Question

39. Select the number of species which have total 4 (lp + bp) pairs of electrons on central atom BeH2, CH4, H2S, C2H2, CH3Cl2, SiCl4, NH, PCl5, SF4, XeF4​

Answer 1

Explanation:

 pipes of same dimensions can fill a water tank in 15 hrs.

If there are 3 pipes instead find how long will it take to fill the tank.

Let's say it will take \boldsymbol xx hrs

Now here, the lesser the pipes the more the time it will take.

Hence it's an inversely proportional.

\therefore \: 4 \times 15 = 3 \times x∴4×15=3×x

Solving for \boldsymbol xx

\implies \: 4 \times 15 = 3 \times x⟹4×15=3×x