MDCAT 2026 MCQs

Six CN- ligands contribute -6 total.
Fe must be +2 to give overall charge -4.

An ore contains a useful mineral in sufficient concentration.
Economic and technological factors determine whether extraction is worthwhile.

Roasting commonly converts sulfide ores to oxides.
Sulfur is often released as sulfur dioxide.

Calcination removes volatile components such as CO2 or water.
Carbonates may be converted to oxides.

The Haber process combines nitrogen and hydrogen.
It uses high pressure, elevated temperature, and an iron catalyst.

The Contact process oxidizes SO2 to SO3 using a catalyst.
SO3 is then converted into sulfuric acid through controlled absorption.

Axons conduct action potentials to target cells.
Some are insulated by myelin.

SO3 is a nonmetal oxide and forms sulfuric acid with water.
Metal oxides listed are predominantly basic.

For first order, rate=k[A].
Rate=0.20×0.50=0.10 M/s.

Sodium oxide reacts with water to form sodium hydroxide.
It is a strongly basic metal oxide.

The rate depends on the square of concentration.
Doubling gives 2²=4 times the rate.

Transition-metal chemistry arises from partially filled d orbitals.
Common features include variable oxidation states and colored ions.