Q9 of 48 Page 1

Alkanes generally burn with clean flame. Why?

Alkanes generally burns with a clear flame. They burn in air with a blue and non-sooty flame as the carbon percentage in the alkane is low and it gets oxidized completely in air and that’s why it burns with a clear flame.


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Name the oxidising agent used for the conversion of ethanol to ethanoic acid. Distinguish between ethanol and ethanoic acid on the basis of (i) litmus test, (ii) reaction with sodium carbonate.

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Differentiate between alkanes and alkenes. Name and draw the structure of one member of each.

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An element X (atomic number 17) reacts with an element Y (atomic number 20) to a compound.

(a) Write the position of these elements in the modern periodic table.


(b) Write the formula of the compound formed. Justify your answer in each case.


Justify your answer in each case.

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An object of height 5 cm is placed perpendicular to the principal axis of a concave lens of focal length 10 cm. Use lens formula to determine the position, size and nature of the image if the distance of the object from the lens is 20 cm.