Tag: group 17 elements - trends in chemical properties

Quizzes (0) Questions (77)

Questions Related to group 17 elements - trends in chemical properties

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

Which of the following is most acidic?

  1. $HClO$
  2. $HClO _2$
  3. $HClO _3$
  4. $HClO _4$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

As the oxidation number of chlorine(non metal) increases in the given acids the acidic nature of the compound increases. So the oxidation numbers of chlorine in the given compounds are $+1,+3,5,+7$ respectively.

So the acidic nature of $HClO _4$ is high.
Hence option D is correct.

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

A one litre flask is full of brown bromine vapour. Intensity of brown colour vapour will not decrease a appreciable amount on adding to flask some of:

  1. Piece of marble

  2. Carbon disulphide

  3. Carbon tetrachloride

  4. Animal charcoal powder
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A one litre flask is full of brown bromine vapour. Intensity of brown colour vapour will not decrease a appreciable amount on adding to flask some of Piece of marble.

Hence option A is correct.

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

Fluorine is stronger oxidising agent than chlorine in water. The factor which is not responsible for that:

  1. Heat of dissociation

  2. e-affinity

  3. Heat of hydration

  4. Ionisation potential
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Affinity do not have any relation with the efficiency of oxidizing ability.

Hence option A is correct.

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

Which of the following reactions are not possible?

  1. $2NaCl+F _2$ $\longrightarrow \ $ $2NaF+Cl _2$
  2. $2NaCl+Br _2$ $\longrightarrow \ $ $2NaBr+Cl _2$
  3. $2NaF+Cl _2$ $\longrightarrow \ $ $2NaCl+F _2$
  4. $2NaBr+Cl _2$ $\longrightarrow \ $ $2NaCl+Br _2$
Reveal answer Fill a bubble to check yourself
B,C Correct answer
Explanation

Option B and C reactions are not possible because the bromine do not displace chlorine and chlorine do not displace florine as chlorine and florine are most stable than bromine and chorine in their compounds respectively.

Hence option B,C are correct.

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

Iodine is oxidised by fuming nitric acid. The major product formed is:

  1. $HI$
  2. $HIO _2$
  3. $HIO _3$
  4. $HIO _4$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Reaction of iodine with fuming nitric acid is given by 

${ I } _{ 2 }+{ 10HNO } _{ 3 }\longrightarrow { 2HIO } _{ 3 }+{ 10NO } _{ 2 }+{ 4H } _{ 2 }O$.
So, the major product formed will be ${ HIO } _{ 3 }$.
So, correct answer is option $C$.

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

Which one of the following orders is not in accord with the property stated against it?

  1. $F _{2} > Cl _{2} > Br _{2}> I _{2}$ ; Oxidising power
  2. $HI > HBr > HCl > HF$ ; Acidic property in water
  3. $F _{2} > Cl _{2}> Br _{2} > I _{2}$; Electronegativity
  4. $F _{2}> Cl _{2} > Br _{2} > I _{2}$ ; Bond dissociation energy
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The bond dissociation energies of $I _2$, $Br _2$ and $Cl _2$ increase in the following order:

$I _2$ < $Br _2$ < $Cl _2$ 

In case of $F _2$, the bond dissociation energy is lower than that of $Cl _2$ and $Br _2$ because of the existence of strong inter-electronic repulsions owing to its small size. The overall trend of bond dissociation energies is thus as follows:
$I _2$ < $F _2$ < $Br _2$ < $Cl _2$ 

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

Which of the following compounds is used as a sedative (sleep-inducing substance)?

  1. Sodium Chloride

  2. Potassium bromide

  3. Calcium Chloride

  4. Phosphorous trichloride
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Potassium bromide ($KBr$) is a salt, widely used as an anticonvulsant and a sedative in the late 19th and early 20th centuries.

Its action is due to the bromide ion (sodium bromide is equally effective).
Hence option B is correct answer.

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

The following acids have been arranged in order of decreasing acid strength. Identify the correct order.
I. HOCl


II. HOBr 

III. HOI

  1. I > II > III

  2. II > I > III

  3. III > II > I

  4. I > III > II
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

As we move down the group acidic strength decreases as more is the electronegativity of the central atom the shared pair of $e^-$ will be more towards the central atom; resulting in the release of Hydrogen easy.