Assertion : Bond angle in ethers is slightly less than the tetrahedral angle. Reason : There is a repulsion between the two bulky (-R) groups.

Bond angle in dimethyl ether is more than water.

Bond angle in NH_4^+ is more than that in NH_3 .

C-O-C bond angle in ethers is higher than H-O-H bond angle in water through O is sp^3 -hybridisedin both the cases.

Bond angle in (PH_4)^+ is higher than that in PH_3 . Why?

The question given below consist of an assertion (A) and a reason ( R). Use the following key to choose the appropriate answer to these questions from the codes (a), (b), ( c) and (d) given below: (a) Both A and R are true and R is the correct explanation of A. (b) Both A and R are true but R is NOT the correct explanation of A. (c) A is true but R is false. (d) A is false and R is also false. Assertion:Two long parallel current carrying conductors pull each other apart. Reason:Force of repulsion acts between the two current carrying conductors.

Define critical angle and polarising angle.What is the relation between the two?

In a triangle interior opposite angle is always less than :