The oxide,which cannot act as a reducing agent,is

If $5 \cos x + 12 \cos y = 13$,then the maximum value of $5 \sin x + 12 \sin y$ is:

What is obtained when one mole of calcium phosphide is reacted with excess water?

Which of the following is not correct regarding $Terylene$?

The sensitivity of a galvanometer is $60 \text{ division/A}$. When a shunt is used,its sensitivity becomes $10 \text{ division/A}$. If the galvanometer is of resistance $20 \ \Omega$,the value of shunt used is: (in $Omega$)

If $x$ is real,then the minimum value of $y = \frac{x^2-x+1}{x^2+x+1}$ is