Inorganic Chemistry Study Resources for Competitive Exams

Inorganic Chemistry

Acids, Bases and Salts Acids, Bases and Salts - Advanced Concepts Acids, Bases and Salts - Applications Acids, Bases and Salts - Case Studies Acids, Bases and Salts - Competitive Exam Level Acids, Bases and Salts - Higher Difficulty Problems Acids, Bases and Salts - Numerical Applications Acids, Bases and Salts - Problem Set Acids, Bases and Salts - Real World Applications General Principles of Metallurgy General Principles of Metallurgy - Advanced Concepts General Principles of Metallurgy - Applications General Principles of Metallurgy - Case Studies General Principles of Metallurgy - Competitive Exam Level General Principles of Metallurgy - Higher Difficulty Problems General Principles of Metallurgy - Numerical Applications General Principles of Metallurgy - Problem Set General Principles of Metallurgy - Real World Applications Hydrogen and its Compounds Hydrogen and its Compounds - Advanced Concepts Hydrogen and its Compounds - Applications Hydrogen and its Compounds - Case Studies Hydrogen and its Compounds - Competitive Exam Level Hydrogen and its Compounds - Higher Difficulty Problems Hydrogen and its Compounds - Numerical Applications Hydrogen and its Compounds - Problem Set Hydrogen and its Compounds - Real World Applications Periodic Table and Periodicity Periodic Table and Periodicity - Advanced Concepts Periodic Table and Periodicity - Applications Periodic Table and Periodicity - Case Studies Periodic Table and Periodicity - Competitive Exam Level Periodic Table and Periodicity - Higher Difficulty Problems Periodic Table and Periodicity - Numerical Applications Periodic Table and Periodicity - Problem Set Periodic Table and Periodicity - Real World Applications Transition Elements and Coordination Chemistry Basics Transition Elements and Coordination Chemistry Basics - Advanced Concepts Transition Elements and Coordination Chemistry Basics - Applications Transition Elements and Coordination Chemistry Basics - Case Studies Transition Elements and Coordination Chemistry Basics - Competitive Exam Level Transition Elements and Coordination Chemistry Basics - Higher Difficulty Problems Transition Elements and Coordination Chemistry Basics - Numerical Applications Transition Elements and Coordination Chemistry Basics - Problem Set Transition Elements and Coordination Chemistry Basics - Real World Applications

Q. What is the coordination number of the complex [Cu(NH3)4]SO4?

A. 2
B. 4
C. 6
D. 8

Solution

In [Cu(NH3)4]SO4, copper is coordinated to four ammonia ligands, giving it a coordination number of 4.

Correct Answer: B — 4

Q. What is the coordination number of the metal ion in the complex [Co(NH3)6]Cl3?

A. 2
B. 4
C. 6
D. 8

Solution

The coordination number of the metal ion in [Co(NH3)6]Cl3 is 6, as it is surrounded by six ammonia ligands.

Correct Answer: C — 6

Q. What is the effect of hydrogen bonding on the boiling point of water?

A. Increases boiling point
B. Decreases boiling point
C. No effect
D. Varies with pressure

Solution

Hydrogen bonding significantly increases the boiling point of water compared to other similar-sized molecules.

Correct Answer: A — Increases boiling point

Q. What is the equivalent weight of sulfuric acid (H2SO4) for the purpose of neutralization?

A. 49 g
B. 98 g
C. 24.5 g
D. 196 g

Solution

Equivalent weight = molar mass / n, where n = number of H+ ions. Molar mass of H2SO4 = 98 g/mol, n = 2. Therefore, equivalent weight = 98 g / 2 = 49 g.

Correct Answer: C — 24.5 g

Q. What is the formula for the complex formed when iron(III) ions react with thiocyanate ions?

A. [Fe(SCN)3]
B. [Fe(SCN)2]
C. [Fe(SCN)6]3+
D. [Fe(SCN)4]2+

Solution

The complex formed is [Fe(SCN)3], where iron(III) ions coordinate with thiocyanate ions.

