Tag: p-block elements

Questions Related to p-block elements

The incorrect order is :

group 17 elements - trends in chemical properties group 17 elements - properties p- block elements-ii p-block elements chemistry

  1. Thermal stability : $HF > HCl > HBr$

  2. Lewis basic character : $PF _3 < PCl _3 < PBr _3$

  3. $\%$ p-character : $NO^+ _2 > NO^- _3 > NH^+ _4$

  4. Bond angle : $NH _3 > PH _3 > AsH _3$

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Correct Option: C

Correct order of volatility is:

group 17 elements - trends in chemical properties group 17 elements - properties p- block elements-ii p-block elements chemistry

  1. $HF > HCl > HBr > HI$

  2. $HCl > HBr > HI > HF$

  3. $HI > HBr > HCl > HF$

  4. $HBr < HCl < HI < HF$

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Correct Option: B
Explanation:

Volatility depends on intermolecular interactions of a compound, as molecular weight increases so do the Vander wals forces. So the expected order should be: $HF < HCl<HBr<HI$ but we must remember HF has hydrogen bonding and the extent of Hydrogen bonding is very high because of high electonegativity of fluorine and linear bonding. Hence HF is least volatile. The correct order is $HCl>HBr>HI >HF$.

Bromine is formed when concentrated $HBr$ is heated with ?

group 17 elements - trends in chemical properties group 17 elements - properties p- block elements-ii p-block elements chemistry

  1. $KMn{O} _{4}$

  2. ${K} _{2}{Cr} _{2}{O} _{7}$

  3. $Mn{O} _{2}$

  4. $All\ of\ these$

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Correct Option: A
Explanation:

When concentrated $HBr$ is heated with $KMnO _4$ then bromine is liberated.The reaction involved is $2KMnO _4+16HBr\longrightarrow 2MnBr _2=2KBr+8H _2O+5Br _2$

The most reactive elements in the halogen group is __________.

group 17 elements - trends in chemical properties group 17 elements - properties p- block elements-ii p-block elements chemistry

  1. Astatine

  2. Iodine

  3. Chlorine

  4. Fluorine

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Correct Option: D
Explanation:

Flourine is the most reactive element in the halogen group. 

This is because it has the smallest radius and most electronegative character.

Which of the following is basic?

group 17 elements - trends in chemical properties group 17 elements - properties p- block elements-ii p-block elements chemistry

  1. ${ F } _{ 2 }$

  2. ${ Cl } _{ 2 }$

  3. ${ Br } _{ 2 }$

  4. ${ I } _{ 2 }$

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Correct Option: D
Explanation:

Down the group, metallic nature increases. If metallic nature increases, basic nature increases. Among halogens, $I _2$ is at bottom and it has high metallic nature than other halogens. So, it is more basic.

Which of the following statements is NOT TRUE?

group 17 elements - trends in chemical properties group 17 elements - properties p- block elements-ii p-block elements chemistry

  1. HF is a stronger acid than HCl

  2. Among Halide ions, iodide is the most powerful reducing agent

  3. Flourine is the only halogen that does NOT show a variable oxidation state

  4. HOCl is a stronger acid than HOBr

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Correct Option: B

The acid characters of these halides are in the order 

group 17 elements - trends in chemical properties group 17 elements - properties p- block elements-ii p-block elements chemistry

  1. 1 < 2 < 3 < 4

  2. 1 < 3 < 2 < 4

  3. 4 < 3 < 2 < 1

  4. 4 < 2 < 3 < 1

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Correct Option: A

Which of the following co exist-

group 17 elements - trends in chemical properties group 17 elements - properties p- block elements-ii p-block elements chemistry

  1. $HI^{-} _{2}$

  2. $HBr _{2}^{-}$

  3. $HF _{2}^{-}$

  4. $HCl _{2}^{-}$

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Correct Option: A

The most covalent halide is:

group 17 elements - trends in chemical properties group 17 elements - properties p- block elements-ii p-block elements chemistry

  1. $Al{F} _{3}$

  2. $Al{Cl} _{3}$

  3. $Al{Br} _{3}$

  4. $Al{I} _{3}$

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Correct Option: D
Explanation:

According to Fajans rule larger the size of anion,more covalent will be the bond . So, according to this most covalent halide is iodide as because it is the least electronegative among all the halides,greater size of halide anion,so in a covalent compound it has the least polarising

The volatility of the Group $17$ elements, chlorine, bromine and iodine, decreases down the group. What is responsible for this?

group 17 elements - trends in chemical properties group 17 elements - properties p- block elements-ii p-block elements chemistry

  1. Bond length in the halogen molecule

  2. Bond strength in the halogen molecule

  3. Electronegativity of the halogen

  4. Number of electrons in the halogen molecule

Show answer
Correct Option: D
Explanation:

$\text{The volatility of the Group 17 elements decrease down the group due to the increse the numnber of electrons.}$