CrO4 2- , X and Y are respectively-
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Test: d & f-Block Elements - 2 - Question 6
Addition of non-metals like B and C to the interstitial sites of a transition metal results the metal-
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Interstitial compound results in (A) hardness increses (B) Malleability (decreases) (C) Ductality (decreases)
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Test: d & f-Block Elements - 2 - Question 7
Mercury is a liquid at 0°C because of-
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Weak metallic bond as due to poor shielding of d & f orbital its ionisation energy became high & kernel formation becomes difficult.
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Test: d & f-Block Elements - 2 - Question 8
CrO3 dissolves in aqueous NaOH to give-
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Test: d & f-Block Elements - 2 - Question 9
The correct statement(s) about transition elements is/are-
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All statements are comeet [Ni(CO)4 ], [Fe(CO)5 ] [Cr(CO)5 ]
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Test: d & f-Block Elements - 2 - Question 10
An ornament of gold having 75% of gold, it is of .............. carat.
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100% – 24 carat
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Test: d & f-Block Elements - 2 - Question 11
Solution of MnO4- is purple-coloured due to-
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MnO4 – has purple colour due to change transfer
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Test: d & f-Block Elements - 2 - Question 12
The ionisation energies of transition elements are-
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Ionisation energies are between s & p-block.
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Test: d & f-Block Elements - 2 - Question 13
Transition elements having more tendency to form complex than representative elements (s and p-block elements) due to-
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Complex pormation α (Zeff = Z –σ) tendency
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Test: d & f-Block Elements - 2 - Question 14
During estimation of oxalic acid Vs KMnO4 , self indicator is-
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KMnO4 acts as self indicator.
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Test: d & f-Block Elements - 2 - Question 15
The metal(s) which does/do not form amalgam is/are-
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Test: d & f-Block Elements - 2 - Question 16
Which of the following statements concern with transition metals ?
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Test: d & f-Block Elements - 2 - Question 17
Correct statement(s) is/are-
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exothermic reaction (volcanic reaction)
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Test: d & f-Block Elements - 2 - Question 18
The highest oxidation state among transition elements is-
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O5 (Xe)4 f14 sd6 6s2 O5 8+ (Xe) 4f4
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Test: d & f-Block Elements - 2 - Question 19
A compound of mercury used in cosmetics, in Ayurvedic and Yunani medicines and known as Vermilon is-
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Vermilon cantain floulsmelly HgS.
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Test: d & f-Block Elements - 2 - Question 20
Acidified chromic acid
X and Y are - (blue colour)
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Test: d & f-Block Elements - 2 - Question 21
X(Blue colour ),X and Y are
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CuSO4 + dilH2 SO4 → [Cu(H2 O)4 ]SO4
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Test: d & f-Block Elements - 2 - Question 22
Transition elements are usually characterised by variable oxidation states but Zn does not show this property because of-
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Fully pilled d-subshell Zn →Zn2+ + 2e- 3d10 4s2 3d10
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Test: d & f-Block Elements - 2 - Question 23
(NH4 )2 Cr2 O7 (Ammonium dichromate) is used in fire works. The green coloured powder blown in air is-
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Test: d & f-Block Elements - 2 - Question 24
The d-block element which is a liquid at room temperature, having high specific heat, less reactivity than hydrogen and its chloride (MX2 ) is volatile on heating is-
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HgCl2 is volatile is reffered as corrosive sublimate.
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Test: d & f-Block Elements - 2 - Question 25
Coinage metals show the properties of-
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Cu, Ag, Au, are coinage metal used in coin in older days.
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Test: d & f-Block Elements - 2 - Question 26
Iron becomes passive by..................due to formation of ................
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Fe + HNO3 → Fe2 O3 + NO2 + H2 O 80%
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Test: d & f-Block Elements - 2 - Question 27
Bayer's reagent used to detect olifinic double bond is-
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Cold dilute alkaline KMnO4 is Bayer’s neagent.
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Test: d & f-Block Elements - 2 - Question 28
Amphoteric oxide(s) is/are-
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oxide of Be, Al, Zn, Cr, Pb, Sn, As, are amphoteric
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Test: d & f-Block Elements - 2 - Question 29
Interstitial compounds are formed by-
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Transition element froms intershtial compound.
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Test: d & f-Block Elements - 2 - Question 30
The transition metal used in X-rays tube is-
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Mo is used become of its high melting point.
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