All Free Chemistry MCQs with Answers
Every Chemistry question in the bank, across all chapters, each with the correct answer and a written explanation. Free and unlimited, with no account needed.
13,720 questions · page 494 of 686
- A. They conduct electricity in molten state
- B. They are used as reducing agents
- C. They give H2 from H2O
- D. They are covalent in nature
Explanation: Saline hydrides (also known as ionic hydrides or pseudohalides) are compounds form between hydrogen and the most active metals, especially…
Correct answer: They are covalent in nature- A. Alkaline earth metal
- B. Alkali Metal
- C. Outer transition metal
- D. Inner transition metal
- E. None of the above
Explanation: If X is a halogen this means X has an oxidation of -1. Since the compound formed when X reacts with halogen to form MX, the M has an…
Correct answer: Alkali Metal- A. Acidic
- B. Alkaline
- C. Both Acidic and Alkaline
- D. Neutral
- E. None of these
Explanation: Sodium carbonate (Na2CO3), commonly known as washing soda, dissociates in water to form sodium ions (Na+) and carbonate ions (CO32-).
Correct answer: Alkaline- A. H+>H>H-
- B. H>H->H+
- C. H->H>H+
- D. H>H+>H
Explanation: Cationic radius > Atomic radius > Anionic radius. The correct answer is C) H- > H > H+. The correct order of radii is H- > H > H+.
Correct answer: H->H>H+9865. The greater 1st ionization energy would be associated with which of the following configuration
- A. 1s2 2s2 2p6 3s1
- B. 1s2 2s2 2p3
- C. 1s2 2s2 2p5
- D. 1s2 2s2 2p6
Explanation: The correct answer is D) 1s^2 2s^2 2p^6. Neon (Ne) has the greatest 1st ionization energy among the given configurations as it requires…
Correct answer: 1s2 2s2 2p6- A. [Ne] 3s2 3p1
- B. [Ne] 3s2 3p2
- C. [Ne] 3s2 3p3
- D. [Ne] 3s2 3p4
Explanation: The element with the highest ionization energy is fluorine (F) with the electron configuration [Ne] 3s2 3p3.
Correct answer: [Ne] 3s2 3p3- A. Oxygen
- B. Bromine
- C. Fluorine
- D. Carbon
Explanation: Fluorine has the highest electronegativity value of 3.98, making it the correct answer.
Correct answer: Fluorine- A. Middle East
- B. south-western Asia and northern Africa
- C. from the Mediterranean to
- D. the Arabian peninsula.
Explanation: It should be "The Middle East".The corrected sentence is: The Middle East is an extensive area of southwestern Asia and northern Africa…
Correct answer: Middle East9869. Spot the error. I, you, and he have been nominated for the special award in the field of academics.
- A. I, you, and he
- B. for
- C. in
- D. academics
Explanation: This is wrong sequence it should be He, you and I instead of I you and He
Correct answer: I, you, and he- A. Complicated by
- B. Exhausted with
- C. Obscured by
- D. Saturated with
Explanation: The word "saturated" most accurately indicates the density of the oxygen in the room.
Correct answer: Saturated with- A. 'Yes.' he said 'and I always keep my promises.'
- B. 'Yes,' he said. 'And I always keep my promises.'
- C. 'Yes.' he said! 'and I always keep my promises.'
- D. Yes.' he said. 'And I always keep my promises.'
Explanation: The correct sentence is: Yes, he said. 'And I always keep my promises'.
Correct answer: 'Yes,' he said. 'And I always keep my promises.'- A. Definitely true
- B. Probably true
- C. Data inadequate
- D. Probably false
- E. Definitely false
Explanation: The correct answer is 'Definitely true'. The passage clearly states that the mangoes are of premium quality and highlights the…
Correct answer: Definitely true- A. 15
- B. 16
- C. 25
- D. 13
Explanation: This is the correct total count of rectangles and squares found by methodically analyzing each part of the figure.
Correct answer: 15- A. Statement I is the cause and statement II is its effect
- B. Statement II is the cause and statement I is its effect
- C. Both the statements I and II are independent causes
- D. Both the statements I and II are effects of independent causes
Explanation: Remarkable growth in the national economy (Statement II) is the cause. This growth leads to increased incomes and opportunities, which in…
Correct answer: Statement I is the cause and statement II is its effect- A. If only I is most appropriate
- B. If only II is most appropriate
- C. If either I or II is most appropriate
- D. If neither I nor II is most appropriate
Explanation: A complaint of corruption requires immediate and decisive action. Waiting for more complaints (Action II) could allow the corruption to…
Correct answer: If only I is most appropriate- A. NH4Cl
- B. NaCN
- C. CH,COONa
- D. K,SO,
Explanation: NH4Cl is a strong acidic salt because it form by strong acid HCl and ammonia
Correct answer: NH4Cl- A. Solid NaCl is covalent
- B. In the solid state, there are no ions
- C. In solid NaCl. there is no migration of ions
- D. In solid NaCl, there are not electron
Explanation: Conduction of electricity occurs when there is a free-moving charge (electrons or ions), so the answer is C.
Correct answer: In solid NaCl. there is no migration of ions- A. Magnetic
- B. Repulsive
- C. Electrostatic
- D. Weak
Explanation: An ionic crystal consists of ions bound together by electrostatic attraction.
Correct answer: Electrostatic- A. Ionization energy
- B. Ionic radius ratio
- C. Electron affinity
- D. Bond length
Explanation: NaCl and CsF have the same geometry because they have the same ionic radius ratio.
Correct answer: Ionic radius ratio- A. 4
- B. 6
- C. 8
- D. 3
Explanation: In NaCl (sodium chloride), each Na ion is surrounded by six chloride (Cl) ions, and each Cl ion is surrounded by six sodium (Na) ions.
Correct answer: 6