JEE Main 2022 (Online) 29th June Morning Shift | JEE Main Year Wise Previous Years Questions

JEE Main 2022 (Online) 29th June Morning Shift

MCQ (Single Correct Answer)

-1

Out of Syllabus

Which of the following is a correct statement?

Brownian motion destabilises sols.

Any amount of dispersed phase can added to emulsion without destablising it.

Mixing two oppositely charged sols in equal amount neutralises charges and stabilises colloids.

Presence of equal and similar charges on colloidal particles provides stability to the colloidal solution.

JEE Main 2022 (Online) 29th June Morning Shift

MCQ (Single Correct Answer)

-1

The electronic configuration of Pt (atomic number 78) is :

[Xe] 4f¹⁴ 5d⁹ 6s¹

[Kr] 4f¹⁴ 5d¹⁰

[Xe] 4f¹⁴ 5d¹⁰

[Xe] 4f¹⁴ 5d⁸ 6s²

JEE Main 2022 (Online) 29th June Morning Shift

MCQ (Single Correct Answer)

-1

Out of Syllabus

In isolation of which one of the following metals from their ores, the use of cyanide salt is not commonly involved?

Zinc

Gold

Silver

Copper

JEE Main 2022 (Online) 29th June Morning Shift

MCQ (Single Correct Answer)

-1

Out of Syllabus

Which one of the following reactions indicates the reducing ability of hydrogen peroxide in basic medium?

HOCl + H₂O₂ $$\to$$ H₃O⁺ + Cl^$$-$$ + O₂

PbS + 4H₂O₂ $$\to$$ PbSO₄ + 4H₂O

2MnO$$_4^ - $$ + 3H₂O₂ $$\to$$ 2MnO₂ + 3O₂ + 2H₂O + 2OH^$$-$$

Mn²⁺ + H₂O₂ $$\to$$ Mn⁴⁺ + 2OH^$$-$$

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