Use the figure below to answer the question that follows.
Which molecule or molecules has/have the same empirical formula as one of the others?

II only.

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III and IV

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IV only

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I and III, and III and IV

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Solution

The correct option is B III and IV
Empirical formula is the simplest ratio of atoms in the compound.
$I = N H_{3} \Rightarrow N : H = 1 : 3$
$I I = N_{2} H_{4} \Rightarrow N : H = 1 : 2$
$I I I = N O_{2} \Rightarrow N : O = 1 : 2$
$I V = N_{2} O_{4} \Rightarrow N : O = 1 : 2$
So, III & IV has same empirical formula.

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Which of the following is/are true when HCl(g) is passed through water?
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Q. Question 27.
Which of the following is/are true when HCl(g) is passed through water?
(i) It does not ionise in the solution as it is a covalent compound.
(ii) It ionises in the solution.
(iii) It gives both hydrogen and hydroxyl ion in the solution.
(iv) It forms hydronium ion in the solution due to the combination of hydrogen ion with water molecule.

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(b) (iii) only
(c) (ii) and (iv)
(d) (iii) and (iv)

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Use the figure below to answer the question that follows.Which molecule or molecules has/have the same empirical formula as one of the others?

The correct option is B III and IVEmpirical formula is the simplest ratio of atoms in the compound.I=NH3⇒N:H=1:3II=N2H4⇒N:H=1:2III=NO2⇒N:O=1:2IV=N2O4⇒N:O=1:2So, III & IV has same empirical formula.

Use the figure below to answer the question that follows.
Which molecule or molecules has/have the same empirical formula as one of the others?