Group 17 - halogens, hydrogen halides, oxoacids and interhalogens — practice questions

Question 1 · difficulty L2 · understanding

A monoatomic anion (A ) has 45 neutrons and 36 electrons. Atomic mass, group in the periodic table and physical state at room temperature of the element (A) respectively are

• A. 80, 17, liquid
• B. 81, 16, solid
• C. 80,16, gas
• D. 81, 15, gas

Question 2 · difficulty L2 · understanding

The Lassiagne's extract is boiled with dil $$\mathrm{HNO}_3$$ before testing for halogens because,

• A. Silver halides are soluble in $$\mathrm{HNO}_3$$.
• B. $$\mathrm{AgCN}$$ is soluble in $$\mathrm{HNO}_3$$.
• C. $$\mathrm{Na}_2 \mathrm{S}$$ and $$\mathrm{NaCN}$$ are decomposed by $$\mathrm{HNO}_3$$.
• D. $$\mathrm{Ag}_2 \mathrm{S}$$ is soluble in $$\mathrm{HNO}_3$$.

Question 3 · difficulty L2 · understanding

Identify the incorrect pair from the following :

• A. Fluoroapatite $$-3 \mathrm{Ca}_3\left(\mathrm{PO}_4\right)_2 \cdot \mathrm{CaF}_2$$
• B. Carnallite $$-\mathrm{KCl} \cdot \mathrm{MgCl}_2 \cdot 6 \mathrm{H}_2 \mathrm{O}$$
• C. Cryolite $$-\mathrm{Na}_3 \mathrm{AlF}_6$$
• D. Fluorspar $$-\mathrm{BF}_3$$

Question 4 · difficulty L2 · understanding

Element not showing variable oxidation state is :

• A. Bromine
• B. Iodine
• C. Chlorine
• D. Fluorine

Question 5 · difficulty L2 · understanding

Given below are two statements: Statement I : Chlorine can easily combine with oxygen to form oxides; and the product has a tendency to explode. Statement II : Chemical reactivity of an element can be determined by its reaction with oxygen and halogens. In the light of the above statements, choose the correct answer from the options given below :

• A. Statement I is true but Statement II is false
• B. Both the Statements I and II are false
• C. Statement I is false but Statement II is true
• D. Both the Statements I and II are true

Question 6 · difficulty L2 · understanding

The interhalogen compound formed from the reaction of bromine with excess of fluorine is a :

• A. hypohalite
• B. halate
• C. perhalate
• D. halite

Question 7 · difficulty L2 · understanding

Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R. Assertion A : Fluorine forms one oxoacid. Reason R : Fluorine has smallest size amongst all halogens and is highly electronegative. In the light of the above statements, choose the most appropriate answer from the options given below :

• A. Both A and R are correct and R is the correct explanation of A.
• B. Both A and R are correct but R is NOT the correct explanation of A.
• C. A is correct but R is not correct.
• D. A is not correct but R is correct.

Question 8 · difficulty L2 · understanding

White precipitate of AgCl dissolves in aqueous ammonia solution due to formation of :

• A. [Ag(NH 3 ) 4 ]Cl 2
• B. [Ag(Cl) 2 (NH 3 ) 2 ]
• C. [Ag(NH 3 ) 2 ]Cl
• D. [Ag(NH 3 )Cl]Cl

Question 9 · difficulty L2 · understanding

Which one of the following correctly represents the order of stability of oxides, X 2 O; (X = halogen)?

• A. Br > Cl > I
• B. Br > I > Cl
• C. Cl > I > Br
• D. I > Cl > Br

Question 10 · difficulty L2 · understanding

Number of Cl = O bonds in chlorous acid, chloric acid and perchloric acid respectively are :

• A. 3, 1 and 1
• B. 4, 1 and 0
• C. 1, 1 and 3
• D. 1, 2 and 3