Tag: p- block elements-ii

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Multiple choice chemistry p- block elements-ii hydrogen chloride chlorine - 17 group p-block elements


 Appearance  Reaction with dilute $HCl$  Reaction with dilute $HNO _3$
 Unknown metal #1  Dull gray solid with white oxide coating Dissolved with bubbles of clear gas   Dissolved with bubbles of clear gas
 Unknown metal #2  Solid; lustrous, smooth silver-gray surface  No reaction  Dissolved with bubbles of orange gas

Identify the orange gas produced on the addition of dilute $HN{O} _{3}$ to unknown metal #2.

  1. ${Cl} _{2}$
  2. ${H} _{2}$
  3. ${O} _{2}$
  4. $C{O} _{2}$
  5. $N{O} _{2}$
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Silver has a lustrous smooth gray surface.

It reacts with $HNO _3$ as;
$3Ag+2{ HNO } _{ 3 }\rightarrow { 4AgNO } _{ 3 }+{ NO } _{ 2 }+{ H } _{ 2 }O$.
Thus the orange gas produced is $NO _2$.

Multiple choice chemistry p- block elements-ii hydrogen chloride chlorine - 17 group p-block elements
   Appearance   Reactions with dilute$HCl$ Reaction with Dilute$HNO _3$ 
 Unknown metal 1  Dull grey solid with white oxide coating  Dissolved with bubbles of clear gas  Dissolved with bubbles of clear gas
 Unknown metal 2  Solid, lustrous, smooth silver-grey surface  No reaction   Dissolved with bubbles of orange gas

Identify the gas(transparent) produced with the addition of dilute $HCl$ to unknown metal 1.

  1. ${Cl} _{2}$
  2. ${H} _{2}$
  3. ${O} _{2}$
  4. $C{O} _{2}$
  5. $N{O} _{2}$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Metals reacts with $HCl$ to liberate hydrogen gas.

Multiple choice chemistry p- block elements-ii hydrogen chloride chlorine - 17 group p-block elements

The concentrated $HCl$ acid strongly fumes in_________.

  1. air

  2. water

  3. both

  4. none of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Concentrated hydrochloric acid fumes in the air forming acidic mists. Both the mist and the solution have a corrosive effect on human tissue with the potential to damage respiratory organs, eyes, skin and intestines.

Multiple choice chemistry p- block elements-ii hydrogen chloride chlorine - 17 group p-block elements

The boiling point of the hydrochloric acid varies with its concentration.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Physical properties of $HCl$ acid such as boiling point and melting points, density and pH depend upon the concentration or molarity of $HCl$ in the aqueous solution. They range from those of water at very low conc. approaching 0% $HCl$ to values for fuming $HCl$ over 40% $HCl$.

Multiple choice chemistry p- block elements-ii anomalous properties of nitrogen nitrogen - 15 group group 15 elements

Which of the following statements is wrong?

  1. Single N-N bond is stronger than the single P-P bond.
  2. $PH _{3}$ can act as a ligand in the formation of coordination compound with transition elements.
  3. $NO _{2}$ is paramagnetic in nature.
  4. Covalency of nitrogen in $N _{2}O _{5}$ is four.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

N-N sigma bond (single bod)  is weaker than P-P sigma bond (single bond) due to the small bond length between the nitrogen atoms. The lone pair of electrons of both the atoms nitrogen  repel each other making the single bon between $N-N$  weaker than P-P sigma bond.In $P-P$  bond the repulsion between sigma bond and lone pair electrons is less as the size of phosphorous is large.

So statement A is wrong.

Hence option A is correct.

Multiple choice chemistry p- block elements-ii anomalous properties of nitrogen nitrogen - 15 group group 15 elements

Nitrogen forms stable $N _{2}$ molecule but phosphorus is converted to $P _{4}$ from $P _{2}$ because:

  1. p$\pi$-p$\pi$ bonding is strong in phosphorus
  2. p$\pi$-p$\pi$ bonding is weak in phosphorus

  3. triple bond is present in phosphorus
  4. single $P - P$ bond is weaker than $N -N$ bond
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

$P$ has empty $d$ orbital, that can be filled by an additional electron. And since its size is bigger it is least likely to handle triple bond, as size increases $\pi$ overlapping decreases. 

Multiple choice chemistry p- block elements-ii anomalous properties of nitrogen nitrogen - 15 group group 15 elements

Which of the following mlecular $P\pi -P\pi $ bond?

  1. ${ NO } _{ 3 }^{ - }$

  2. CO
  3. ${ CO } _{ 3 }^{ -2 }$
  4. ${ NO } _{ 4 }^{ -2 }$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

CO (carbon monoxide) has a π bond between carbon and oxygen where both atoms contribute p-orbitals - a pπ-pπ bond. Nitrate and carbonate ions have resonance, and nitrate ion does not contain a double bond structure.

Multiple choice chemistry p- block elements-ii anomalous properties of nitrogen nitrogen - 15 group group 15 elements

Which of the following  molecules is having $2p\pi -3d\pi $ bond?

  1. ${ SO } _{ 3 }$
  2. ${ NO } _{ 3 }^{ - }$
  3. ${ SO } _{ 2- }^{ 4 }$
  4. ${ PO } _{ 3- }^{ 4 }$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In sulfur trioxide (SO3), sulfur utilizes its empty d-orbitals to form pi bonds with the p-orbitals of oxygen atoms, resulting in p_pi-d_pi bonding. The other species listed either lack vacant d-orbitals of appropriate energy or do not form d-pi bonds in the same manner.