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Trends in halogens

41 questions on Trends in halogens from the p-Block Elements: Groups 17 and 18 chapter: 8 NEET level, 18 JEE Main, 15 JEE Advanced. Each one opens with its answer and solution.

Practice this topic All p-Block Elements: Groups 17 and 18 topics

Which halogen exists as a liquid at room temperature and 1 atm? NEET level
Among the halogens, which one has the most negative electron gain enthalpy? NEET level
The colour of iodine vapour is NEET level
Which of the following is the strongest oxidising agent? NEET level
The correct order of covalent (atomic) radii of the halogens is NEET level
The bond dissociation enthalpy of F2 (158.8 kJ/mol) is lower than that of Cl2 (242.6 kJ/mol) mainly because JEE Main level
The correct order of the magnitude of electron gain enthalpy of the halogens is JEE Main level
The correct order of bond dissociation enthalpy of the halogen molecules is JEE Main level
When fluorine is passed through water, the main products are JEE Main level
Chlorine gas is passed through a hot concentrated solution of NaOH. The products containing chlorine are JEE Main level
Which statement about the reaction of halogens with hydrogen is correct? JEE Main level
Given E deg(F2/F-) = 2.87 V, E deg(Cl2/Cl-) = 1.36 V, E deg(Br2/Br-) = 1.09 V and E deg(I2/I-) = 0.54 V, which reaction is spontaneous under standard conditions... JEE Main level
Hydration enthalpy of F- is the most negative among the halide ions mainly because JEE Main level
Match the halogens (P) F2, (Q) Cl2, (R) Br2, (S) I2 with their colours: (1) violet, (2) reddish brown, (3) pale yellow, (4) greenish yellow. JEE Main level
Select the correct statement(s) about the halogens. JEE Main level
Select the correct statement(s) regarding periodic trends in the halogens. JEE Main level
In the reaction of chlorine with hot concentrated NaOH, 3Cl2 + 6NaOH -> 5NaCl + NaClO3 + 3H2O, the ratio of the number of chlorine atoms oxidised to the number ... JEE Advanced level
Given E deg(Cl2/Cl-) = 1.36 V and E deg(Br2/Br-) = 1.09 V, the standard Gibbs energy change for Cl2 + 2Br- -> 2Cl- + Br2 at 298 K (F = 96500 C/mol) is JEE Advanced level
Under standard conditions in acid solution, which of the following oxidising couples can oxidise Br- and I- but not Cl-? Use E deg(Cl2/Cl-) = 1.36 V, E deg(Br2/... JEE Advanced level
Assertion (A): The electron gain enthalpy of fluorine is less negative than that of chlorine. Reason (R): The small 2p subshell of fluorine causes strong inter-... JEE Advanced level
Chlorine water is added dropwise to a solution of NaI shaken with carbon tetrachloride, and then added in large excess with shaking. The observation in the CCl4... JEE Advanced level
An excess of Cl2 oxidises thiosulfate completely to sulfate, while I2 oxidises it only to tetrathionate, S4O6^2-. The ratio of moles of Cl2 to moles of I2 consu... JEE Advanced level
Fluorine reacts with cold dilute (2 per cent) aqueous NaOH. Which oxygen-containing product forms, and what is the oxidation state of oxygen in it? JEE Advanced level
I2 dissolves much better in aqueous KI than in pure water because I2 + I- <=> I3-. How many lone pairs are present on the central iodine atom of the linear trii... JEE Advanced level
Using E deg(F2/F-) = 2.87 V, E deg(Cl2/Cl-) = 1.36 V, E deg(Br2/Br-) = 1.09 V and E deg(I2/I-) = 0.54 V, select the reaction(s) that are spontaneous under stand... JEE Advanced level
Chlorine gas is passed into (i) cold dilute and (ii) hot concentrated aqueous NaOH. Select the correct statement(s). JEE Advanced level
Bond enthalpies (kJ/mol): H-H 436; F-F 159, Cl-Cl 243, Br-Br 193, I-I 151; H-F 568, H-Cl 431, H-Br 366, H-I 299. For H2(g) + X2(g) -> 2HX(g), select the correct... JEE Advanced level
Among the halogens, which element has the most negative electron gain enthalpy? NEET level
Under standard conditions, chlorine can displace which of the following halogens from aqueous solutions of their sodium salts? NEET level
The F-F bond dissociation enthalpy (159 kJ mol^-1) is lower than that of Cl-Cl (243 kJ mol^-1). The main reason is NEET level
Assertion (A): Fluorine shows no positive oxidation state in its compounds. Reason (R): Fluorine is the most electronegative element and has no d orbitals in it... JEE Main level
Given E deg (V): F2/F- = 2.87, Cl2/Cl- = 1.36, Br2/Br- = 1.09, I2/I- = 0.54. Which reaction is spontaneous under standard conditions? JEE Main level
Using E deg(Cl2/Cl-) = 1.36 V, E deg(Br2/Br-) = 1.09 V and F = 96500 C mol^-1, the standard Gibbs energy change for Cl2 + 2Br- -> 2Cl- + Br2 is JEE Main level
Bond dissociation enthalpies (kJ mol^-1): F2 159, Cl2 243, Br2 193, I2 151. Consider: (i) the order is Cl2 > Br2 > F2 > I2; (ii) the electron gain enthalpy of F... JEE Advanced level
Sodium halides are heated separately with concentrated H2SO4. Select the correct statement(s). JEE Advanced level
Iodine vapour is violet while fluorine is pale yellow. Which explanation is correct? JEE Main level
Select the correct statement(s) about the anomalous behaviour of fluorine. JEE Main level
The enthalpy change for X2(g) + 2e- -> 2X-(aq) is the sum of the bond dissociation enthalpy, twice the electron gain enthalpy and twice the hydration enthalpy o... JEE Advanced level
HF is the weakest hydrohalic acid in water although the H-F bond is the most polar. The chief reason is JEE Main level
Given E deg (V): Cl2/Cl- = 1.36, Br2/Br- = 1.09, I2/I- = 0.54, Fe^3+/Fe^2+ = 0.77, MnO4-/Mn^2+ (acidic) = 1.51. Under standard conditions, which statement(s) is... JEE Advanced level
The electron gain enthalpy of F is less negative than that of Cl mainly because JEE Main level