JEE Main 2023 · 10 Apr 2023 Shift 1

The number of molecules and moles in 2.8375 litres of O₂ at STP are respectively

1. A1.505 × 10²³ and 0.250 mol
2. B7.527 × 10²³ and 0.125 mol
3. C7.527 × 10²² and 0.125 mol
4. D7.527 × 10²² and 0.250 mol

Given

1. A2CO(g) + O₂(g) → 2CO₂(g) ΔH₁° = −x kJ mol⁻¹
2. BC (graphite) + O₂(g) → CO₂(g) ΔH₂° = −y kJ mol⁻¹ The ΔH° for the reaction C(graphite) + ½ O₂(g) → CO(g) is

The enthalpy change for the adsorption process and micelle formation respectively are

1. AΔHₐds < 0 and ΔHₘᵢc < 0
2. BΔHₐds > 0 and ΔHₘᵢc > 0
3. CΔHₐds > 0 and ΔHₘᵢc < 0
4. DΔHₐds < 0 and ΔHₘᵢc > 0

Which of the following is used as a stabilizer during the concentration of sulphide ores?

1. AXanthates
2. BPine oils
3. CCresols
4. DFatty acids

Lime reacts exothermally with water to give ‘A’ which has low solubility in water. Aqueous solution of ‘A’ is often used for the test of CO₂, a test in which insoluble B is formed. If B is further reacted with CO₂ then soluble compound is formed. ‘A’ is

1. AQuick lime
2. BLime water
3. CSlaked lime
4. DWhite lime

The compound which does not exist is

1. APbEt₄
2. B(NH₄)₂BeF₄
3. CNaO₂
4. DBeH₂

Which of the following statements are correct?

1. AThe M³⁺/M²⁺ reduction potential for iron is greater than manganese.
2. BThe higher oxidation states of first row d-block elements get stabilized by oxide ion.
3. CAqueous solution of Cr²⁺ can liberate hydrogen from dilute acid.
4. DMagnetic moment of V²⁺ is observed between 4.4 – 5.2 BM. Choose the correct answer from the options given below:

The octahedral diamagnetic low spin complex among the following is

1. A[CoF₆]³⁻
2. B[NiCl₄]²⁻
3. C[Co(NH₃)₆]³⁺
4. D[CoCl₆]³⁻