(i) x+y
This expression contains two terms x and y
So, it is called ‘Binomial’
(ii) 1000
It contains one term 1000
So, it is called monomial
(iii) \(x+x^{2}+x^{3}+x^{4}\)
It contains four terms
So, it is not a monomial, binomial and trinomial
(iv) 7+a+5b
It contains three terms
So, it is called trinomial
(v) \(2b-3b^{2}\)
It contains two terms
So, it is called binomial
(vi) \(2y-3y^{2}+4y^{3}\)
It contains three terms
So, it is called trinomial
(vii) 5x-4y+3x
8x – 4y
It contains two terms
So, it is called binomial
(viii) \(4a-15a^{2}\)
It contains two terms
So, it is called binomial
(ix) xy+yz+zt+tx
It contains four terms
So, it is not a monomial, binomial and trinomial
(x) pqr
It contains one term
So, it is called monomial
(xi) \(p^{2}q+pq^{2}\)
It contains two terms
So, it is called binomial
(xii) 2p+2q
It contains two terms
So, it is called monomial