Inorganic Chemistry

01

PYQ 2023

hard

chemistry ID: up-board

Write the chemical equation for the reactions of chlorine with (i) sulphur dioxide, and (ii) turpentine oil.

02

PYQ 2023

medium

chemistry ID: up-board

What happens when: Sodium Azide is heated? Lithium is heated with Nitrogen? Ammonium chromate is heated? Nitrogen is heated with oxygen? The aqueous solutions of Ammonium chloride and Sodium nitrite are allowed to react?

03

PYQ 2023

medium

chemistry ID: up-board

Write chemical equation for the preparation of ozone and its three oxidizing properties.

04

PYQ 2023

medium

chemistry ID: up-board

What is Aqua Regia? What happens when aqua regia reacts with (i) Gold, and (ii) Platinum.

05

PYQ 2023

medium

chemistry ID: up-board

Write the chemical equation for the reactions of chlorine with (i) sulphur dioxide, and (ii) turpentine oil.

06

PYQ 2023

medium

chemistry ID: up-board

Give any two dehydrating properties of H SO .

07

PYQ 2023

medium

chemistry ID: up-board

1 : 1 Molar mixture of FeSO and (NH) SO gives test of Fe ions, but 1 : 4 molar mixture of CuSO and NH (aq) does not give test of Cu ions. Why?}

Official Solution

Correct Option: (1)

$Step 1: Case of FeSO + (NH) SO . A 1:1 molar mixture of ferrous sulfate and ammonium sulfate forms Mohr’s salt . In this double salt, the ions are free and ionize completely in aqueous solution. Hence, Mohr’s salt gives the usual tests of ions. Step 2: Case of CuSO + NH (aq). When CuSO is treated with excess ammonia (1:4 ratio), a complex compound is formed. In this complex, copper ions are coordinated with ammonia molecules and are not free in solution. Hence, it does not give the normal tests of ions. Conclusion:$

08

PYQ 2023

medium

chemistry ID: up-board

$Noble gas which forms maximum number of compounds is:$

Official Solution

Correct Option: (1)

$Step 1: General reactivity of noble gases. Noble gases are generally inert due to their stable electronic configuration. However, heavier noble gases like xenon can form compounds because of their large atomic size and availability of vacant d-orbitals. Step 2: Known compounds. - Neon (Ne), Argon (Ar), and Helium (He) are almost completely inert and rarely form stable compounds. - Xenon (Xe) forms several stable compounds such as XeF, XeF, XeF, XeO, and XeO . Step 3: Conclusion. Thus, Xenon forms the maximum number of compounds among the noble gases. Final Answer:$

09

PYQ 2023

medium

chemistry ID: up-board

$Potassium sulphate is:$

1

$Ionic solid$

2

$Metallic solid$

3

$Covalent solid$

4

$Molecular solid$

Official Solution

Correct Option: (1)

$Step 1: Nature of potassium sulphate. Potassium sulphate (K SO) is composed of potassium cations (K) and sulphate anions (SO). These oppositely charged ions are held together by strong electrostatic forces of attraction. Step 2: Classify the solid. - Ionic solids consist of cations and anions arranged in a lattice structure. - Metallic solids consist of metal atoms with delocalized electrons. - Covalent solids consist of atoms held together by covalent bonds in a network structure. - Molecular solids consist of molecules held by weak van der Waals forces or hydrogen bonding. Step 3: Conclusion. Since K SO is made up of ions and held together by ionic bonds, it is classified as an ionic solid. Final Answer:$

10

PYQ 2024

easy

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$Discuss the method of preparation of potassium dichromate from chromite ore and write the structural formula of dichromate ion.$

Official Solution

Correct Option: (1)

11

PYQ 2024

medium

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$Discuss the method of preparation of potassium permanganate from pyrolusite and write the structural formula of permanganate ion.$

Official Solution

Correct Option: (1)

$Step 1: Potassium permanganate () is prepared from pyrolusite () via the following steps: Step 2: Oxidation of Pyrolusite: Step 3: Disproportionation of Manganate: Step 4: The structural formula of the permanganate ion ():$

12

PYQ 2024

medium

chemistry ID: up-board

$Explain Lanthanide contraction with reason.$

Official Solution

Correct Option: (1)

$Step 1: Definition: Lanthanide contraction refers to the gradual decrease in atomic and ionic radii of lanthanides across the series due to poor shielding by f-electrons. Step 2: Reason: - Poor shielding increases effective nuclear charge, pulling electrons inward.$

13

PYQ 2024

medium

chemistry ID: up-board

$Zn salts are white while Cu salts are blue in colour. Why?$

Official Solution

Correct Option: (1)

