213 + Interview Questions in THE-HALOGEN-FAMILY IN GENERAL AWARENESS Page 3 InterviewSolution

101.	Which among the following elements of 3rd period shows maximum tendency of forming `dpi-ppi` bond ?A. ChlorineB. SiliconC. PhosphorusD. Sulphur
Answer» Correct Answer - A Among the given elements, Cl has maximum tendency of `ppi-dpi` bonding. On moving across the period, nuclear charge increases and more s, p electrons are added. Due to incomplete shielding of nuclear charge, the atomic size and so the size of 3d-orbitals decreases from `Si to P to S to Cl`. Decrease in size of 3d-orbitals leads to stronger `ppi-dpi` overlap.

Discussion

102.	Which of the following set has the strongest tendency to form anions?A. Ga, In , TlB. Na, Mg, AlC. N,O,FD. V,Cr,Mn
Answer» Correct Answer - C Elements with high electron affinity form anions most easily. Thus, N, O and F with highest electron affinities form anions very easily

Discussion

103.	Which of the following halogens has a tendency to exist as positively charged ions ?A. IodineB. BromineC. ChlorineD. Fluorine
Answer» Correct Answer - A Due to its lowest ionisation energy value, iodine has a tendency to form `I^+` ion as it forms compounds like IC l, ICN etc. which in molten state conduct electricity showing the existence of `I^+` cation

Discussion

104.	The tendency to form the anion `X^(-)` is greatest withA. FluorineB. ChlorineC. BromineD. Iodine.
Answer» Correct Answer - B Chlorine has the highest electron affinity.

Discussion

105.	`Cl_2O` is best prepared by passing dryA. chlorine gas over hot HgOB. hydrogen chloride and oxygen over hot silver oxideC. hydrogen chloride over phosphorus pentoxideD. chlorine and oxygen over hot silver chlorate
Answer» Correct Answer - A `2Cl_2 +2HgO overset(300^@C )to HgCl_2.HgO + Cl_2O`

Discussion

106.	Which of the hydrogen halide is liquid at `25^@C` ?A. HFB. HClC. HBrD. none of these
Answer» Correct Answer - D Only HF is liquid which has boiling point `19.5^@C`

Discussion

107.	The mixture of concentrated `HCl` and `HNO_(3)` made in `3:1` ratio containsA. `ClO_2`B. NOClC. `NCl_3`D. `N_2O_4`
Answer» Correct Answer - B `3HCl+ HNO_3 to NOCl+2H_2O +2Cl`

Discussion

108.	Hydrochloric acid at `25^@C` isA. Ionic and liquidB. Covalent and liquidC. Ionic and gasD. None of the above.
Answer» Correct Answer - D Hydrochloric acid at `25^@C` is a gas. In anhydrous state it is a polar covalent compound

Discussion

109.	Concentrated hydrochloric acid when kept in open air sometimes produces a cloud of white fumes. The explanation for it is that :A. due to strong affinity for water, concentrated hydrochloric acid pulls moisture of air towards itself. This moisture forms droplets of water and hence the cloud.B. concentrated hydrochloric acid emits strongly smelling HCl gas all the timeC. oxygen in air reacts with the emitted HCl gas to form a cloud of chlorine gasD. strong affinity of HCl gas for moisture in air results in formation of droplets of liquid solution which appears like a cloudy smoke.
Answer» Correct Answer - D Concentrated hydrochloric acid produces vapours of HCl. As HCl has strong affinity for moisture it results in the formation of droplets of liquid solution which appears like a cloudy smoke.

Discussion

110.	Dilute hydrochloric acid solution cannot be concentrated by boiling beyondA. `11%`B. `33%`C. `44%`D. `22%`
Answer» Correct Answer - D HCl forms a constant boiling mixture (azeotropic solution) with water having a composition of 22% HCl (by weight) and rest is water.

Discussion

111.	Boiling points of the hydrogen halidesA. Increase regularly in order of relative molecular massB. Decrease sharply from HF to HCl and then increasesC. Decrease regularly in order of relative molecular massD. Increase sharply from HF to HCI and then decrease regularly with increase of relative molecular mass.
Answer» Correct Answer - B The increasing order of boiling point is HCl lt HBrlt HI lt HF Boiling point increases with increase in atomic weight of halogen due to increase in the van der Waals forces. However, boiling point of HF is highest due to presence of hydrogen bonding.

