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Chlorine and its reactions

42 questions on Chlorine and its reactions from the p-Block Elements: Groups 17 and 18 chapter: 9 NEET level, 17 JEE Main, 16 JEE Advanced. Each one opens with its answer and solution.

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

In the Deacon process for chlorine, hydrogen chloride is oxidised by air at about 723 K in the presence of the catalyst NEET level
In the reaction MnO2 + 4HCl -> MnCl2 + Cl2 + 2H2O, the oxidising agent and the change in its oxidation state are NEET level
Chlorine reacts with cold dilute sodium hydroxide to give NEET level
Chlorine reacts with hot concentrated sodium hydroxide to give NEET level
The bleaching action of moist chlorine on coloured vegetable matter is due to NEET level
When excess ammonia reacts with chlorine, the products are NEET level
2KMnO4 + 16HCl -> 2KCl + 2MnCl2 + 5Cl2 + 8H2O. The number of moles of Cl2 evolved per mole of KMnO4 is JEE Main level
Sodium thiosulphate is used as an antichlor because chlorine oxidises thiosulphate completely to sulphate (as HSO4-) and itself goes to chloride. The number of ... JEE Main level
Chlorine water is added dropwise to potassium iodide solution containing starch. First a blue colour appears. On adding a large excess of chlorine water the blu... JEE Main level
Heated iron reacts with dry chlorine, and iron also dissolves in dilute hydrochloric acid. The iron chlorides formed are respectively JEE Main level
Benzene reacts with excess chlorine in bright sunlight (no halogen carrier) mainly to give JEE Main level
Chlorine water is stored in a transparent bottle in strong sunlight for several days. The solution finally contains mainly JEE Main level
Match the reaction of Cl2 in List I with the nitrogen- or chlorine-containing product in List II. List I: (P) cold dilute NaOH, (Q) hot concentrated NaOH, (R) e... JEE Main level
Assertion (A): Dry chlorine does not bleach dry coloured flowers, but moist chlorine does. Reason (R): In the presence of moisture chlorine forms hypochlorous a... JEE Main level
17.4 g of MnO2 (M=87 g mol^-1) is heated with excess concentrated HCl. Taking the molar volume at STP as 22.4 L mol^-1, the volume of Cl2 evolved at STP is JEE Main level
Chlorine water (aqueous chlorine) contains which of the following? JEE Main level
Which of the following reactions of chlorine are correctly stated? JEE Main level
A current of 5.0 A is passed for 1930 s through concentrated brine (chlor-alkali cell), with chlorine liberated at the anode at 100% current efficiency. Using F... JEE Advanced level
7.9 g of anhydrous Na2S2O3 (M=158 g mol^-1) is used as an antichlor and is oxidised completely to sulphate by chlorine (Cl- is the only chlorine product). Takin... JEE Advanced level
0.10 mol of KI in water is treated with just enough chlorine to convert all the iodide into KIO3 (chlorine is reduced to Cl-). The number of moles of Cl2 requir... JEE Advanced level
21.3 g of Cl2 is passed into hot concentrated NaOH so that all of it disproportionates to chloride and chlorate. Taking Na=23 and Cl=35.5, the mass of NaCl form... JEE Advanced level
Given E deg(Cl2/Cl-)=1.36 V and E deg(Fe^3+/Fe^2+)=0.77 V, and F=96500 C mol^-1, the standard Gibbs energy change for Cl2 + 2Fe^2+ -> 2Cl- + 2Fe^3+ (per mole of... JEE Advanced level
10.65 g of Cl2 reacts with excess ammonia according to 8NH3 + 3Cl2 -> 6NH4Cl + N2. Taking N=14, H=1 and Cl=35.5, the mass of NH4Cl formed is JEE Advanced level
73 g of HCl and 8 g of O2 are passed over hot CuCl2 catalyst (Deacon process, 4HCl + O2 -> 2Cl2 + 2H2O, complete conversion of the limiting reagent). Taking H=1... JEE Advanced level
Which of the following statements about the reactions of chlorine with sodium hydroxide are correct? JEE Advanced level
Which of the following statements about the reaction of chlorine with ammonia are correct? JEE Advanced level
Which of the following oxidations by chlorine (in aqueous solution) are correct? JEE Advanced level
A 0.500 g sample of bleaching powder is treated with excess dilute acid and excess KI. The iodine liberated needs 49.3 mL of 0.100 M Na2S2O3 (I2 + 2S2O3^2- -> 2... JEE Advanced level
Chlorine reacts with cold dilute sodium hydroxide to give NEET level
Chlorine reacts with dry slaked lime to form NEET level
Chlorine dissolves in water to give NEET level
0.60 mol of Cl2 reacts completely with hot concentrated NaOH according to 3Cl2 + 6NaOH -> 5NaCl + NaClO3 + 3H2O. The number of moles of electrons lost by the ch... JEE Advanced level
A 1.00 g sample of bleaching powder is treated with excess KI and dilute acid. The liberated iodine requires 98.4 mL of 0.100 M Na2S2O3. Take Cl = 35.5, so the ... JEE Advanced level
Chlorine is passed into (i) excess aqueous ammonia and (ii) ammonia in the presence of excess chlorine. The main nitrogen-containing products are, respectively, JEE Main level
Bleaching powder, Ca(OCl)Cl, is treated with excess dilute H2SO4 and Cl2 is liberated. The oxidation states of the two chlorine atoms in bleaching powder and th... JEE Main level
Which statement correctly contrasts the bleaching action of moist Cl2 and moist SO2? JEE Main level
Chlorine gas is passed into aqueous KI containing starch until the blue colour first appears and then disappears. The final iodine-containing product is iodate ... JEE Advanced level
Select the correct reaction(s) of chlorine. JEE Main level
Assertion (A): Chlorine water kept in sunlight gradually loses its colour and its bleaching power. Reason (R): HOCl formed in chlorine water decomposes in light... JEE Main level
21.3 g of Cl2 is passed through excess hot concentrated NaOH (3Cl2 + 6NaOH -> 5NaCl + NaClO3 + 3H2O). Molar masses (g mol^-1): Cl2 71, NaClO3 106.5, NaCl 58.5. ... JEE Advanced level
Chlorine oxidises thiosulphate to sulphate (Na2S2O3 + 4Cl2 + 5H2O -> 2NaHSO4 + 8HCl), whereas iodine oxidises it to tetrathionate (2S2O3^2- + I2 -> S4O6^2- + 2I... JEE Advanced level
In which of the following reactions does Cl2 undergo disproportionation? JEE Main level