Can a quantity have dimesions, but no unit ?

State about the correctness or otherwise of the following two statements. i) A physical quanity can have dimensions but no units. ii) A physical quantity can have units but no dimensions.

Do we have quantity which has dimensions but no unit?

Assertion if two physical quantities have same dimension, then they can be certainly added or subtracted because Reason if the dimension of both the quantities are same then both the physical quantities should be similar .

Quantity having units but no dimensions is

Quantity having units but no dimensions is

The quantity having dimensions only in temperature is

A : A dimensionless quantity may have unit. R : Two physical quantities having same dimensions, may have different units.

Consider following statement :- (A) any physical quantity may have more one unit. (B) Any physical quantity have only one dimensional formula (C ) More than one physical quantities may have same dimension. (D) We can add & subtract only those expression having same dimension. Number of correct statements is :-

The pair of the quantities having same dimensions is

The quantity having negative dimensions in mass is