Discussion

112.	The correct order of the thermal stability of hydrogen halides `(H-X)` isA. HI gt HBr gt HCl gt HFB. HF gt HCl gt HBr gtHIC. HCI gt HF gt HBr gt HD. HI gt HCl gt HF gt HBr
Answer» Correct Answer - B Correct order of thermal stability is HF gt HCl gt HBr gt HI

Discussion

113.	For the reaction `X_2 + (aq) + 2e^(-) to 2X^(-) (aq)` the value of `E_("red")^@` is highestA. `F_2`B. `Cl_2`C. `Br_2`D. `I_2`
Answer» Correct Answer - A `F_2` is the strongest oxidizing agent.

Discussion

114.	The least soluble halogen in water isA. FluorineB. IodineC. ChlorineD. Bromine
Answer» Correct Answer - B `I_2` cannot decompose water as well as it does not readily dissolve in water.

Discussion

115.	`Na_2S_2O_3` is oxidised by `I_2` toA. `Na_2S`B. `Na_2SO_4`C. `NaHSO_4`D. `Na_2S_4O_6`
Answer» Correct Answer - D `2Na_2S_2O_3 + I_2 to 2NaI + Na_2S_4 O_6`

Discussion

116.	Which of the following has maximum vapour pressure?A. HClB. HBrC. HID. HF
Answer» Correct Answer - A Because HCI has the minimum boiling points.

Discussion

117.	Which of the following interhalogens can not exist ?A. `CIF_5`B. `ClI_5`C. `IC l_2^(-)`D. `IF_4^(-)`
Answer» Correct Answer - B `ClI_5` cannot exist because chlorine can not coordinate to five large size I atoms.

Discussion

118.	Which of the following interhalogens does not exist ?A. `ClF`B. `ClF_2`C. `ClF_3`D. `ClF_5`
Answer» Correct Answer - B Halogens do not show even covalency i.e. the number of half filled atomic orbitals possible can be 1, 3, 5, 7

Discussion

119.	Which one of the following reacts with glass ?A. `H_2SO_4`B. HFC. `HNO_3`D. `K_2Cr_2O_7`
Answer» Correct Answer - B HF(aq) reacts with glass. Ordinary glass is a mixture of sodium silicate and calcium silicate. HF reacts with these silicates to form soluble hexafluoride `Na_2SiO_3(s)+6HF(aq) to Na_2[SiF_6](aq)+3 H_2O(l)` `CaSiO_3(s) + 6HF(aq) to Ca[SiF_6](aq) + 3H_2O(l) `

Discussion

120.	Which of the following attacks glass?A. HClB. HFC. HID. HBr
Answer» Correct Answer - B `BaO_2 (-1) lt KO_2 (-1/2) lt O_3 (0) lt OF_2 (+2)`.

Discussion

121.	The heating of which of the following gives pure chlorineA. `MnO_2 + HCl`B. Bleaching powder + HClC. `PtCl_4`D. `NaCl + MnO_2 + H_2SO_4`
Answer» Correct Answer - C Pure chlorine is obtained by heating dry `PtCl_4` or `AuCl_3` `PtCl_4 overset(374^@C)toCl_2+PtCl_2overset(582^@)toPt+2Cl_2` `2AuCl_3 overset(175^@C)to 2Cl_2 + 2AuCl overset(185^@C)to2Au + Cl_2`

Discussion

122.	Which of the following is soluble in water ?A. AgFB. AgClC. AgBrD. None.
Answer» Correct Answer - A Out of all the silver halides only AgF is soluble in water.

