<p>On a planet, a body is let fall freely from a height 8m reaches the ground in 2 sec. If the length of a simple pendulum is 1m on that planet, its time period is</p>

<p>In calcium fluoride, having the fluorite structure, the coordination numbers for calcium ion&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><msup><mi>Ca</mi><mrow><mn>2</mn><mo>+</mo></mrow></msup></math>and fluoride ion&nbsp;&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><msup><mi mathvariant="normal">F</mi><mo>-</mo></msup></math>&nbsp;are</p>

<p>All the following are crystalline solids except</p>

<p>Which of the following is covalent &nbsp;crystalline solid</p>

<p>The ionic radii of &nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><msup><mi mathvariant="normal">A</mi><mo>+</mo></msup></math>and &nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><msup><mi mathvariant="normal">B</mi><mo>-</mo></msup></math>&nbsp;ions are&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><mn>0</mn><mo>.</mo><mn>98</mn><mo>×</mo><msup><mn>10</mn><mrow><mo>-</mo><mn>10</mn></mrow></msup><mi mathvariant="normal">m</mi></math>&nbsp;and&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><mn>1</mn><mo>.</mo><mn>81</mn><mo>×</mo><msup><mn>10</mn><mrow><mo>-</mo><mn>10</mn></mrow></msup><mi mathvariant="normal">m</mi></math>. The coordination number of each ion in AB is</p>

<figure class="table" style="width:450px;"><table><tbody><tr><td>&nbsp;</td><td><strong>List - I</strong></td><td>&nbsp;</td><td><strong>List - II</strong></td></tr><tr><td>a)</td><td>Metallic</td><td>i)</td><td>CaF<sub>2</sub></td></tr><tr><td>b)</td><td>Covalent solid</td><td>ii)</td><td>SiC</td></tr><tr><td>c)</td><td>Non-polar molecule</td><td>iii)</td><td>H<sub>2</sub>O</td></tr><tr><td>d)</td><td>Ionic</td><td>iv)</td><td>I<sub>2</sub></td></tr><tr><td>e)</td><td>Polar molecule</td><td>v)</td><td>Ag</td></tr><tr><td>&nbsp;</td><td>&nbsp;</td><td>vi)</td><td>Ar</td></tr></tbody></table></figure><p>The correct answer is<br>&nbsp;</p><figure class="table" style="width:450px;"><table><tbody><tr><td>&nbsp;</td><td>a</td><td>b</td><td>c</td><td>d</td><td>e</td></tr><tr><td>1)</td><td>v</td><td>ii</td><td>iv</td><td>i</td><td>iii</td></tr><tr><td>2)</td><td>vi</td><td>iv</td><td>ii</td><td>iii</td><td>i</td></tr><tr><td>3)</td><td>v</td><td>iii</td><td>iv</td><td>ii</td><td>iii</td></tr><tr><td>4)</td><td>v</td><td>iv</td><td>vi</td><td>iii</td><td>&nbsp;</td></tr></tbody></table></figure>

On a planet, a body is let fall freely from a height 8m reaches the ground in 2 sec. If the length of a simple pendulum is 1m on that planet, its time period is

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