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Column $I ($Compound$)$
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Column $II ($Oxidation state of $Co)$
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| $a.$ | $\ce{[Co(NCS)(NH_3)_5](SO_3)}$ | $1.$ | $+4$ |
| $b.$ | $\ce{[Co(NH_3)_4Cl_2]SO_4}$ | $2.$ | $0$ |
| $c.$ | $\ce{Na_4[Co(S_2O_3)_3]}$ | $3.$ | $+1$ |
| $d.$ | $\ce{[Co_2(CO)_8]}$ | $4.$ | $+2$ |
| $5.$ | $+3$ |
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Column I (Compound/element)
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Column II (Use)
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(i)
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Lanthanoid oxide
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(a)
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Production of iron alloy
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(ii)
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Lanthanoid
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(b)
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Television screen
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(iii)
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Misch metal
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(c)
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Petroleum cracking
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(iv)
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Magnesium based alloy is constituent of
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(d)
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Lanthanoid metal + iron
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(v)
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Mixed oxides of lanthanoids are employed
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(e)
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Bullets
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(f)
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In X-ray screen
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| $Cr^{2+}/Cr = - 0.9 V$ | $Cr^{3+}/Cr^{2+} = - 0.4 V$ |
| $Mn^{2+}/Mn = 0 1.2 V$ | $Mn^{3+}/Mn^{2+} = +1.5 V$ |
| $Fe^{2+}/Fe = - 0.4 V$ | $Fe^{3+}/Fe^{2+} = +0.8 V$ |