Discussion

123.	Passage of `CO_2` through suspension of bleaching powder producesA. Calcium chlorideB. Chlorine gasC. Nothing but simple absorption of `CO_2` occursD. `CO_2` escapes out as such.
Answer» Correct Answer - B `CaOCl_2 + CO_2 to CaCO_3 + Cl_2`

Discussion

124.	The hybrid state of Br in `BrF_5` isA. `sp^3d`B. `sp^3d^2`C. `sp^3`D. `dsp^2`
Answer» Correct Answer - B `sp^3d^2` hybridisation and it has square pyramidal shape

Discussion

125.	Charge distribution in iodine monochloride is best represented asA. `I^(+) Cl^(-)`B. `I^(delta+) Cl^(delta-)`C. `I^(-) , Cl^(+)`D. `I^(delta-), Cl^(delta+)`
Answer» Correct Answer - B `I^(delta+) - Cl^(delta-)` Chlorine is more electronegative than iodine

Discussion

126.	Which statement is correct about halogens ?A. They are all diatomic and form univalent ionsB. They are all capable of exhibiting several oxidation statesC. They are all diatomic and form divalent ionsD. They can mutually displace each other from the solution of their compounds with metals.
Answer» Correct Answer - A All halogens are diatomic (e.g., `F_2, Cl_2, Br_2, and I_2)` and all of them form univalent ions `(F^(-), Cl^(-), Br^(-) and I^(-))`.

Discussion

127.	The species having pyramidal shape isA. `SO_3`B. `BrF_5`C. `SiO_3^(2-)`D. `OsF_2`
Answer» Correct Answer - D `SO_3` is planar, `BrF_3` (T shaped) `SF_4` is trigonal bipyramidal and `XeF_4` is square planar.

Discussion

128.	Which of the following is correct about the reaction ? `3NaClO overset("heat")to NaClO_3 + 2NaCl`A. It is a disproportionation reactionB. Oxidation number of Cl decreases as well as increases in this reactionC. This reaction is used for the manufacture of halatesD. All of the above.
Answer» Correct Answer - D `3Naoverset(+1)(Cl)O overset(Delta)to Naoverset(+5)(Cl)O_3 +2Naoverset(-1)(Cl)` All the three statements are correct.

Discussion

129.	Bromine is obtained on commercial scale fromA. CalicheB. CarnalliteC. Common saltD. Cryolite
Answer» Correct Answer - B The mother liquor left after the crystallisation of KCl from carnallite `(KCl.MgCl_2. 6H_2O)` contains about 0.25% of bromine in the form of `MgBr_2` and KBr

Discussion

130.	Iodine is liberated from sodium iodate by reacting withA. dil. `H_2SO_4`B. `KMnO_4`C. `NaHSO_3`D. HCl
Answer» Correct Answer - C This can be done with conc. `H_2SO_4 or NaHSO_3` `2 NaIO_3 + 5 NaHSO_3 to 3NaHSO_4 + 2 Na_2SO_4+I_2+ H_2O`

Discussion

131.	Which of the following aqueous solution is colourless but gives yellow precipitate on adding lead acetate to itA. `K_2Cr_2O_4` solnB. KI soln.C. `AgNO_3` solnD. NaCl soln.
Answer» Correct Answer - B

Discussion

132.	Which one of the hydracid does not form any precipitate with `AgNO_(3)`?A. HFB. HClC. HBrD. HI
Answer» Correct Answer - A HF gives no precipitate since AgF is formed which is soluble in water. Others give precipitates with `AgNO_3`.

Discussion

133.	Which of the following is the strongest oxidising agent ?A. HOClB. `HClO_2`C. `HClO_3`D. `HClO_4`
Answer» Correct Answer - A HOCI is the strongest oxidising agent

Discussion

134.	Mark the strongest reducing agent.A. `H_2F_2`B. HClC. HBrD. HI.
Answer» Correct Answer - D In H-I, due to larger size of Iodine, the bond is weaker and breaks easily to give hydrogen and is strongest reducing agent.

Discussion

135.	Which of the following has greatest reducing power?A. HIB. HBrC. HClD. HF
Answer» Correct Answer - A HI is the strongest reducing agent. It is due to less bond dissociation energy of H-I.

Discussion

136.	Which of the following belongs to the halogen family?A. FranciumB. PoloniumC. RadiumD. Astatine.
Answer» Correct Answer - D Astatine belongs to the halogen family (group 17).

