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The p-Block Elements

Multiple Choice Questions

501.

Aqueous solution of ferric chloride is acidic due to

ionization
polarization
dissociation
hydrolysis

502.

The correct order of heat of formation of halogen acids is

HI > HBr > HCl > HF
HF > HCl > HBr > HI
HCl > HF > HBr > HI
HCl > HBr > HF > HI

503.

The hydroxide insoluble in NH₄OH + NH₄Cl is

Al(OH)₃
Ca(OH)₃
Zn(OH)₂
Mg(OH)₂

504.

Precipitate of AgCl is soluble in liquid NH₃ the compound forms

Ag(NH₄)₂OH
Ag(NH₄)₂Cl
Ag(NH₃)₂OH
Ag(NH₃)₂Cl

505.

In qualitative analysis, in III group NH₄Cl is added before NH₄OH because

to increase the concentration of NH $_{4}^{+}$ ions
to increase the concentration of Cl^- ions
to reduce the concentration of OH^- ions
to increase the concentration of OH^- ions

506.

Which of the following is the weakest acid?

HCl
HF
H₂SO₄
HNO₃

507.
Which of the following contains greatest number of oxygen atoms ?

1 g of O

1 g of O₂

1 g of O₃

All have the same number of atoms

All have the same number of atoms

$Number of atoms = moles \times N_{A} \times atomicity Here, N_{A} = Avogadro' s number (a) Number of oxygen atoms in 1 g of O = \frac{1}{16} \times N_{A} \times 1 = \frac{N_{A}}{16} (b) Number of oxygen atoms in 1 g of O_{2} = \frac{1}{32} \times N_{A} \times 2 = \frac{N_{A}}{16} (c) Number of oxygen atoms in 1 g of O_{3} = \frac{1}{48} \times N_{A} \times 3 = \frac{N_{A}}{16} Hence, all have the same number of oxygen atoms .$