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Question

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Explanation:

The image contains a chemistry worksheet with multiple-choice questions. Due to the high number of questions (24 visible items) and the blurry quality, we will focus on solving the most legible and central questions clearly. Let's analyze a selection of the clearest questions visible in the center and right columns.

Analyze Question 27

The question asks: "What is the name of the compound \(Mg\text{Cl}_2\)?"

  • \(Mg\) is Magnesium, an alkaline earth metal.
  • \(\text{Cl}\) is Chlorine, which forms the chloride anion.
  • Since magnesium forms only one stable ion (\(Mg^{2+}\)), we do not use Roman numerals.
  • The name is Magnesium chloride.
  • This corresponds to option C.

Analyze Question 28

The question asks: "Which of the following is a covalent (molecular) compound?"

  • Covalent compounds are formed between non-metals sharing electrons.
  • Let's look at the options:
  • A) \(\text{Al}_2\text{O}_3\) (Ionic)
  • B) \(\text{MgO}\) (Ionic)
  • C) \(\text{H}_2\text{O}\) (Covalent)
  • D) \(\text{CaF}_2\) (Ionic)
  • \(\text{H}_2\text{O}\) consists of non-metals hydrogen and oxygen sharing electrons.
  • This corresponds to option C.

Analyze Question 31

The question asks: "What is the formula for aluminum chloride?"

  • Aluminum forms a \(Al^{3+}\) cation.
  • Chlorine forms a \(\text{Cl}^-\) anion.
  • To balance the charges, we need three chloride ions for every aluminum ion: \(\text{AlCl}_3\).
  • This corresponds to option B.

Analyze Question 33

The question asks: "What is the correct formula for calcium phosphate?"

  • Calcium forms a \(\text{Ca}^{2+}\) cation.
  • Phosphate is a polyatomic anion with the formula \(\text{PO}_4^{3-}\).
  • To balance the charges, we find the least common multiple of 2 and 3, which is 6.
  • We need three \(\text{Ca}^{2+}\) ions (\(3 \times +2 = +6\)) and two \(\text{PO}_4^{3-}\) ions (\(2 \times -3 = -6\)).
  • The formula is \(\text{Ca}_3(\text{PO}_4)_2\).
  • This corresponds to option B.

Analyze Question 35

The question asks: "What is the name of \(\text{N}_2\text{O}\)?"

  • This is a covalent compound consisting of nitrogen and oxygen.
  • We use prefixes to indicate the number of atoms: "di-" for two nitrogens and "mono-" (often simplified) for one oxygen.
  • The systematic name is Dinitrogen monoxide (commonly called dinitrogen oxide).
  • This corresponds to option B.

Analyze Question 42

The question asks: "Which of the following is a base?"

  • Bases typically produce hydroxide ions (\(\text{OH}^-\)) in aqueous solution.
  • Let's look at the options:
  • A) \(\text{H}_2\text{SO}_4\) (Acid)
  • B) \(\text{HCl}\) (Acid)
  • C) \(\text{NaOH}\) (Base)
  • D) \(\text{HNO}_3\) (Acid)
  • \(\text{NaOH}\) (Sodium hydroxide) is a strong base.
  • This corresponds to option C.

Analyze Question 44

The question asks: "What color does litmus paper turn in the presence of an acid?"

  • Acids turn blue litmus paper red.
  • This corresponds to option D.

Analyze Question 46

The question asks: "Which of the following has the highest pH?"

  • pH values range from 0 to 14, where higher values are more basic.
  • Let's look at the options:
  • A) Lemon juice (pH 2)…

Answer:

Question 27

  • (A) Manganese dichloride
  • (B) Magnesium dichloride
  • (C) Magnesium chloride (Correct answer)
  • (D) Manganese(II) chloride

Question 28

  • (A) Al2O3
  • (B) MgO
  • (C) H2O (Correct answer)
  • (D) CaF2

Question 31

  • (A) AlCl
  • (B) AlCl3 (Correct answer)
  • (C) Al3Cl
  • (D) Al2Cl3

Question 33

  • (A) CaPO4
  • (B) Ca3(PO4)2 (Correct answer)
  • (C) Ca2(PO4)3
  • (D) Ca3PO4

Question 35

  • (A) Nitrogen oxide
  • (B) Dinitrogen oxide (Correct answer)
  • (C) Nitrogen (II) oxide
  • (D) Mononitrogen oxide

Question 42

  • (A) H2SO4
  • (B) HCl
  • (C) NaOH (Correct answer)
  • (D) HNO3

Question 44

  • (A) Blue
  • (B) Green
  • (C) Yellow
  • (D) Red (Correct answer)

Question 46

  • (A) Lemon juice (pH 2)
  • (B) Black coffee (pH 5)
  • (C) Sea water (pH 8)
  • (D) Liquid drain cleaner (pH 14) (Correct answer)

Question 48

  • (A) A gas is always produced
  • (B) Salt and water are produced (Correct answer)
  • (C) Only water is produced
  • (D) A precipitate always forms