Tag: group 17 elements - properties

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

Statement $1$: Element $Z$ with an electronic configuration of $1s^{2} 2s^{2} 2p^{5}$ can be expected to form the compound $MgZ _{2}$.
Statement $2$: Each atom of $Z$ needs two electrons to fill its valence shell.

  1. Both Statement $1$ and Statement $2$ are correct and Statement 2 is the correct explanation of Statement $1$
  2. Both Statement $1$ and Statement $2$ are correct, but Statement $2$ is NOT the correct explanation of Statement $1$
  3. Statement $1$ is correct, but Statement $2$ is not correct
  4. Statement $1$ is not correct, but Statement $2$ is correct
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Element Z has electronic configuration ${1s}^2 2s^2 2p^{5}$ , its belongs to 17th group so, it can form compound $MgZ _2$.

Its valency will be one.
It requires 9 elctron to fill its valence shell or it has already 9 electrons. So, statement 2 is wrong.
 

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

Treatment of the dry solid with a mild oxidizing agent produces a purple solid having formula _______.

  1. $N _2$
  2. $KI$
  3. $CCl _4$
  4. $AgNO _3$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Iodine can be displaced from potassium iodide if a more reactive element is made to react with potassium iodide. In the presence of a mild oxidising agent, the iodine ions are oxidised to $I _2$. Iodine is purple in colour.

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

Identify the gas that would form when hydrobromic acid is combined with nickel (II) sulfide.

  1. $NiBr _{2}$
  2. $H _{2}S$
  3. $HBr$
  4. $NiS$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The gas that would form when hydrobromic acid is combined with nickel (II) sulfide is $H _2S$

$2 HBr(aq) + NiS(s)\rightarrow H _2S + NiBr _2$.
Hence option B 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 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.