Tag: salts and their properties

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Multiple choice chemistry substances in common use salts and their properties study of some important salts salts used in daily life

The commercial salt is purified by passing :

  1. $H _2S$ gas through an alkaline solution ofsalt

  2. HCI gas through a saturated solution of salt
  3. $H _2$ gas through a solution of salt
  4. $CI _2$ gas through a saturated solution of salt
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The common table salt is prepared by passing HCI gas through a saturated solution of salt. The precipitation is due to common ion effect.

$\underset { Salt\,solution }{ NaCl }+H^++Cl^-\longrightarrow  \underset { ppt}{ NaCl } $

Hence, option B is correct.

Multiple choice chemistry substances in common use salts and their properties study of some important salts salts used in daily life

Statement 1: One mole of NaCl contains $2$ moles of ions.
Statement 2: NaCl is a stable salt at room temperature.

  1. <p>Both Statement 1 and Statement 2 are correct and Statement 2 is the correct explanation of Statement 1.</p>

  2. <p>Both Statement 1 and Statement 2 are correct and Statement 2 is not the correct explanation of Statement 1.</p>

  3. <p>Statement 1 is correct but Statement 2 is not correct.</p>

  4. <p>Statement 1 is not correct but Statement 2 is correct.</p>

  5. <p>Both the Statement 1 and Statement 2 are not correct</p>
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Option (B) is correct.

Statement 1:  One mole of $NaCl$ contains 2 moles of ions i.e. a mole of chloride and a mole of sodium.Every $NaCl$ molecules has a $Na$ and a $Cl^-$ atom. So, if you have $6.022x10^{23}$ molecules, you will have that same number of $Na$ atoms and $Cl^-$ atoms, and by definition, 1 mole is $6.022x10^{23} $atoms.

Statement 2: $NaCl$ is a stable salt at room temperature.Sodium and chlorine forms a strong ionic bond, completing the octet of both atoms.They are arranged in a face centered cubic crystal structure where each $Na^+$ or $Cl^-$ ion is surrounded by 6 of the opposite ions forming an octahedron. This makes sodium chloride a stable compound.

Multiple choice chemistry substances in common use salts and their properties study of some important salts salts used in daily life

Statement 1: Crystals of sodium chloride go into aqueous solution as ions.
Statement 2: The sodium ion has a $1+$ change and the chloride ion has a $1-$ charge and they are hydrated by the water molecules.

  1. <p>Both Statement 1 and Statement 2 are correct and Statement 2 is the correct explanation of Statement 1.</p>

  2. <p>Both Statement 1 and Statement 2 are correct and Statement 2 is not the correct explanation of Statement 1.</p>

  3. <p>Statement 1 is correct but Statement 2 is not correct.</p>

  4. <p>Statement 1 is not correct but Statement 2 is correct.</p>

  5. <p>Both the Statement 1 and Statement 2 are not correct. </p>
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Statement 1: Crystals of sodium chloride go into aqueous solution as ions.
$\displaystyle NaCl \rightleftharpoons Na^+ (aq) + Cl^- (aq) $
Statement 2: The sodium ion has a $1+$ change and the chloride ion has a $1−$ charge and they are hydrated by the water molecules.
Each sodium ion ( or each chloride ion) is surrounded by several water molecules.
Both Statement 1 and Statement 2 are correct and Statement 2 is the correct explanation of Statement 1.

Multiple choice chemistry substances in common use salts and their properties study of some important salts salts used in daily life

The type of bonding present in a substance can be determined from experimental data.
Based on the information in the table below, which of the following substances is most likely to represent the identity of the solid?

Melting Point Density Conductivity Alone Conductivity in Aqueous Solution
$801^{\circ}C$ $2.17\ g/cc$ None Excellent
  1. Platinum, $Pt$
  2. Sodium chloride, $NaCl$
  3. Glucose, $C _{6}H _{12}O _{6}$
  4. Quartz, $SiO _{2}$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The high melting point (801 C) and excellent conductivity in aqueous solution are characteristic of an ionic compound. Sodium chloride (NaCl) is a classic ionic solid that fits these properties perfectly.

Multiple choice chemistry substances in common use salts and their properties study of some important salts salts used in daily life

Which of the following materials conducts electricity?

  1. Crystalline potassium chloride

  2. Fused sulphur

  3. Molten sodium chloride

  4. Diamond
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In crystalline solids, the ions are tightly bound by strong coulombic force of attraction having greater interatomic interaction and less interparticle space. $ { Na }^{ + }$ and ${ Cl }^{ - } $ ions are free to move only in molten state or aqueous solution. Hence, they show electrical conductivity in molten state.

Multiple choice chemistry substances in common use salts and their properties study of some important salts salts used in daily life

Crude common salt is hygroscopic because of impurities of:

  1. $CaSO _{4}$ and $MgSO _{4}$
  2. $CaCl _{2}$ and $MgCl _{2}$
  3. $CaBr _{2}$ and $MgBr _{2}$
  4. $Ca\left ( HCO _{3} \right ) _{2}$ and $Mg\left ( HCO _{3} \right ) _{2}$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Crude common salt contains impurities such as $ CaSO _{ 4 },   CaCl _{ 2 } ,   MgCl _{ 2} $. Hence it is deliquescent (hygroscopic).

Hence option B is correct.

Multiple choice chemistry substances in common use salts and their properties study of some important salts salts used in daily life

Molten sodium chloride conducts electric current due to the presence of:

  1. free electrons

  2. free mobile ions

  3. immobile ions

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

Current is the rate of flow of charge. NaCl is an ionic solid. An ionic solid consists of a lattice of ${ Na }^{ + }$ and ${ Cl }^{ - }$ ions in which these ions are fixed in their places. Solid NaCl does not contain any mobile charge carriers that can facilitate the flow of charge. But molten NaCl contains free mobile ions ${ Na }^{ + }$ and ${ Cl }^{ - }$ ions which allow the passage of current.


Thus, molten NaCl conducts electric current due to the presence of free mobile ions.