Proxy manipulation occurs when a false dhcp server that can provide ip address configuration leases for a unique subnet and define the default gateway because the hacker's computer acts as a mitm router/proxy.

True. A hacker in proxy manipulation may host a false proxy server or better known as a rogue DHCP and is able to modify the proxy settings on a client to redirect traffic to another system. The hacker is able to reconfigure a client’s proxy configuration.

answer: when the substance contain the two parts (polar and non-polar) like soap.

explanation:

soap is produced from the basic hydrolysis of ester "saponification", it is considered as a salt of hydrocarbons. the soap molecule contains the two parts: a polar group   (-coo-na+) and a non-polar group (r-hydrocarbon part). the polar group is called the head and the tail is the non-polar group. the polar group is hydrophilic in nature (water loving) and the non-polar group is hydrophobic in nature (water repelling).the polar/non-polar nature of a substance is useful that it can dissolve the non-polar substances by the polar part and also can dissolve the polar substances by the non-polar part. it commonly used in detergents and soaps.