Which is not a physical property?

a)state
b)density
c)ductility
d)flammability

I think it's d.

Which one of these processes are chemically created?

a)erosion of riverbank
b)flow of molten lava
c)heaving of rock by ice formation
d)formation of limestone cave

?

To determine which is not a physical property of the given options, we need to understand what physical properties are. Physical properties are characteristics that can be observed or measured without modifying the substance.

Let's evaluate each option:

a) State - The physical state of a substance such as solid, liquid, or gas, is a physical property.
b) Density - The mass per unit volume of a substance, which is a characteristic property, is a physical property.
c) Ductility - The ability of a substance to be drawn into a thin wire is a physical property.
d) Flammability - Flammability is the ability of a substance to burn; this is a chemical property.

Therefore, the answer is d) flammability, as it is not a physical property but a chemical property.

Regarding the second question, we need to determine which process is chemically created.

a) Erosion of riverbank - Erosion is a physical process caused by the movement of water or wind, and it doesn't involve any chemical reactions.
b) Flow of molten lava - This process involves the flow of molten rock and does not involve any chemical reactions.
c) Heaving of rock by ice formation - This is a physical process caused by the expansion of water when it freezes into ice.
d) Formation of limestone cave - This process involves the chemical reaction of water with limestone, resulting in the formation of caves.

Therefore, the answer is d) formation of limestone cave, as it involves a chemical reaction.