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In the following statements, which combi...

In the following statements, which combination of true (T) or false (F) options is correct? I. Hydroxides of lanthanoides are less basic than actinoides br II. Eu2+ is a good reducing agent. br III. Actinoides show greater range of oxidation states than lanthanoides. br IV. Aqueous solution of `Ce^(3+)` is green

A

I,II,IV

B

II,III,IV

C

I,II,III

D

I,III,IV

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Assign reasons for the following : (i) Copper (I) ion is not known in aqueous solution. (ii) Actinoids exhibit greater range of oxidation states than lanthanoids.

Give reasons for the following: (i) Transition metals exhibit a wide range of oxidation states. (ii) Cobalt (II) is very stable in aqueous solutions but gets easily oxidised in the presence of strong ligands. (iii) Actinoids exhibit a greater range of oxidation states than lanthanoids.

In the following statement, which combination of true (T) and false (F) options in correct? (A). Ionic mobility is highest of I^(-) in water as compared to other halides. (B). IF_(5) is square pyramidal and IF_(7) is pentangonal bipyramidal in shape (C). Reactivity order is F_(2)ltCl_(2)ltBr_(2)ltI_(2) (D). Oxidising power order is F_(2)ltCl_(2)ltBr_(2)ltI_(2)

Which statement among the following are correct ? I. Ce^(+3) is an oxidizing agent & colourless. II. Lu^(3+) is colourless. III. Actinoids exhibit a higher number of oxidation states than lanthanoid IV. All 3d elements give H_(2) with 1 M HCl

Which of the following statements are true (T) and which are false (F)? (i) Sum of the three sides of a triangle is less than the sum of its three altitudes. (ii) Sum of any two sides of a triangle is greater than twice the median drawn to the third side. (iii) Sum of any two sides of a triangle is greater than the third side. (iv) Difference of any two sides of a triangle is equal to the third side. (v) If two angles of a triangle are unequal, then the greater angle has the larger side opposite to it. (vi) Of all the line segments that can be drawn from a point to a line not containing it, the perpendicular line segment is the shortest one.

How would you account for the following : (i) The metallic radii of the third (5d) series of transition metals are virtually the same as those of the corresponding group members of the seconds (4d) series. (ii) There is a greater range of oxidation states among the actinoids than among the lanthanoids.

(a) When a chromite ore (A) is fused with an aqueous solution of sodium carbonate in free excess of air, a yellow solution of compound (B) is obtained. This solution is filtered and acidified with sulphuric acid to form compound (C). Compound (C) on treatment with solution of KCl gives orange crystals of compound (D). Write the chemical formulae of compounds A to D. (b) Describe the cause of the following variations with respect to lanthanoids and actinoids: (i) Greater range of oxidation states of actinoids as compared to lanthanoids. (ii) Greater actinoid contraction as compared to lanthanoid contraction. (iii) Lower ionisation enthalpy of early actinoids as compared to the early lanthanoids.

Give an explanation for each of the following observations: (i) The gradual decrease in size (actinoid con-traction) from element to element is greater among the actinoids than that among the lanthanoids (lanthanoid contraction). (ii) The greater number of oxidation states are exhibited by the members in the middle of a transition series. (iii) With the same d-orbital (d^4) , Cr^(2+) ion is a reducing agent but Mn^(3+) ion is an oxidising agent.

(a) Complete the following chemical equations for reactions : (i) MnO_(4(aq))^(-) + S_(2)O_(3(aq))^(2-) + H_(2)O_((l)) to (ii) Cr_(2)O_(7 (aq))^(2-) + H_(2)S_((g)) + H_((aq))^(+) to (b) Give an explanation for each of the following observations : (i) The gradual decrease in size (actinoid contraction) from element to element is greater among the actinoids than that among the lanthanoids (lanthanoid contraction.) (ii) The greatest number of oxidation states are exhibited by the members in the middle of a transition series. (iii) With the same d-orbitals configuration (d^(4)) Cr^(2+) ion is a reducing agent but Mn^(3+) ion is an oxidising agent .

Consider the following statement in respect of Lantinanoids : (i) The basic strength of hydroxides of lanthanoids increases from La (OH)_(3) to Lu (OH)_(3) . (ii) The lanthanoid ions Lu^(3+), Yb^(2+) and Ce^(4+) are diamagnetic. Which of the statements (s) given above is /are correct ?

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