(i) The sun is a star, it is mathematical statement, as it is always true
(ii) Go to market, is not, as it is order given so no mathematical statement.
(iii) Who is chief-minister of West Bengal?
No, it is not mathemtical statement as it is question
(iv) The prime factor of 15 are 3 and 5.
It is a statement which is always true, so it is mathematical statement.
(v) May God bless you!
No, it is not mathematical statement as it is blessing
(vi) How nice building is!
It is exclamatory statement so no material reasoning.
It is true for some value of x and false for some value of x, so it is not mathematical statement.
(viii) The roofs of 2x2–3x–5 = 0 are 1 and -5/2
The given statement is alwys false so it is mathematical statement.