Match List I with List II. List I (Anion) List II (gas evolved on reaction with dil \(H_2SO_4\)) A. \(CO_3^{ 2−}\) I. Colourless gas which turns lead acetate paper black. B. \(S^{2–}\) II. Colourless gas which turns acidified potassium dichromate solution green C. \(SO_3^{ 2−}\) III. Brown fumes which turns acidified KI solution containing starch blue. D. \(NO_2^{−}\) IV. Colourless gas evolved with brisk effervescence, which turns lime water milky.
Choose the correct answer from the options given below:
| List I (Anion) | List II (gas evolved on reaction with dil \(H_2SO_4\)) | ||
|---|---|---|---|
| A. | \(CO_3^{ 2−}\) | I. | Colourless gas which turns lead acetate paper black. |
| B. | \(S^{2–}\) | II. | Colourless gas which turns acidified potassium dichromate solution green |
| C. | \(SO_3^{ 2−}\) | III. | Brown fumes which turns acidified KI solution containing starch blue. |
| D. | \(NO_2^{−}\) | IV. | Colourless gas evolved with brisk effervescence, which turns lime water milky. |
- A-III, B-I, C-II, D-IV
- A-II, B-I, C-IV, D-III
- A-IV, B-I, C-III, D-II
- A-IV, B-I, C-II, D-III
The Correct Option is D
Solution and Explanation
\(CO_3^{ 2−}\): On action of diluted sulphuric acid, \(CO_2\) gas is released which turns lime water milky.
\(S ^{2-}:\) On action of diluted sulphuric acid, \(H_2S\) gas is released which turns lead acetate paper black.
\(SO_3^{ 2−}\): On action of diluted \( H_2SO_4, SO_2\) gas is evolved which turns acidified potassium dichromate solution green.
\(NO^{2−}\): On action of dil \(H_2SO_4, NO_2\) gas is evolved which turns Kl solution contain starch blue.
\(Hence,\) the correct option is (D): \(A-IV, B-I, C-II, D-III\)
Top Questions on Gas laws
- Observe the following numbers:
I) 0.0063
II) 132.00
III) 1004
The number of significant figures in I, II and III respectively is - What volume will 2 moles of an ideal gas occupy at STP (Standard Temperature and Pressure)?
- 209 g of an element reacts with chlorine to form 315.5 g of its chloride. What is the weight of oxygen that reacts with 418 g of the same element? (Cl = 35.5, O = 16)
- Which one of the following gases is the major contributor to global warming?
- Which one of the following reactions is not feasible?
Questions Asked in JEE Main exam
The following diagram shows a Zener diode as a voltage regulator. The Zener diode is rated at \(V_z = 5\) V and the desired current in load is 5 mA. The unregulated voltage source can supply up to 25 V. Considering the Zener diode can withstand four times of the load current, the value of resistor \(R_s\) (shown in circuit) should be_______ \(\Omega\).
- JEE Main - 2026
- Current electricity
Two point charges 2q and q are placed at vertex A and centre of face CDEF of the cube as shown in figure. The electric flux passing through the cube is :
- JEE Main - 2026
- Rotational motion
- The speed of a longitudinal wave in a metallic bar is \(400\,\text{m/s}\). If the density and Young’s modulus of the bar material increase by \(0.5%\) and \(1%\) respectively, then the speed of the wave is changed approximately to _______ m/s.
- JEE Main - 2026
- General Physics
\[ \left( \frac{1}{{}^{15}C_0} + \frac{1}{{}^{15}C_1} \right) \left( \frac{1}{{}^{15}C_1} + \frac{1}{{}^{15}C_2} \right) \cdots \left( \frac{1}{{}^{15}C_{12}} + \frac{1}{{}^{15}C_{13}} \right) = \frac{\alpha^{13}}{{}^{14}C_0 \, {}^{14}C_1 \cdots {}^{14}C_{12}} \]
Then \[ 30\alpha = \underline{\hspace{1cm}} \]
- JEE Main - 2026
- Binomial theorem
- If the enthalpy of sublimation of Li is \(155\,\text{kJ mol}^{-1}\), enthalpy of dissociation of \( \mathrm{F_2} \) is \(150\,\text{kJ mol}^{-1}\), ionization enthalpy of Li is \(520\,\text{kJ mol}^{-1}\), electron gain enthalpy of F is \(-313\,\text{kJ mol}^{-1}\), and standard enthalpy of formation of LiF is \(-594\,\text{kJ mol}^{-1}\), then the magnitude of lattice enthalpy of LiF is ____________ kJ mol\(^{-1}\) (Nearest integer).
- JEE Main - 2026
- Thermochemistry
Concepts Used:
Gas Laws
The gas laws were developed at the end of the 18th century, when scientists began to realize that relationships between pressure, volume and temperature of a sample of gas could be obtained which would hold to approximation for all gases.
The five gas laws are:
- Boyle’s Law, which provides a relationship between the pressure and the volume of a gas.
- Charles’s Law, which provides a relationship between the volume occupied by a gas and the absolute temperature.
- Gay-Lussac’s Law, which provides a relationship between the pressure exerted by a gas on the walls of its container and the absolute temperature associated with the gas.
- Avogadro’s Law, which provides a relationship between the volume occupied by a gas and the amount of gaseous substance.
- The Combined Gas Law (or the Ideal Gas Law), which can be obtained by combining the four laws listed above.