ECAT Chemistry MCQs

Enzymes lower activation energy and increase reaction rate.
They are selective for particular substrates and conditions.

The molecule has a two-carbon carboxylic acid chain.
Its IUPAC name is ethanoic acid.

Qualitative analysis determines what is present.
It may use color changes, precipitates, spectra, or instrumental signals.

Quantitative methods produce numerical concentration or mass results.
Accuracy, precision, and calibration are essential.

Components travel at different rates through the system.
Chromatography can separate, identify, and quantify substances.

Solutes interact differently with the stationary phase.
Stronger interaction generally slows movement.

The mobile phase may be a liquid or gas.
Its composition influences separation.

For suitable dilute solutions, absorbance is proportional to concentration.
The relationship also depends on molar absorptivity and path length.

Alkynes are unsaturated hydrocarbons.
The triple bond contains one sigma and two pi bonds.

Elimination often removes H and another group from adjacent atoms.
It commonly forms an alkene.

Each carbon in an alkane forms four bonds.
An open-chain saturated hydrocarbon follows CnH2n+2.

Complete combustion gives carbon dioxide and water.
Limited oxygen may produce carbon monoxide or soot.