Discussion

137.	The type of bonding in HCl molecule isA. Pure covalentB. Polar covalentC. Highly polarD. H-bonding
Answer» Correct Answer - B The covalent bond in `H^(delta+) - Cl^(delta -)` is polar in nature. This is due to the appreciable electronegativity difference of H and Cl.

Discussion

138.	Hydrogens bonding does not play any role in boiling ofA. `NH_3`B. `H_2O`C. HID. `C_2H_5OH`
Answer» Correct Answer - C H-bonding is mainly shown by three elements F , O and N. As such H-bonding does not play any role in boiling of HI.

Discussion

139.	`Br^(-)` is converted into `Br_(2)` by usingA. `Cl_2`B. Conc. HClC. HBrD. `H_2S`
Answer» Correct Answer - A `Br^(-) +Cl_2 to 2Cl^(-) + Br_2` Since `Cl_2` can displace `Br^-` ion

Discussion

140.	Iodine flakes when rubbed with liquor ammonia give dark brown ppt. ofA. `NI_3`B. `NH_4I`C. `NI_3.NH_3`D. `NH_4.NI_3`
Answer» Correct Answer - C `2NH_3 + 3I_2 to NI_3. NH_3 + 3HI`

Discussion

141.	Iodine is formed when potassium iodi9de reacts with a solution ofA. `ZnSO_4`B. `CuSO_4`C. `FeSO_4`D. `(NH_4)_2SO_4`
Answer» Correct Answer - B `CuSO_4 + 2KI to Cu I_2 + K_2SO_4` `2Cu I_2 to 2Cu I + I_2`

Discussion

142.	Iodine readily dissolves in potassium iodide solution givingA. `I^-`B. `KI_2`C. `KI_2^-`D. `KI_3`
Answer» Correct Answer - D `l_2` is more soluble in an aqueous solution of KI than in pure water. It is due to the formation of polyhalide (triiodide, `I_3^-` ion). `KI(aq) +I_2(s)to KI_3 (aq) KI_3 (aq) to K^(+) (aq) + I_3^(-)(aq) `

Discussion

143.	When `Cl_2` is passed through hot and concentrated caustic soda a mixture of the product isA. NaCl and bleaching powderB. NaCl and sodium hypochloriteC. Sodium hypochlorite and bleaching powderD. NaCl and sodium chlorate.
Answer» Correct Answer - D `6NaOH + Cl_2 to 5NaCl + NaClO_3 + 3H_2O`

Discussion

144.	Which one of the following halogen liberates oxygen, when passed through hot concentrated KOH solution ?A. `I_2`B. `Cl_2`C. `Br_2`D. `F_2`
Answer» Correct Answer - D `2F_2 + 4KOH to 4KF +O_2 + 2H_2O` Some `O_3` is also produced.

Discussion

145.	The element which liberated `O_2` from water isA. PB. NC. FD. I
Answer» Correct Answer - C `2F_2+2H_2O to 4HF +O_2` `3F_2 +3H_2O to 6HF + 2O_3` `F_2` reacts with water to produce `O_2 and O_3`.

Discussion

146.	The correct increasing order of bond dissociation energy for `N_2, O_2, F_2, Cl_2` isA. `N_2 lt O_2 lt F_2 lt Cl_2`B. `F_2 lt Cl_2 lt O_2 lt N_2`C. `F_2 lt Cl_2 lt N_2 lt O_2`D. `N_2 lt Cl_2 lt F_2 lt O_2`
Answer» Correct Answer - B Bond dissociation energy of `F_2` is less than `Cl_2` `F_2 lt Cl_2` Bond dissociation energies of `O_2` (O=O) and `N_2(N = N)` are more than `Cl_2` or `F_2` which contains only single bonds. Out of `N_2` (with a triple bond) and `O_2` (with a double bond), bond dissociation energy of `N_2` is more than `O_2`. Therefore correct order is : `F_2 lt Cl_2 lt O_2 lt N_2`

Discussion

147.	The halogen which gives `O_2` with hot conc. NaOH isA. `I_2`B. `Br_2`C. `Cl_2`D. `F_2`
Answer» Correct Answer - D Only `F_2` gives `O_2` with hot conc. NAOH `4NaOH + 2F_2 to 2NaF + 2H_2O + O_2`

Discussion

148.	Halogen with lowest bond dissociation energy isA. `F_2`B. `Br_2`C. `Cl_2`D. All have nearly equal bond energies.
Answer» Correct Answer - A The bond dissociation energy of `F_2` is lower than even `Br_2` and `Cl_2`. This is due to repulsions between non-bonding electron pairs.

