Practice

Question 101

Thermite is a mixture of:

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Correct answer: (B) Al powder and Fe₂O₃

1 marks · 2024 · Set E

Question 102

Which is not an ore of magnesium?

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Correct answer: (A) Gypsum

1 marks · 2024 · Set E

Question 103

Which metal(s) is/are commercially extracted by self-reduction from the corresponding ore?

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Correct answer: (D) More than one of the above

1 marks · 2024 · Set E

Question 104

Smelting iron in a blast furnace involves which processes?

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Correct answer: (D) More than one of the above

1 marks · 2024 · Set E

Question 105

Which is sparingly soluble in cold water and fairly soluble in hot water?

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Correct answer: (A) PbCl₂

1 marks · 2024 · Set E

Question 106

Among alkali-metal carbonates, which has the highest thermal stability?

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Correct answer: (A) Cs₂CO₃

1 marks · 2024 · Set E

Question 107

Potassium, when heated strongly in oxygen, forms:

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Correct answer: (B) KO₂

1 marks · 2024 · Set E

Question 108

Which is the most important factor in making lithium metal the strongest reducing agent?

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Correct answer: (B) Hydration enthalpy

1 marks · 2024 · Set E

Question 109

Which alkaline-earth metal hydroxide is least soluble in water?

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Correct answer: (A) Be(OH)₂

1 marks · 2024 · Set E

Question 110

A metal is burnt in air and the ash smells of NH₃ when moistened. The metal is:

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Correct answer: (B) Mg

1 marks · 2024 · Set E

Question 111

Examples of igneous and sedimentary rocks are:

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Correct answer: (D) More than one of the above

1 marks · 2024 · Set E

Question 112

Nitrogen dioxide cannot be obtained by heating:

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Correct answer: (D) More than one of the above

1 marks · 2024 · Set E

Question 113

Which method is used for purification of zirconium?

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Correct answer: (A) Van Arkel

1 marks · 2024 · Set E

Question 114

Which halogen disproportionates in water?

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Correct answer: (D) More than one of the above

1 marks · 2024 · Set E

Question 115

In which case is the order of acidic strength incorrect?

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Correct answer: (B) HIO₄ > HBrO₄ > HClO₄

1 marks · 2024 · Set E

Question 116

H₂O₂ has a greater dipole moment than H₂O but is not a good solvent because:

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Correct answer: (B) It dissociates easily and acts as an oxidising agent

1 marks · 2024 · Set E

Question 117

Which xenon compound has the same number of lone pairs as I₃⁻?

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Correct answer: (C) XeF₂

1 marks · 2024 · Set E

Question 118

Find the incorrect statement about borax.

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Correct answer: (B) One mole of borax contains 4 B–O–B bonds

1 marks · 2024 · Set E

Question 119

Which oxyacid contains both P–H and P–P bonds simultaneously?

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Correct answer: (E) None of the above

1 marks · 2024 · Set E

Question 120

For H₃PO₃ acid, calculate x + y + z, where x is the number of lone pairs, y the number of σ-bonds, and z the number of π-bonds.

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Correct answer: (B) 13

1 marks · 2024 · Set E

Question 121

Which property of halogens increases with increasing atomic number?

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Correct answer: (D) More than one of the above

1 marks · 2024 · Set E

Question 122

Which noble gas does not form clathrates?

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Correct answer: (B) Ne

1 marks · 2024 · Set E

Question 123

Which does not tend to act as a ligand during complex formation?

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Correct answer: (A) BiH₃

1 marks · 2024 · Set E

Question 124

Which acts as both an oxidising and a reducing agent?

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Correct answer: (D) More than one of the above

1 marks · 2024 · Set E

Question 125

Iodine is formed when potassium iodide reacts with:

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Correct answer: (D) More than one of the above

1 marks · 2024 · Set E

Question 126

Iron is rendered passive by treatment with:

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Correct answer: (A) Concentrated HNO₃

1 marks · 2024 · Set E

Question 127

The solubility of silver bromide in hypo solution is due to formation of:

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Correct answer: (C) [Ag(S₂O₃)₂]³⁻

1 marks · 2024 · Set E

Question 128

Mercury is the only metal liquid at 0°C. This is due to its:

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Correct answer: (A) Very high ionisation enthalpy and weak metallic bond

1 marks · 2024 · Set E

Question 129

Which metal nitrate produces a gaseous product when reacted with KCN solution?

