In a model of a ship, the mast is 9 cm high, while the mast of the actual ship is 12 m high. If the length of the ship is 28 m, how long is the model ship?

Which one of the following compounds will give white precipitate with Tollens reagent?

Which of the following statements is true for ethane, ethene and acetylene ?

A mixture of&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>CH</mi><mn>4</mn></msub><mo>,</mo><mo>&nbsp;</mo><mo>&nbsp;</mo><msub><mi mathvariant="normal">C</mi><mn>2</mn></msub><msub><mi mathvariant="normal">H</mi><mn>4</mn></msub><mo>&nbsp;</mo><mo>&nbsp;</mo><mi>and</mi><mo>&nbsp;</mo><msub><mi mathvariant="normal">C</mi><mn>2</mn></msub><msub><mi mathvariant="normal">H</mi><mn>2</mn></msub></math>&nbsp;gases are passed through a Wolf bottle containing ammonical cuprous chloride. The gas coming out is

Which is the most suitable reagent to distinguish compound (3) from the others? <math xmlns="http://www.w3.org/1998/Math/MathML"><mtable columnalign="left"><mtr><mtd><mn>1</mn><mo>)</mo><mtext>  </mtext><msub><mi>CH</mi><mn>3</mn></msub><mi mathvariant="normal">C</mi><mo>≡</mo><mi mathvariant="normal">C</mi><mo>−</mo><msub><mi>CH</mi><mn>3</mn></msub><mtext> &nbsp;&nbsp;&nbsp;&nbsp;                 </mtext><mn>2</mn><mo>)</mo><mtext>  </mtext><msub><mi>CH</mi><mn>3</mn></msub><msub><mi>CH</mi><mn>2</mn></msub><mo>−</mo><msub><mi>CH</mi><mn>2</mn></msub><mo>−</mo><msub><mi>CH</mi><mn>3</mn></msub></mtd></mtr><mtr><mtd><mn>3</mn><mo>)</mo><mtext>   </mtext><msub><mi>CH</mi><mn>3</mn></msub><msub><mi>CH</mi><mn>2</mn></msub><mi mathvariant="normal">C</mi><mo>≡</mo><mi>CH</mi><mtext> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;                 </mtext><mn>4</mn><mo>)</mo><mtext>  </mtext><msub><mi>CH</mi><mn>3</mn></msub><mi>CH</mi><mo>=</mo><msub><mi>CH</mi><mn>2</mn></msub></mtd></mtr></mtable></math>

If<math xmlns="http://www.w3.org/1998/Math/MathML"><mo>&nbsp;</mo><mi mathvariant="normal">k</mi><mo>+</mo><mn>3</mn><mo>,</mo><mo>&nbsp;</mo><mn>2</mn><mo>,</mo><mo>&nbsp;</mo><mn>3</mn><mi mathvariant="normal">k</mi><mo>&nbsp;</mo><mi>and</mi><mo>&nbsp;</mo><mn>3</mn></math>&nbsp;are in proportion then the value of k is ________.

In a model of a ship, the mast is 9 cm high, while the mast of the actual ship is 12 m high. If the length of the ship is 28 m, how long is the model ship?

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Length of actual ship (in m)	12	28
Length of model ship (in cm)	9	x