Discussion

149.	The high reactivity of fluorine is due toA. weakness of F-F bondB. very high oxidising power of fluorineC. high electronegativity of fluorineD. all the three reasons (A), (B) and (C).
Answer» Correct Answer - D

Discussion

150.	Fluorine is stronger oxidising agent. This is attributed to many factors exceptA. Heat of dissociationB. Reduction potentialC. Ionisation potentialD. Heat of hydration.
Answer» Correct Answer - C

Discussion

Explore topic-wise InterviewSolutions in .

Which among the following elements of 3rd period shows maximum tendency of forming `dpi-ppi` bond ?A. ChlorineB. SiliconC. PhosphorusD. Sulphur

Which of the following set has the strongest tendency to form anions?A. Ga, In , TlB. Na, Mg, AlC. N,O,FD. V,Cr,Mn

Which of the following halogens has a tendency to exist as positively charged ions ?A. IodineB. BromineC. ChlorineD. Fluorine

The tendency to form the anion `X^(-)` is greatest withA. FluorineB. ChlorineC. BromineD. Iodine.

`Cl_2O` is best prepared by passing dryA. chlorine gas over hot HgOB. hydrogen chloride and oxygen over hot silver oxideC. hydrogen chloride over phosphorus pentoxideD. chlorine and oxygen over hot silver chlorate

Which of the hydrogen halide is liquid at `25^@C` ?A. HFB. HClC. HBrD. none of these

The mixture of concentrated `HCl` and `HNO_(3)` made in `3:1` ratio containsA. `ClO_2`B. NOClC. `NCl_3`D. `N_2O_4`

Hydrochloric acid at `25^@C` isA. Ionic and liquidB. Covalent and liquidC. Ionic and gasD. None of the above.

Dilute hydrochloric acid solution cannot be concentrated by boiling beyondA. `11%`B. `33%`C. `44%`D. `22%`

The correct order of the thermal stability of hydrogen halides `(H-X)` isA. HI gt HBr gt HCl gt HFB. HF gt HCl gt HBr gtHIC. HCI gt HF gt HBr gt HD. HI gt HCl gt HF gt HBr

For the reaction `X_2 + (aq) + 2e^(-) to 2X^(-) (aq)` the value of `E_("red")^@` is highestA. `F_2`B. `Cl_2`C. `Br_2`D. `I_2`

The least soluble halogen in water isA. FluorineB. IodineC. ChlorineD. Bromine

`Na_2S_2O_3` is oxidised by `I_2` toA. `Na_2S`B. `Na_2SO_4`C. `NaHSO_4`D. `Na_2S_4O_6`

Which of the following has maximum vapour pressure?A. HClB. HBrC. HID. HF

Which of the following interhalogens can not exist ?A. `CIF_5`B. `ClI_5`C. `IC l_2^(-)`D. `IF_4^(-)`

Which of the following interhalogens does not exist ?A. `ClF`B. `ClF_2`C. `ClF_3`D. `ClF_5`

Which one of the following reacts with glass ?A. `H_2SO_4`B. HFC. `HNO_3`D. `K_2Cr_2O_7`

Which of the following attacks glass?A. HClB. HFC. HID. HBr

The heating of which of the following gives pure chlorineA. `MnO_2 + HCl`B. Bleaching powder + HClC. `PtCl_4`D. `NaCl + MnO_2 + H_2SO_4`

Which of the following is soluble in water ?A. AgFB. AgClC. AgBrD. None.

Passage of `CO_2` through suspension of bleaching powder producesA. Calcium chlorideB. Chlorine gasC. Nothing but simple absorption of `CO_2` occursD. `CO_2` escapes out as such.

