#exam preparation

Applications of d and f Block Elements

Which of the following is NOT a use of transition metals or their compounds?

Transition metals and their compounds are used as catalysts, pigments, and in alloy formation. While platinum is used as an inert electrode in many electrochemical setups, the option 'inert electrodes' may be considered not primary/general for most transition metals.

Ref: NCERT Class 12 Chemistry > Chapter 4: d and f Block Elements > Topic: Applications of d and f Block Elements

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Applications of d and f Block Elements

Which of the following is NOT a use of lanthanoids?

Lanthanoids are not used as structural building materials due to their softness and high reactivity.

Ref: NCERT Class 12 Chemistry > Chapter 4: d and f Block Elements > Topic: Applications of d and f Block Elements

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Abnormal Molar Masses and van't Hoff Factor

What is the molality of a solution containing 10 g of glycerol (molar mass = 92 g/mol) in 200 g of water?

Moles of glycerol = (10/92) ≈ 0.1087 mol . Mass of solvent = 200 g = 0.2 kg. Molality = (0.1087/0.2) ≈ 0.5435 mol/kg .

Ref: NCERT Class 12 Chemistry > Chapter 1: Solutions > Topic: Abnormal Molar Masses and van't Hoff Factor

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Abnormal Molar Masses and van't Hoff Factor

A solution of NaCl (molar mass = 58.5 g/mol) in 500 g of water freezes at -1.116°C. If Kf = 1.86 K kg mol⁻¹ , what is th

Δ Tf = i · Kf · m . 1.116 = 2 × 1.86 × (moles/0.5) . 1.116 = 3.72 × (moles/0.5) , moles = (1.116 × 0.5/3.72) ≈ 0.15 . Mass = 0.15 × 58.5 = 8.775 g .

Ref: NCERT Class 12 Chemistry > Chapter 1: Solutions > Topic: Abnormal Molar Masses and van't Hoff Factor

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Directive Influence and Carcinogenicity and Uses

Question 112 from remaining tests (full text extracted from HTML source of test pages)

Explanation extracted from page source.

Ref: NCERT Class 11 Chemistry > Chapter 9: Hydrocarbons > Topic: Directive Influence and Carcinogenicity and Uses

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Directive Influence and Carcinogenicity and Uses

Question 105 from remaining tests (full text extracted from HTML source of test pages)

Explanation extracted from page source.

Ref: NCERT Class 11 Chemistry > Chapter 9: Hydrocarbons > Topic: Directive Influence and Carcinogenicity and Uses

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Directive Influence and Carcinogenicity and Uses

Question 98 from remaining tests (full text extracted from HTML source of test pages)

Explanation extracted from page source.

Ref: NCERT Class 11 Chemistry > Chapter 9: Hydrocarbons > Topic: Directive Influence and Carcinogenicity and Uses

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Directive Influence and Carcinogenicity and Uses

Question 91 from remaining tests (full text extracted from HTML source of test pages)

Explanation extracted from page source.

Ref: NCERT Class 11 Chemistry > Chapter 9: Hydrocarbons > Topic: Directive Influence and Carcinogenicity and Uses

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Directive Influence and Carcinogenicity and Uses

Question 84 from remaining tests (full text extracted from HTML source of test pages)

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Ref: NCERT Class 11 Chemistry > Chapter 9: Hydrocarbons > Topic: Directive Influence and Carcinogenicity and Uses

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Directive Influence and Carcinogenicity and Uses

Question 77 from remaining tests (full text extracted from HTML source of test pages)

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Ref: NCERT Class 11 Chemistry > Chapter 9: Hydrocarbons > Topic: Directive Influence and Carcinogenicity and Uses

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Aromatic Hydrocarbons - Electrophilic Substitution Reactions

Question 195 from remaining tests (full text extracted from HTML source of test pages)

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Ref: NCERT Class 11 Chemistry > Chapter 9: Hydrocarbons > Topic: Aromatic Hydrocarbons - Electrophilic Substitution Reactions

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Aromatic Hydrocarbons - Electrophilic Substitution Reactions

Question 188 from remaining tests (full text extracted from HTML source of test pages)

Explanation extracted from page source.

Ref: NCERT Class 11 Chemistry > Chapter 9: Hydrocarbons > Topic: Aromatic Hydrocarbons - Electrophilic Substitution Reactions

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