WBCS Mains Chemistry Inorganic Chemistry & Acid-Base Questions 2023

Q. Which one of the following is not a metalloid?
(A) Boron
(B) Silicon
(C) Gallium
(D) Germanium

Correct Answer: (C) Gallium

Q. The usual pH of sea water ranges from
(A) 7.5 – 8.5
(B) 8.5 – 9.5
(C) 9.5 – 10.5
(D) 10.5 – 11.5

Correct Answer: (A) 7.5 – 8.5

Q. The colour of CuS is
(A) Black
(B) Blue
(C) Yellow
(D) Red

Correct Answer: (A) Black

Q. Reaction of Lead Oxide (PbO) and hydrogen gas (H₂) leads to
(A) Reduction of lead
(B) Oxidation of lead
(C) Formation of PbCl₂
(D) Formation of PbO

Correct Answer: (A) Reduction of lead

WBCS Mains Chemistry Inorganic Chemistry & Acid-Base Questions 2022

Q. Which of the following is known as inorganic graphite?
(A) (BN)₃
(B) B₃N₃H₆
(C) Si₆
(D) Si₃N₄

Correct Answer: (A) (BN)₃

Q. Which of the following is a double salt?
(A) FeSO₄·6H₂O
(B) Pb(OH)NO₃
(C) K₂SO₄·Al₂(SO₄)₃·24H₂O
(D) K₄[Fe(CN)₆]

Correct Answer: (C) K₂SO₄·Al₂(SO₄)₃·24H₂O

WBCS Mains Chemistry Inorganic Chemistry & Acid-Base Questions 2021

Q. An aqueous solution of iron(III) chloride is
(A) Acidic
(B) Alkaline
(C) Neutral
(D) Amphoteric

Correct Answer: (A) Acidic

Q. Of the following elements, which one has the highest electronegativity?
(A) I
(B) Br
(C) Cl
(D) F

Correct Answer: (D) F

Q. Which of the following compounds is expected to be coloured?
(A) Ag₂SO₄
(B) CuF₂
(C) MgF₂
(D) CuCl

Correct Answer: (B) CuF₂

WBCS Mains Chemistry Inorganic Chemistry & Acid-Base Questions 2020

Q. The pH value of a neutral solution is
(A) 3
(B) 5
(C) 7
(D) 9

Correct Answer: (C) 7

Q. Which of the following statements is not a correct statement about the trends when going from left to right across the periods of Periodic Table?
(A) The elements become less metallic in nature.
(B) The number of valence electrons increases.
(C) The atoms lose their electrons more easily.
(D) The oxides become more acidic.

Correct Answer: (C) The atoms lose their electrons more easily.

Q. What happens when dilute hydrochloric acid is added to iron fillings?
(A) Hydrogen gas and iron chloride are produced.
(B) Chlorine gas and iron hydroxide are produced.
(C) No reaction takes place.
(D) Iron salt and water are produced.

Correct Answer: (A) Hydrogen gas and iron chloride are produced.

Q. The metal which can be easily cut with a knife is
(A) Paper
(B) Silver
(C) Sodium
(D) Gold

Correct Answer: (C) Sodium

Q. Fe₂O₃ + 2Al → Al₂O₃ + 2Fe. This reaction is an example of a
(A) Combination reaction
(B) Double displacement reaction
(C) Decomposition reaction
(D) Displacement reaction

Correct Answer: (D) Displacement reaction

Q. Write the chemical formula of Magnesium chloride.
(A) MgCl
(B) MgCl₂
(C) MgCl₃
(D) MgCl₄

Correct Answer: (B) MgCl₂

Q. The first periodic table was given by
(A) Mendel
(B) Mendeleev
(C) Bohr
(D) Dalton

Correct Answer: (B) Mendeleev

Q. Sea water is
(A) Acidic
(B) Alkaline
(C) Neutral
(D) Hypotonic

Correct Answer: (B) Alkaline

WBCS Mains Chemistry Inorganic Chemistry & Acid-Base Questions 2019

Q. SiO₂ is reacted with Sodium Carbonate. What is the gas liberated?
(A) CO₂
(B) CO
(C) O₂
(D) O₃

Correct Answer: (A) CO₂

Q. Oxidation state of Oxygen in F₂O is
(A) -1
(B) +1
(C) +2
(D) -2

Correct Answer: (B) +1

WBCS Mains Chemistry Inorganic Chemistry & Acid-Base Questions 2018

Q. Which of the following salt is dissolved in aqueous ammonia?
(A) PbCl₂
(B) Cu(OH)₂
(C) AgI
(D) Al(OH)₃

Correct Answer: (B) Cu(OH)₂

Q. The reaction of Cl₂ + 2NaOH = NaCl + NaOCl + H₂O is a
(A) Substitution reaction
(B) Elimination
(C) Neutralisation reaction
(D) Disproportionation reaction

Correct Answer: (D) Disproportionation reaction

Q. NH₃ gas is dried by using
(A) Conc. H₂SO₄
(B) P₂O₅
(C) Fused CaCl₂
(D) Quick Lime

Correct Answer: (D) Quick Lime

Q. In the contact process for the manufacture of H₂SO₄, V₂O₅ functions as
(A) Oxidising agent
(B) Reducing agent
(C) Catalyst
(D) Neutralising agent

Correct Answer: (C) Catalyst

Q. Which of the following is a complex salt?
(A) Al(NO₃)₃·9H₂O
(B) K₄[Fe(CN)₆]
(C) K₂SO₄·Cr(SO₄)₃·24H₂O
(D) Ca(OCl)Cl

Correct Answer: (B) K₄[Fe(CN)₆]

Q. When molten sulphur is poured suddenly into water, it takes the form of
(A) Milk of sulphur
(B) Flower of sulphur
(C) Plastic sulphur
(D) Colloidal sulphur

Correct Answer: (C) Plastic sulphur

WBCS Mains Chemistry Inorganic Chemistry & Acid-Base Questions 2017

Q. The acid employed for etching of glass is
(A) HCl
(B) HNO₃
(C) Aqua-regia
(D) HF

Correct Answer: (D) HF

Q. Which one of the following remains in solid state at room temperature?
(A) Cl₂
(B) F₂
(C) I₂
(D) Br₂

Correct Answer: (C) I₂

Q. The most common element in the universe is
(A) Fe
(B) Ca
(C) Al
(D) Si

Correct Answer: (A) H

Q. Which one of the following is not peroxide?
(A) BaO₂
(B) Na₂O₂
(C) H₂O₂
(D) MnO₂

Correct Answer: (D) MnO₂

Q. Which one of these is not a transition metal?
(A) Ti
(B) Cr
(C) Ni
(D) Zn

Correct Answer: (D) Zn

Q. Which of the following behaves as the chemically most active non-metal?
(A) F₂
(B) He
(C) N₂
(D) O₂

Correct Answer: (A) F₂

WBCS Mains Chemistry Inorganic Chemistry & Acid-Base Questions 2015

Q. Which one of the following is also called a stranger gas?
(A) Argon
(B) Neon
(C) Xenon
(D) Nitrous Oxide

Correct Answer: (C) Xenon

WBCS Mains Chemistry Inorganic Chemistry & Acid-Base Questions 2014

Q. The following substance is not an oxidizing agent
(A) Ozone
(B) Chloride
(C) Potassium
(D) Fluorine

Correct Answer: (C) Potassium

Q. The most electronegative among the elements sodium, potassium, oxygen and fluorine is
(A) Sodium
(B) Potassium
(C) Oxygen
(D) Fluorine

Correct Answer: (D) Fluorine