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Most transition metals I:forms sets of c...

Most transition metals I:forms sets of compounds which display different oxidation states of the metal.. II: for coloured ions in solution III: bum vigorously inoxygen IV: replace H, from dilute acids of these

A

I, II, III are correct

B

II, III, IV are correct

C

I, II are correct

D

I, IV are correct

Text Solution

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The correct Answer is:
C
I, II are correct
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Explain giving reasons: i. Transition metals and many of their compounds show paramagnetic behaviour. ii. The enthalpies of atomisation of the transition metals are high. iii. The transition metals generally form coloured compounds. Iv. Transition metals and their many compounds act as good catalyst.

Compare the general characteristics of the first series of the transition metals with those of the second and third series metals. in the respective vertical columns. Give special emphasis on the following points: (i) electronic configurations (ii) oxidation states iii) Ionisation enthalpies and iv) atomic sizes.

Knowledge Check

  • Consider following properties of the noble gases which are correct . (I) They readily form compounds which are colourless. (II) They generally do not form ionic compounds. (III) Xenon has variable oxidation states in its compounds. (IV) The smaller He and Ne do not form clathrate compounds.

    A
    I,II,III
    B
    II,III , IV
    C
    I,III,IV
    D
    I,II,III,IV

  • Consider following properties of the noble gases. I) They readily for compounds which are colourless. II) They generally do not form ionic compounds. III) Xenon has variable oxidation states in its compounds. IV) The smaller He and Ne do not form clathrate compounds. Select correct properties:

    A
    I,II,III
    B
    II,III,IV
    C
    I,III,IV
    D
    I,II,III,IV

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    A metallic element A bums In nitrogen gas to form an ionic compound ‘B’ which on treatment with water forms ‘C’ and ‘D’ solution of ‘C’ turns milky on bubbling CO_2 gas through it:- Give equations for the formation of C and D from B.

    Primary alkyl halide C_4 H_9 Br (a) reacted with alcoholic K O H to give compound (b). Compound (b) is reacted with HBr to give (c) which is an isomer of (a). When (a) is reacted with sodtum metal it gives compound (d), C_ 8 H_ 18 which, is different from the compound formed when n-butyl bromide is reacted with sodium. Give the structural formula of (a) and write the equations for all the reactions.

    An aqueous blue coloured solution of a transition metal sulphate reacts with H2S in acidic medium to give a black precipitate A, which is insoluble in warm aqueous solution of KOH. The blue solution an treatment with KI is weakly acidic medium, turns yellow and produces a white precipitate B. Identify the transition metal ion. Write the chemical reactions involved in the formation of A and B.

    a. A blackish brown coloured solid A when fused with alkali metal hydroxides in presence of air produces a dark green coloured compound B which on electrolytic.oxidation in alkaline medium gives a dark purple coloured compound C. Identify A, B and C and write the reactions involved. (b) what happens when an acidic solution of the green compotind 'B' is allowed to stand for sometime? Give the equations involved. What is this type of reaction called?

    Choose the incorrect statement which is suitable to 'd' block elements. a. form coloured compounds. b. Larger size across the period. c. Show various oxidation states. d. They are metals.

    Which of the following is incorrect w.r.t. transition elements ? :They easily form complexes, They forms coloured ions, Show variable oxidation states always differing by two units, Cr has highest MP in 1^(st) transition series

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