1. Which of the following could act as a Lewis base? A. H 2 O B. PCl 3 C. Lu 3+

Question

1. Which of the following could act as a Lewis base?

A. H2O

B. PCl3

C. Lu3+

D. FeCl3

E. Both (a) and (b) are Lewis bases

2.

For Cu and CH4, which will behave as a Lewis acid toward OH- in water?

A. only Cu

B. only CH4

C. Cu and CH4

D. neither Cu nor CH4

3.Which of the following salts, when dissolved in water, produces a solution that is neutral.

A. KI

B. KBr

C. KCl

D. KF

4. Which one of the following is a basic salt?

A. NaCl

B. NH4Cl

C. KF

D. a, b, and c are all acidic.

E. a, b, and c are all basic

Explanation / Answer

1) Both (a) and (b) are Lewis bases

in H2O ,THERE ARE TWO LONE PAIR OF ELECTRONSON OXYGEN ,WHICH ARE REAADY TO DONATE HENCE IT IS ACTS AS LEWIS BASE.

PCl3 has a LONE PAIR OF ELECTRON IN THE HIGHEST OCCUPIED MOLECULAR ORBITAL AVAILABE FOR DONATION .

2) ONLY COPPER

BECAUSE OF PRESENCE OF VACANT d- orbitals in copper,it is ready to accept the lonepair of electrons.therefore acts as a lewis acid

3) KI BECAUSE it is the combination of strong acid (HI) AND strong base (KOH) .Hence the salts formed by this combination are alway neutral because they under go complete dissociation

4) ANSWE is KF

because it iS formed by the combination of weak acid(HF) and strong base(KOH).the salts which are formed by this combination always hving p^H .7.This can be understood from the following equation

p^H = 7+ (1/2) P^Ka + (1/2) logC

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