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Correct answer: (A) Cu(NO₃)₂

1 marks · 2024 · Set E

Question 130

Which compound does not liberate oxygen gas on warming with concentrated H₂SO₄?

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Correct answer: (A) SO₃

1 marks · 2024 · Set E

Question 131

Cobalt salt + KNO₂ + CH₃COOH gives a yellow precipitate. The precipitate is:

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Correct answer: (A) Potassium cobaltinitrite

1 marks · 2024 · Set E

Question 132

Which salt will not give a positive brown-ring test?

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Correct answer: (A) Cu(NO₃)₂

1 marks · 2024 · Set E

Question 133

Which reaction is the Wurtz reaction?

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Correct answer: (B) 2CH₃Br + 2Na/ether → C₂H₆ + 2NaBr

1 marks · 2024 · Set E

Question 134

In which C–C bond of CH₃CH₂CH₂Br is the inductive effect expected to be least?

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Correct answer: (B) C₂–C₃

1 marks · 2024 · Set E

Question 135

Hyperconjugation is possible in:

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Correct answer: (D) More than one of the above

1 marks · 2024 · Set E

Question 136

Calculate the number of sigma and pi bonds in 2,8-dimethyl-3,6-decadiene.

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Correct answer: (A) 33 sigma and 2 pi bonds

1 marks · 2024 · Set E

Question 137

Which compound(s) show cis-trans isomerism?

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Correct answer: (D) More than one of the above

1 marks · 2024 · Set E

Question 138

Which group(s) is/are meta-directing?

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Correct answer: (D) More than one of the above

1 marks · 2024 · Set E

Question 139

Which are ambidentate nucleophiles?

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Correct answer: (D) More than one of the above

1 marks · 2024 · Set E

Question 140

Which is the most reactive species in an SN1 reaction?

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Correct answer: (A) (CH₃)₃CBr

1 marks · 2024 · Set E

Question 141

Although chlorine is an electron-withdrawing group, it is ortho-, para-directing. The reason is:

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Correct answer: (D) More than one of the above

1 marks · 2024 · Set E

Question 142

Which compound has the highest boiling point?

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Correct answer: (C) Propan-1-ol

1 marks · 2024 · Set E

Question 143

Which of the following is non-aromatic based on Hückel’s rule?

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Correct answer: (E) None of the above
By Hückel's rule a ring is aromatic if it holds (4n + 2) delocalised electrons. Naphthalene, anthracene and phenanthrene all meet that condition, so none of them is non-aromatic and the answer is ‘None of the above’.

1 marks · 2024 · Set E

Question 144

Which is the correct increasing order of acid strength?

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Correct answer: (A) Propan-1-ol < 4-methylphenol < phenol

1 marks · 2024 · Set E

Question 145

Aldehydes are easily oxidised to carboxylic acids by mild oxidising reagents such as:

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Correct answer: (D) More than one of the above

1 marks · 2024 · Set E

Question 146

Which statement is incorrect?

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Correct answer: (C) Amines are more polar than alcohols

1 marks · 2024 · Set E

Question 147

What is the correct order of basicity of aliphatic amines?

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Correct answer: (B) Secondary > tertiary > primary

1 marks · 2024 · Set E

Question 148

Which essential amino acid cannot be synthesised by our body?

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Correct answer: (D) More than one of the above

1 marks · 2024 · Set E

Question 149

Which vitamin(s) is/are fat-soluble?

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Correct answer: (D) More than one of the above

1 marks · 2024 · Set E

Question 150

Which polymer is biodegradable?

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Correct answer: (C) Nylon 2–nylon 6

1 marks · 2024 · Set E

TRE3 — Language General Studies And Chemistry