Tag: salts and their properties

Questions Related to salts and their properties

The commercial salt is purified by passing :

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

  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

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Correct Option: B
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.

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

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

  1. Both Statement 1 and Statement 2 are correct and Statement 2 is the correct explanation of Statement 1.

  2. Both Statement 1 and Statement 2 are correct and Statement 2 is not the correct explanation of Statement 1.

  3. Statement 1 is correct but Statement 2 is not correct.

  4. Statement 1 is not correct but Statement 2 is  correct.

  5. Both the Statement 1 and Statement 2 are not correct

Show answer
Correct Option: B
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.

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.

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

  1. Both Statement 1 and Statement 2 are correct and Statement 2 is the correct explanation of Statement 1.

  2. Both Statement 1 and Statement 2 are correct and Statement 2 is not the correct explanation of Statement 1.

  3. Statement 1 is correct but Statement 2 is not correct.

  4. Statement 1 is not correct but Statement 2 is correct.

  5. Both the Statement 1 and Statement 2 are not correct.

Show answer
Correct Option: A
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.

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

  1. Platinum, $Pt$

  2. Sodium chloride, $NaCl$

  3. Glucose, $C _{6}H _{12}O _{6}$

  4. Quartz, $SiO _{2}$

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Correct Option: B

Which of the following materials conducts electricity?

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

  1. Crystalline potassium chloride

  2. Fused sulphur

  3. Molten sodium chloride

  4. Diamond

Show answer
Correct Option: C
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.

Brine is:

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

  1. aqueous solution of chloride

  2. saturated solution of $NaCl$

  3. aqueous solution of $HCl$

  4. common name of bleaching powder

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Correct Option: B
Explanation:

Brine is a solution of salt ( usually sodium chloride ) in water.

Molten $NaCl$ conducts electricity due to the presence of:

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

  1. Free molecules

  2. Free ions

  3. Free electrons

  4. Free atoms

Show answer
Correct Option: B
Explanation:

Molten sodium chloride contains sodium ions and chloride ions which are free to move. 


Hence molten sodium chloride conducts electricity.

Option B is correct.

Crude common salt is hygroscopic because of impurities of:

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

  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 $Mg\left ( HCO _{3} \right ) _{2}$

Show answer
Correct Option: B
Explanation:

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

Hence option B is correct.

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

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

  1. free electrons

  2. free mobile ions

  3. immobile ions

  4. none of these

Show answer
Correct Option: B
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.