Question 1

Identify the incorrect statement from the following :

Accepted Answer

Carbon has a strong tendency to form p -p multiple bonds with itself, such as in alkenes and alkynes. Thus, the first statement is correct. BCl _3 exists as a monomer because boron cannot expand its octet to form a dimer, whereas AlCl _3 exists as a dimer ( Al _2 Cl _6) to complete its octet. Thus, the second statement is correct. The catenation property depends on the element-element bond strength. The bond enthalpy decreases down the group, so the order of catenation is C >> Si > Ge Sn. Thus,

Question 2

In potash alum, the ratio of K^+ and SO_4^ 2- ions is

Accepted Answer

The chemical formula of potash alum is K _2 SO _4 Al _2( SO _4)_3 24 H _2 O . In one formula unit of potash alum, the number of K ^+ ions is 2. The number of SO _4^ 2- ions is 1 + 3 = 4. The ratio of K ^+ to SO _4^ 2- ions is 2:4, which simplifies to 1:2. Answer: 1:2

p Block Elements (Group 13 & 14) — Previous Year Questions & Solutions