Which climate conditions will cause the fastest chemical weathering of granite sandstone and shale?

The correct answer is - tropical wet.

The tropical wet climate conditions are the ones that will enable the quickest chemical weathering of the granite, sandstone, and shale. That is due to the constant heat, high humidity, and daily rain pours.

The water from the rain, and the intense humidity caused by the heat, will interact with the rocks and will be altering their surface with the chemical properties it posses.

In a very small period of time, the rocks will start to be weathering, change their shape, and lose layers.