Tag: group 17 elements - properties

Questions Related to group 17 elements - properties

Which of the following non-metals sublimes on heating?

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

  1. Fluorine

  2. Chlorine

  3. Bromine

  4. Iodine

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Correct Option: D
Explanation:

Iodine crystals sublime because though there are covalently bonded within the molecule holding two iodine atoms together, only Van der Waals' forces exist between the iodine molecules. Van der Waal's forces are very weak interactions between molecules of a substance hence the Iodine molecules can escape from the solid structure easily.

Which of the following halides is inert towards hydrolysis at room temperature? 

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

  1. ${ SiCl } _{ 4 }$

  2. ${ PCl } _{ 3 }$

  3. ${ NCl } _{ 3 }$

  4. ${ NF } _{ 3 }$

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Correct Option: D
Explanation:
Hydrolysis takes place through the coordination with lone pair of electron of water molecule. But neither nitrogen, nor fluorine have vacant d-orbital for coordination. Hence $N{F} _{3}$ behaves as inert towards hydrolysis.

Elements in the halogen family belonging to 17th group in the periodic table show similarity in their properties .

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

  1. True

  2. False

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Correct Option: A
Explanation:

Similar properties:-

(i) Group 17 elements have high electronegativity than other groups.
(ii) They have high $e^-$ affinity than other groups.
(iii) Group 17 has high $e^-$ gain enthalpy.

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