During the fractional distillation of crude oil, the fraction that distills at 200 - 250^0 C is

How many isomers has the organic compound represented by the formula C_3H_8O ?

The number of molecules of helium gas contained in 11.5g of the gas is

When Calcium ethynide is decomposed by water, the gas produced is

Silver and Gold are metals found as free uncombined elements in the earth's crust, which makes them to be referred to as

Biuret test is a chemical test used for detecting the presence of

A gas when mixed with oxygen, it produces a very hot and early controllable flame. What is the name of the flame and where is it used?

127g of sodium chloride was dissolved in $1.0dm^3$ of distilled water at $25^0C$ . Determine the solubility in $moldm^{-3}$ of sodium chloride at that temperature. [Na = 23, Cl = 35.5]