Pakistan MCQs

The equilibrium expression is Kc=[B]/[A]^2.
Kc=0.25/(0.50)^2=1.

Titration uses a measured reaction stoichiometry.
The endpoint signals that the required amount of titrant has been added.

Because Q<K, more products must form.
The reaction proceeds forward until Q reaches K.

The equivalence point is defined by reaction stoichiometry.
Its pH depends on acid and base strengths.

Arrhenius acids produce hydrogen ions in aqueous solution.
The model applies specifically to water.

Arrhenius bases increase hydroxide-ion concentration in water.
Many metal hydroxides fit this definition.

Brønsted-Lowry acid-base reactions involve proton transfer.
The acid loses H+ to a base.

A Brønsted-Lowry base accepts H+.
It forms its conjugate acid.

Lewis theory focuses on electron-pair transfer.
Many metal ions and electron-deficient molecules act as Lewis acids.

Lewis bases donate a lone pair to form a coordinate bond.
Ammonia is a common example.

An acid forms its conjugate base after donating H+.
A base forms its conjugate acid after accepting H+.

Digestion converts large food molecules into absorbable units.
The small intestine absorbs most nutrients.