d- and f-Block Elements · JEE Main previous year questions

2019 5 questions

1. Q652019 · 10 Apr 2019 · Shift 1

   Consider the hydrated ions of $\mathrm{T}{\mathrm{i}}^{2+}$, ${\mathrm{V}}^{2+}$, $\mathrm{T}{\mathrm{i}}^{3+}$, and $\mathrm{S}{\mathrm{c}}^{3+}$. The correct order of their spin-only magnetic moments is :

   1. A.$\mathrm{S}{\mathrm{c}}^{3+}<\mathrm{T}{\mathrm{i}}^{3+}<{\mathrm{V}}^{2+}<\mathrm{T}{\mathrm{i}}^{2+}$
   2. B.$\mathrm{S}{\mathrm{c}}^{3+}<\mathrm{T}{\mathrm{i}}^{3+}<\mathrm{T}{\mathrm{i}}^{2+}<{\mathrm{V}}^{2+}$
   3. C.$\mathrm{T}{\mathrm{i}}^{3+}<\mathrm{T}{\mathrm{i}}^{2+}<\mathrm{S}{\mathrm{c}}^{3+}<{\mathrm{V}}^{2+}$
   4. D.${\mathrm{V}}^{2+}<\mathrm{T}{\mathrm{i}}^{2+}<\mathrm{T}{\mathrm{i}}^{3+}<\mathrm{S}{\mathrm{c}}^{3+}$
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   Answer: B

2. Q852019 · 9 Apr 2019 · Shift 1

   The number of water molecule(s) not coordinated to copper ion directly in $\mathrm{CuS}{\mathrm{O}}_4.5{\mathrm{H}}_2\mathrm{O}$, is :

   1. A.2
   2. B.4
   3. C.3
   4. D.1
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   Answer: D

3. Q862019 · 8 Apr 2019 · Shift 2

   The maximum prescribed concentration of copper in drinking water is :

   1. A.3 ppm
   2. B.5 ppm
   3. C.0.5 ppm
   4. D.0.05 ppm
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   Answer: A

4. Q652019 · 12 Jan 2019 · Shift 1

   The pair of metal ions that can give a spin only magnetic moment of 3.9 BM for the complex $[\mathrm{M}({\mathrm{H}}_2\mathrm{O}{)}_6]C{l}_2$, is -

   1. A.${\mathrm{V}}^{2+}$ and $\mathrm{F}{\mathrm{e}}^{2+}$
   2. B.${\mathrm{V}}^{2+}$ and $\mathrm{C}{\mathrm{o}}^{2+}$
   3. C.$\mathrm{C}{\mathrm{o}}^{2+}$ and $\mathrm{F}{\mathrm{e}}^{2+}$
   4. D.$\mathrm{C}{\mathrm{r}}^{2+}$ and $\mathrm{M}{\mathrm{n}}^{2+}$
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   Answer: B

5. Q722019 · 9 Jan 2019 · Shift 1

   The highest value of the calculated spin only magnetic moment (in BM) among all the transition metal complexes is :

   1. A.5.92
   2. B.6.93
   3. C.3.87
   4. D.4.90
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   Answer: A