Pakistan MCQs

Oxidation numbers sum to the overall charge of the species.
Applying standard rules gives the stated value.

Use E°cell=E°cathode-E°anode.
0.80-(-0.40)=1.20 V.

The nervous system uses electrical and chemical signals.
It detects stimuli and coordinates responses.

Oxygen is the most abundant element in Earth's crust by mass.
It occurs mainly in oxides and silicate minerals.

The nervous system uses electrical and chemical signals.
It detects stimuli and coordinates responses.

Aluminum is the most abundant crustal metal.
It is commonly found in aluminosilicate minerals and bauxite.

Neurons receive, process, and transmit information.
They communicate through synapses.

Alkali metals have one valence electron.
They usually lose it to form +1 ions.

Neurons receive, process, and transmit information.
They communicate through synapses.

Group 2 metals have two valence electrons.
They commonly lose both and form +2 ions.

Water, glucose, ions, and other substances are reabsorbed.
The process maintains body composition.

Water, glucose, ions, and other substances are reabsorbed.
The process maintains body composition.