Correct Answer: A — [Fe(SCN)3]

Q. What is the formula for the compound formed between hydrogen and sulfur?

A. H2S
B. HS
C. H2SO4
D. H2SO3

Solution

The formula for the compound formed between hydrogen and sulfur is H2S (hydrogen sulfide).

Correct Answer: A — H2S

Q. What is the function of phosphoric acid in soft drinks?

A. Sweetener
B. Preservative
C. Flavor enhancer
D. Acidulant

Solution

Phosphoric acid serves as an acidulant, providing a tangy flavor and balancing sweetness in soft drinks.

Correct Answer: D — Acidulant

Q. What is the hybridization of the central metal ion in the complex [Ni(CO)4]?

A. sp
B. sp2
C. sp3
D. d2sp3

Solution

In [Ni(CO)4], nickel is in the +0 oxidation state and uses sp3 hybridization to form four equivalent bonds with the CO ligands.

Correct Answer: C — sp3

Q. What is the main advantage of using bioleaching in metallurgy?

A. Higher yield of metals
B. Lower energy consumption
C. Faster extraction rates
D. Less environmental impact

Solution

Bioleaching uses microorganisms to extract metals, resulting in less environmental impact compared to traditional methods.

Correct Answer: D — Less environmental impact

Q. What is the main component of the alloy brass?

A. Copper and tin
B. Copper and zinc
C. Iron and carbon
D. Aluminum and copper

Solution

Brass is primarily an alloy of copper and zinc.

Correct Answer: B — Copper and zinc

Q. What is the main environmental benefit of using hydrogen as a fuel?

A. It produces carbon dioxide
B. It is renewable
C. It produces only water as a byproduct
D. It is cheaper than fossil fuels

Solution

The main environmental benefit of using hydrogen as a fuel is that it produces only water as a byproduct when combusted.

Correct Answer: C — It produces only water as a byproduct

Q. What is the main product when hydrogen reacts with chlorine gas?

A. Hydrochloric acid
B. Hydrogen chloride
C. Chlorine gas
D. Chlorinated hydrocarbons

Solution

When hydrogen reacts with chlorine gas, it forms hydrochloric acid (HCl) in aqueous solution.

Correct Answer: B — Hydrogen chloride

Q. What is the main product when hydrogen reacts with halogens?

A. Hydrides
B. Acids
C. Salts
D. Oxides

Solution

When hydrogen reacts with halogens, the main product is hydrogen halides, which are acids.

Correct Answer: B — Acids

Q. What is the main purpose of calcination in metallurgy?

A. To remove moisture
B. To convert carbonates to oxides
C. To reduce metal ores
D. To purify metals

Solution

Calcination is primarily used to convert carbonates to oxides by heating them in the absence of air.

Correct Answer: B — To convert carbonates to oxides

Q. What is the main purpose of roasting in metallurgy?

A. To purify metals
B. To convert sulfides to oxides
C. To increase solubility
D. To reduce metal ores

Solution

Roasting is used to convert metal sulfides into oxides, making them easier to reduce.

Correct Answer: B — To convert sulfides to oxides

Q. What is the main purpose of using a flux in metallurgy?

A. To increase the melting point
B. To facilitate the reduction of ores
C. To remove impurities
D. To enhance the color of metals

Solution

Flux is used to remove impurities from ores during the smelting process, improving the quality of the extracted metal.

Correct Answer: C — To remove impurities

Q. What is the main reason for the low boiling point of hydrogen compared to other group 1 hydrides?

A. Hydrogen forms stronger bonds
B. Hydrogen has a lower molecular weight
C. Hydrogen does not form hydrogen bonds
D. Hydrogen is a gas at room temperature

Solution

Hydrogen does not form hydrogen bonds like heavier group 1 hydrides, leading to a lower boiling point.

