Tag: group 17 elements - properties

Questions Related to group 17 elements - properties

Which of the following is correct?

chemistry p- block elements-ii group 17 elements - general properties group 17 elements group 17 elements - properties

  1. Iodine is solid

  2. Chlorine is insoluble in water.

  3. Iodine is more reactive than bromine.

  4. Bromine is more reactive than chlorine.

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Correct Option: A
Explanation:

The reason is that the attractive forces between the molecules of these elements increase from top to bottom of the Group.

In iodine, the electrons are so far from the nuclei that the electron clouds can easily distort. The London dispersion forces are strong. So the Iodine is solid.

Hence option A is correct.

Formula of Freon is:

chemistry p- block elements-ii group 17 elements - general properties group 17 elements group 17 elements - properties

  1. $CCl _2F _2$

  2. $COCl _2$

  3. $SO _2Cl _2$

  4. none of these

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Correct Option: A
Explanation:

$CCl _2F _2$ is called as freons or chloro floro carbons.

Hence option A is correct.

Have you ever noticed the fact that two siblings can have different personalities? Even though two people may be members of the same family, it does mean that they will behave in similar ways.
The same thing can be said about elements in a group ("family") on the periodic table. For example, fluorine and iodine are members of the halogen family, but their physical properties are different, as shown in the table below.

Element Melting Point $(^{\circ}C)$ Boiling Point $(^{\circ}C)$
Fluorine $-220$ $-188$
Iodine $+118$ $+184$

Which of the following is the BEST explanation for these differences in melting and boiling point?

chemistry p- block elements-ii group 17 elements - general properties group 17 elements group 17 elements - properties

  1. Fluorine has a higher value for electronegativity than iodine.

  2. The covalent bond in the fluorine molecule is stronger than the covalent bond in the iodine molecule.

  3. Iodine molecules are larger and more polarizable than fluorine molecules.

  4. Fluorine is a nonpolar molecule, but iodine is a polar molecule.

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Correct Option: C
Explanation:

As we move down the group of halogens the size of elements increases thereby increasing the Van der Waal forces; hence boiling and melting point of Iodine is more than Fluorine molecule.

Which is soluble in water :

chemistry p- block elements-ii group 17 elements - general properties group 17 elements group 17 elements - properties

  1. AgCl

  2. AgBr

  3. AgI

  4. AgF

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Correct Option: D
Explanation:

Ionic compounds are soluble in water
In AgF  $F^-$ is small onion with high charge density so less polarisation and less covalent character in the whole group of Ag holdies.  AgF is most Ionic in nature.

Correct order of hydrolysis of hexafluorides is?

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

  1. $TeF _6 > SeF _6 > SF _6$

  2. $ SF _6 > SeF _6 > TeF _6$

  3. $SF _6 > TeF _ > SeF _6$

  4. None of these

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Correct Option: B

Which of the following trihalides on hydrosois produces hypochlorous acid?

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

  1. $PCl _{3}$

  2. $NCl _{3}$

  3. $BiCl _{3}$

  4. $SbCl _{3}$

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Correct Option: B
Explanation:

Hydrolysis of $NCl$ gives $HOCl$ (hypochlorous acid)

${ NCl } _{ 3 }+{ 4H } _{ 2 }O\longrightarrow { N } _{ 4 }OH+3HOCl$

Which of the following can be hydrolysed?

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

  1. $TeF _6$

  2. $NCl _3$

  3. $SF _6$

  4. Both $1$ & $2$

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Correct Option: A
Explanation:

$TeF _6$ canbe easily hydrolysed because of large size of Te central atom and low electronegativity the bond polarity of this bond is more .so, it is more reactive than other compounds like $SF _6$

$TeF _6+6H _2O\longrightarrow H _6TeO _6+6HF$

Which of the following is least stable?

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

  1. $Tl{I} _{3}$

  2. $Tl{F} _{3}$

  3. $Pb{F} _{4}$

  4. $Pb{I} _{4}$

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Correct Option: D

Which is the correct order of decreasing basicity of halide ions?

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

  1. ${I}^{-1}> {Br}^{-}> {Cl}^{-}> {F}^{-}$

  2. ${F}^{-}> {Cl} _{-}> {Br}^{-}> {I}^{-}$

  3. ${Cl}^{-}> {Br}^{-}> {I}^{-}> {F}^{-}$

  4. ${F}^{-}> {Cl} _{-}> {I}^{-}> {Br}^{-}$

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Correct Option: A,B

Which gas use in cooling tube in MRI tube ?

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

  1. He

  2. Ar

  3. $CO _2$

  4. $N _2$

Show answer
Correct Option: A
Explanation:

He gas use as colling agent in super conducting magne