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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

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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.

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 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.

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BRILLIANT PUBLICATION-THE D-AND F-BLOCK ELEMENTS-QUESTIONS (LEVEL-III)
  1. When manganous salt is fused with a mixture of KNO3 and solid NaOH, th...

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  2. Consider following statements, I. The size of the lanthanide M^(3+) io...

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  3. Most transition metals I:forms sets of compounds which display differe...

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  4. [Fe(H2 O)5 NO]^(2+) is brown-ring complex. In this complex

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  5. When K2 CrO4 is added to CuSO4 solution, there is formation of CuCrO4...

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  6. Select the correct statements(s)

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  7. Which of the following statements are true?

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  8. Although +3 is the characteristic oxidation state for lanthanoids, cer...

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  9. Select correct statements.

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  10. When CO2 is passed into aqueous

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  11. Select correct statements (s)

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  12. Which of the following statements are correct

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  13. Amongst the following, identify the species with an atom in +6 oxidati...

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  14. Which metals are present in german silver?

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  15. The complex forming tendency of a transition metal depends upon:

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  16. The correct statements about Cr^(2+) and Mn^(3+) is (are) (Atomic numb...

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  17. Which of the following salt solutions will be coloured?

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  18. Potassium manganate (K2 MnO4) is formed when

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  19. The magnetic moment of a metal ion of first transition series is 2.83 ...

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  20. The coefficient of H2 SO4 on balancing the following equation is .......

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