Correct Answer: C — Hydrogen does not form hydrogen bonds

Q. What is the molarity of a sodium hydroxide solution if 0.4 moles are dissolved in 2 liters of water?

A. 0.2 M
B. 0.4 M
C. 0.5 M
D. 0.8 M

Solution

Molarity (M) = moles of solute / liters of solution. Here, M = 0.4 moles / 2 L = 0.2 M.

Correct Answer: B — 0.4 M

Q. What is the molecular formula of the compound formed when hydrogen reacts with chlorine?

A. HCl
B. H2Cl2
C. Cl2H2
D. H3Cl

Solution

The molecular formula of the compound formed when hydrogen reacts with chlorine is HCl (hydrochloric acid).

Correct Answer: A — HCl

Q. What is the net ionic equation for the reaction between H2SO4 and NaOH?

A. H+ + OH- -> H2O
B. Na+ + SO4^2- -> Na2SO4
C. H2SO4 + NaOH -> Na2SO4 + H2O
D. H2O -> H+ + OH-

Solution

The net ionic equation shows the formation of water from hydrogen ions and hydroxide ions.

Correct Answer: A — H+ + OH- -> H2O

Q. What is the oxidation state of chromium in potassium dichromate (K2Cr2O7)?

A. 0
B. +3
C. +6
D. +7

Solution

In potassium dichromate, chromium has an oxidation state of +6.

Correct Answer: C — +6

Q. What is the oxidation state of chromium in the complex ion [Cr(NH3)6]Cl3?

A. +2
B. +3
C. +4
D. +6

Solution

In the complex [Cr(NH3)6]Cl3, the ammonia ligands are neutral, so the oxidation state of chromium is +3.

Correct Answer: B — +3

Q. What is the oxidation state of chromium in the complex [Cr(NH3)6]Cl3?

A. +2
B. +3
C. +4
D. +6

Solution

In [Cr(NH3)6]Cl3, the ammonia ligands are neutral, so the oxidation state of chromium is +3.

Correct Answer: B — +3

Q. What is the oxidation state of hydrogen in NaH?

A. -1
B. 0
C. +1
D. +2

Solution

In sodium hydride (NaH), hydrogen has an oxidation state of -1 because it is bonded to a metal.

Correct Answer: A — -1

Q. What is the oxidation state of hydrogen in the hydride ion (H-)?

A. 0
B. +1
C. -1
D. +2

Solution

In the hydride ion (H-), hydrogen has an oxidation state of -1.

Correct Answer: C — -1

Q. What is the pH of a 0.001 M solution of sodium bicarbonate (NaHCO3)?

A. 8.4
B. 7.0
C. 9.0
D. 6.5

Solution

Sodium bicarbonate is a weak base. The pH can be estimated to be around 8.4 for a 0.001 M solution.

Correct Answer: A — 8.4

Q. What is the pH of a 0.01 M hydrochloric acid solution?

A. 1
B. 2
C. 3
D. 4

Solution

The pH of a strong acid like HCl can be calculated using the formula pH = -log[H+]. For 0.01 M HCl, pH = -log(0.01) = 2.

Correct Answer: A — 1

Q. What is the pH of a solution of hydrochloric acid (HCl) at a concentration of 0.1 M?

A. 1
B. 3
C. 7
D. 14

Solution

A 0.1 M solution of hydrochloric acid has a pH of approximately 1, indicating it is a strong acid.

Correct Answer: A — 1

Q. What is the pH of a solution that has a hydrogen ion concentration of 1 x 10^-7 M?

A. 7
B. 0
C. 14
D. 1

Solution

pH = -log[H+] = -log(1 x 10^-7) = 7.

Correct Answer: A — 7

Q. What is the pH range of a neutral solution at 25°C?

A. 0-7
B. 7-14
C. 7
D. 14

Solution

A neutral solution has a pH of 7 at 25°C, indicating equal concentrations of hydrogen and hydroxide ions.

Correct Answer: C — 7

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