The hybrid state of Br in `BrF_5` isA. `sp^3d`B. `sp^3d^2`C. `sp^3`D. `dsp^2`

Charge distribution in iodine monochloride is best represented asA. `I^(+) Cl^(-)`B. `I^(delta+) Cl^(delta-)`C. `I^(-) , Cl^(+)`D. `I^(delta-), Cl^(delta+)`

Which statement is correct about halogens ?A. They are all diatomic and form univalent ionsB. They are all capable of exhibiting several oxidation statesC. They are all diatomic and form divalent ionsD. They can mutually displace each other from the solution of their compounds with metals.

The species having pyramidal shape isA. `SO_3`B. `BrF_5`C. `SiO_3^(2-)`D. `OsF_2`

Which of the following is correct about the reaction ? `3NaClO overset("heat")to NaClO_3 + 2NaCl`A. It is a disproportionation reactionB. Oxidation number of Cl decreases as well as increases in this reactionC. This reaction is used for the manufacture of halatesD. All of the above.

Bromine is obtained on commercial scale fromA. CalicheB. CarnalliteC. Common saltD. Cryolite

Iodine is liberated from sodium iodate by reacting withA. dil. `H_2SO_4`B. `KMnO_4`C. `NaHSO_3`D. HCl

Which of the following aqueous solution is colourless but gives yellow precipitate on adding lead acetate to itA. `K_2Cr_2O_4` solnB. KI soln.C. `AgNO_3` solnD. NaCl soln.

Which one of the hydracid does not form any precipitate with `AgNO_(3)`?A. HFB. HClC. HBrD. HI

Which of the following is the strongest oxidising agent ?A. HOClB. `HClO_2`C. `HClO_3`D. `HClO_4`

Mark the strongest reducing agent.A. `H_2F_2`B. HClC. HBrD. HI.

Which of the following has greatest reducing power?A. HIB. HBrC. HClD. HF

Which of the following belongs to the halogen family?A. FranciumB. PoloniumC. RadiumD. Astatine.

The type of bonding in HCl molecule isA. Pure covalentB. Polar covalentC. Highly polarD. H-bonding

Hydrogens bonding does not play any role in boiling ofA. `NH_3`B. `H_2O`C. HID. `C_2H_5OH`

`Br^(-)` is converted into `Br_(2)` by usingA. `Cl_2`B. Conc. HClC. HBrD. `H_2S`

Iodine flakes when rubbed with liquor ammonia give dark brown ppt. ofA. `NI_3`B. `NH_4I`C. `NI_3.NH_3`D. `NH_4.NI_3`

Iodine is formed when potassium iodi9de reacts with a solution ofA. `ZnSO_4`B. `CuSO_4`C. `FeSO_4`D. `(NH_4)_2SO_4`

Iodine readily dissolves in potassium iodide solution givingA. `I^-`B. `KI_2`C. `KI_2^-`D. `KI_3`

When `Cl_2` is passed through hot and concentrated caustic soda a mixture of the product isA. NaCl and bleaching powderB. NaCl and sodium hypochloriteC. Sodium hypochlorite and bleaching powderD. NaCl and sodium chlorate.

Which one of the following halogen liberates oxygen, when passed through hot concentrated KOH solution ?A. `I_2`B. `Cl_2`C. `Br_2`D. `F_2`

The element which liberated `O_2` from water isA. PB. NC. FD. I

The correct increasing order of bond dissociation energy for `N_2, O_2, F_2, Cl_2` isA. `N_2 lt O_2 lt F_2 lt Cl_2`B. `F_2 lt Cl_2 lt O_2 lt N_2`C. `F_2 lt Cl_2 lt N_2 lt O_2`D. `N_2 lt Cl_2 lt F_2 lt O_2`

The halogen which gives `O_2` with hot conc. NaOH isA. `I_2`B. `Br_2`C. `Cl_2`D. `F_2`

Halogen with lowest bond dissociation energy isA. `F_2`B. `Br_2`C. `Cl_2`D. All have nearly equal bond energies.

The high reactivity of fluorine is due toA. weakness of F-F bondB. very high oxidising power of fluorineC. high electronegativity of fluorineD. all the three reasons (A), (B) and (C).

Fluorine is stronger oxidising agent. This is attributed to many factors exceptA. Heat of dissociationB. Reduction potentialC. Ionisation potentialD. Heat of hydration.