Among statements (a) - (d), the correct ones are:

(a) Lime stone is decomposed to $\mathrm{C}\mathrm{a}\mathrm{O}$ during the extraction of iron from its oxides.

(b) In the extraction of silver, silver is extracted as an anionic complex.

(c) Nickel is purified by Mond's process.

(d) Zr and Ti are purified by Van Arkel method.

<p><strong> (a)</strong> In extraction of iron lime stone is added on a flux</p><p><math><mtable columnalign="right"><mtr><mtd><mrow></mrow></mtd><mtd><mrow><msub><mrow><mrow><mi mathvariant="normal">C</mi><mi mathvariant="normal">a</mi><mi mathvariant="normal">C</mi><mi mathvariant="normal">O</mi></mrow></mrow><mrow><mrow><mn>3</mn></mrow></mrow></msub><mo>? </mo><mi mathvariant="normal">C</mi><mi mathvariant="normal">a</mi><mi mathvariant="normal">O</mi><mo>+</mo><msub><mrow><mrow><mi mathvariant="normal">C</mi><mi mathvariant="normal">O</mi></mrow></mrow><mrow><mrow><mn>2</mn></mrow></mrow></msub></mrow></mtd></mtr><mtr><mtd><mrow></mrow></mtd><mtd><mrow><msub><mrow><mrow><mi mathvariant="normal">C</mi><mi mathvariant="normal">O</mi></mrow></mrow><mrow><mrow><mn>2</mn></mrow></mrow></msub><mo>+</mo><msub><mrow><mrow><mi mathvariant="normal">S</mi><mi mathvariant="normal">i</mi><mi mathvariant="normal">O</mi></mrow></mrow><mrow><mrow><mn>2</mn></mrow></mrow></msub><mo>? </mo><msub><mrow><mrow><mi mathvariant="normal">C</mi><mi mathvariant="normal">a</mi><mi mathvariant="normal">S</mi><mi mathvariant="normal">i</mi><mi mathvariant="normal">O</mi></mrow></mrow><mrow><mrow><mn>3</mn></mrow></mrow></msub></mrow></mtd></mtr></mtable></math></p><p><strong> (b)</strong> Extraction of silver</p><p><math><mi mathvariant="normal">A</mi><mi mathvariant="normal">g</mi><mo>+</mo><mi mathvariant="normal">N</mi><mi mathvariant="normal">a</mi><mi mathvariant="normal">C</mi><mi mathvariant="normal">N</mi><mo>? </mo><msup><mrow><mrow><mfenced open=" [" close="]" separators="|"><mrow><mrow><mtable columnalign="left"><mtr><mtd><mrow><mtext>&nbsp;</mtext><mtext>anionic complex</mtext><mtext>&nbsp;</mtext></mrow></mtd></mtr><mtr><mtd><mrow><mi mathvariant="normal">A</mi><mi mathvariant="normal">g</mi><mo> (</mo><mi mathvariant="normal">C</mi><mi mathvariant="normal">N</mi><msub><mrow><mrow><mo>)</mo></mrow></mrow><mrow><mrow><mn>2</mn></mrow></mrow></msub></mrow></mtd></mtr></mtable></mrow></mrow></mfenced></mrow></mrow><mrow><mrow><mo>-</mo></mrow></mrow></msup></math></p><p><strong> (c) </strong>Nickel is purified by Mond's process</p><p><strong> (d)</strong>&nbsp;<math><mi mathvariant="normal">Z</mi><mi mathvariant="normal">r</mi></math>&nbsp;and&nbsp;<math><mi mathvariant="normal">T</mi><mi mathvariant="normal">i</mi></math>&nbsp;are purified by Van Arkel method by converting to volatile iodide.</p>

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