Tag: chemistry

Questions Related to chemistry

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

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Correct Option: D
Explanation:

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

State whether the given statement is true or false:

In Japan Sunami, there has been increase in radioactive iodine content in salt.
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:

The given statement is True. 
In Japan Sunami, there has been increase in radioactive iodine content in salt.
Traces of iodine are found in mineral deposits. Iodine also finds its way into the animal system as thyroxin in thyroid glands.

In very recent Sunami in Japan, food materials were banned as they were contaminated with radioactivity . Which of the following was found to have radioactive beyond prescribed limit ?

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

  1. F

  2. Cl

  3. I

  4. At

Show answer
Correct Option: C
Explanation:

Tokyo, the city first reported a spike of radioactive iodine in its water supply on March 23, 2011 at levels below the limit for adults but above the threshold of safety for infants; since then, iodine levels in Tokyo's water have declined below both thresholds. 


Above-limit levels of radioactive iodine and cesium have also been found in milk and vegetables in seven prefectures in Japan. 

Hence,option C is correct.


$O _2^+PtF _6^-$ is an orange-coloured compound.

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:

Dioxygenyl hexafluoroplatinate $(O _2^+[PtF _6]^-)$ is a orange coloured salt. It is a solid and is used to prepare co-ordination complexes.