$Step 1: Electronic Configurations: - Zn = (fully filled, no d-d transitions) - Cu = (one unpaired electron, d-d transitions possible) Step 2: Reason for Colour: - Zn has no unpaired d-electrons â†’ No d-d transitions â†’ Appears white. - Cu has d-d transitions absorbing red-orange light, reflecting blue.$

14

PYQ 2024

medium

chemistry ID: up-board

$What is Tollen's reagent? Write the chemical equation of the reaction of aldehyde with Tollen's reagent.$

Official Solution

Correct Option: (1)

$Step 1: Definition: Tollen's reagent is an ammoniacal silver nitrate solution that oxidizes aldehydes to carboxylates, forming a silver mirror. Step 2: Reaction:$

15

PYQ 2025

medium

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$When a brown coloured salt (A) of Mn reacts with HCl, a gas (B) is obtained. This gas in excess reacts with NH to form an explosive salt (C). Identify (A), (B) and (C) and write the chemical equations.$

Official Solution

Correct Option: (1)

$Identification: (A) = (brown-black solid); (B) =; (C) = (explosive). Equations: Generation of chlorine from manganese dioxide and HCl: Action of (excess) on ammonia giving explosive nitrogen trichloride:$

16

PYQ 2025

medium

chemistry ID: up-board

$What happens when— (i) Chromite ore reacts with potassium carbonate in presence of air. (ii) Potassium dichromate reacts with ferrous sulphate in presence of sulphuric acid. (iii) Potassium permanganate is heated up to 513 K.$

Official Solution

Correct Option: (1)

$(i) Oxidative roasting of chromite with K CO (air): Chromite () is oxidised to potassium chromate; iron becomes . (ii) + in acidic medium: Dichromate oxidises to and is reduced to . In terms of salts: (iii) Heating to : Permanganate disproportionates giving manganate, manganese dioxide and oxygen.$

17

PYQ 2025

medium

chemistry ID: up-board

$Describe the method of preparation of potassium permanganate. How does acidic potassium permanganate react with the following? Give ionic equations: (i) H S (ii) Fe (iii) iodide ion.$

Official Solution

Correct Option: (1)

$Preparation of Potassium Permanganate (KMnO): Step 1 (Oxidative fusion): Natural MnO (pyrolusite) is fused with KOH in air / with an oxidiser (e.g., KNO) to form potassium manganate. Step 2 (Conversion to permanganate): The green manganate () is oxidised to the purple permanganate () by chlorine/ozone or by electrolysis. One convenient route is: (Alternatively, disproportionates in neutral/acidic medium: .) Reactions of acidic KMnO (strong oxidant; Mn(VII) Mn):} Overall reduction half‐equation in acid: . (i) With H S (to sulfur): (ii) With Fe (to Fe):} (iii) With iodide ion, I (to iodine):$

18

PYQ 2025

medium

chemistry ID: up-board

$A colourless ion in the following is$

1

$Cu$

2

$Cu$

3

$Ni$

4

$Fe$

Official Solution

Correct Option: (1)

$Step 1: Recall concept. Colour in transition metal ions arises due to - electronic transitions in partially filled orbitals. Step 2: Check ions. - Cu has configuration, fully filled -orbitals no - transitions, hence colourless. - Cu :, coloured. - Ni :, coloured. - Fe :, coloured. Step 3: Conclude. Only Cu is colourless. Final Answer: % Quciktip$

19

PYQ 2025

medium

chemistry ID: up-board

$Why metals show their maximum oxidation states in oxides and fluorides?$

Official Solution

Correct Option: (1)

$Metals tend to show their maximum oxidation states in oxides and fluorides due to the highly electronegative nature of oxygen and fluorine. Oxygen and fluorine have a strong tendency to accept electrons, which allows the metal to lose its electrons more readily. - In oxides (with oxygen as the ligand) and fluorides (with fluorine as the ligand), the metal tends to reach its highest oxidation state, as the electron withdrawing effect of oxygen and fluorine makes it easier for the metal to lose electrons. This is why, for example, metals like titanium, manganese, and chromium show their highest oxidation states in these compounds.$

20

PYQ 2025

medium

chemistry ID: up-board

$Write the color of following metal ions in aqueous solution:$

Official Solution

Correct Option: (1)

$(A) Zn : Zinc ions in aqueous solution are colorless because they do not have any d-electrons to cause absorption in the visible spectrum. (B) Cu : Copper((B) ions in aqueous solution are blue due to the d-d transitions of the configuration in Cu . (C) Cu : Copper((A) ions are colorless in aqueous solution because they have a fully filled configuration, which does not allow any electronic transitions in the visible range. Correct Answer: (A) Colorless (B) Blue (C) Colorless$

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Inorganic Chemistry

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Chapter Questions 20 MCQs

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Chapter Questions
20 MCQs