321224
Assertion : Mohr salt is used as a primary standard in volumetric analysis. Reason : Mohr salt contains both \(\mathrm{Fe}^{2+}\) and \(\mathrm{Fe}^{3+}\) ions in the crystalline salt.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
Explanation:
Mohr salt \(\left(\mathrm{NH}_{4}\right)_{2} \mathrm{Fe}\left(\mathrm{SO}_{4}\right)_{2} \cdot 6 \mathrm{H}_{2} \mathrm{O}\) contains only \(\mathrm{Fe}^{2+}\) ions without any trace of \(\mathrm{Fe}^{3+}\) ions. Thus, a standard solution of \(\mathrm{Fe}^{2+}\) ions can be obtained directly by weighing a known amount of the Mohr salt. So option (3) is correct.
\(\mathrm{Fe}_{3} \mathrm{O}_{4}\) (lodestone or magnetic oxide of iron) is called magnetite. It is a mixed oxide and, thus known as ferrosoferric oxide.
CHXII08:THE D- & F-BLOCK ELEMENTS
321226
The number of water molecules in Mohr's salt is
1 2
2 4
3 6
4 8
Explanation:
Formula for Mohr's salt is \(\left[\left(\mathrm{NH}_{4}\right)_{2} \mathrm{Fe}\left(\mathrm{SO}_{4}\right)_{2} \cdot 6 \mathrm{H}_{2} \mathrm{O}\right]\).
AIIMS - 2013
CHXII08:THE D- & F-BLOCK ELEMENTS
321227
Which of the following is a highly corrosive salt?
1 \(\mathrm{FeCl}_{2}\)
2 \(\mathrm{PbCl}_{2}\)
3 \(\mathrm{Hg}_{2} \mathrm{Cl}_{2}\)
4 \(\mathrm{HgCl}_{2}\)
Explanation:
Mercuric chloride \(\left(\mathrm{HgCl}_{2}\right)\) is also known as corrosive sublimate as it is highly poisonous and corrosive. It is used ( \(9 \%\) solution) for sterlisation of surgical instruments, washing hands, preservative for wood. It is antidote for white of an egg. It is commercially prepared as follows \({\rm{HgS}}{{\rm{O}}_4} + 2{\rm{NaCl}} \to {\rm{HgC}}{{\rm{l}}_2} + {\rm{N}}{{\rm{a}}_2}{\rm{S}}{{\rm{O}}_4}\)
321224
Assertion : Mohr salt is used as a primary standard in volumetric analysis. Reason : Mohr salt contains both \(\mathrm{Fe}^{2+}\) and \(\mathrm{Fe}^{3+}\) ions in the crystalline salt.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
Explanation:
Mohr salt \(\left(\mathrm{NH}_{4}\right)_{2} \mathrm{Fe}\left(\mathrm{SO}_{4}\right)_{2} \cdot 6 \mathrm{H}_{2} \mathrm{O}\) contains only \(\mathrm{Fe}^{2+}\) ions without any trace of \(\mathrm{Fe}^{3+}\) ions. Thus, a standard solution of \(\mathrm{Fe}^{2+}\) ions can be obtained directly by weighing a known amount of the Mohr salt. So option (3) is correct.
\(\mathrm{Fe}_{3} \mathrm{O}_{4}\) (lodestone or magnetic oxide of iron) is called magnetite. It is a mixed oxide and, thus known as ferrosoferric oxide.
CHXII08:THE D- & F-BLOCK ELEMENTS
321226
The number of water molecules in Mohr's salt is
1 2
2 4
3 6
4 8
Explanation:
Formula for Mohr's salt is \(\left[\left(\mathrm{NH}_{4}\right)_{2} \mathrm{Fe}\left(\mathrm{SO}_{4}\right)_{2} \cdot 6 \mathrm{H}_{2} \mathrm{O}\right]\).
AIIMS - 2013
CHXII08:THE D- & F-BLOCK ELEMENTS
321227
Which of the following is a highly corrosive salt?
1 \(\mathrm{FeCl}_{2}\)
2 \(\mathrm{PbCl}_{2}\)
3 \(\mathrm{Hg}_{2} \mathrm{Cl}_{2}\)
4 \(\mathrm{HgCl}_{2}\)
Explanation:
Mercuric chloride \(\left(\mathrm{HgCl}_{2}\right)\) is also known as corrosive sublimate as it is highly poisonous and corrosive. It is used ( \(9 \%\) solution) for sterlisation of surgical instruments, washing hands, preservative for wood. It is antidote for white of an egg. It is commercially prepared as follows \({\rm{HgS}}{{\rm{O}}_4} + 2{\rm{NaCl}} \to {\rm{HgC}}{{\rm{l}}_2} + {\rm{N}}{{\rm{a}}_2}{\rm{S}}{{\rm{O}}_4}\)
321224
Assertion : Mohr salt is used as a primary standard in volumetric analysis. Reason : Mohr salt contains both \(\mathrm{Fe}^{2+}\) and \(\mathrm{Fe}^{3+}\) ions in the crystalline salt.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
Explanation:
Mohr salt \(\left(\mathrm{NH}_{4}\right)_{2} \mathrm{Fe}\left(\mathrm{SO}_{4}\right)_{2} \cdot 6 \mathrm{H}_{2} \mathrm{O}\) contains only \(\mathrm{Fe}^{2+}\) ions without any trace of \(\mathrm{Fe}^{3+}\) ions. Thus, a standard solution of \(\mathrm{Fe}^{2+}\) ions can be obtained directly by weighing a known amount of the Mohr salt. So option (3) is correct.
\(\mathrm{Fe}_{3} \mathrm{O}_{4}\) (lodestone or magnetic oxide of iron) is called magnetite. It is a mixed oxide and, thus known as ferrosoferric oxide.
CHXII08:THE D- & F-BLOCK ELEMENTS
321226
The number of water molecules in Mohr's salt is
1 2
2 4
3 6
4 8
Explanation:
Formula for Mohr's salt is \(\left[\left(\mathrm{NH}_{4}\right)_{2} \mathrm{Fe}\left(\mathrm{SO}_{4}\right)_{2} \cdot 6 \mathrm{H}_{2} \mathrm{O}\right]\).
AIIMS - 2013
CHXII08:THE D- & F-BLOCK ELEMENTS
321227
Which of the following is a highly corrosive salt?
1 \(\mathrm{FeCl}_{2}\)
2 \(\mathrm{PbCl}_{2}\)
3 \(\mathrm{Hg}_{2} \mathrm{Cl}_{2}\)
4 \(\mathrm{HgCl}_{2}\)
Explanation:
Mercuric chloride \(\left(\mathrm{HgCl}_{2}\right)\) is also known as corrosive sublimate as it is highly poisonous and corrosive. It is used ( \(9 \%\) solution) for sterlisation of surgical instruments, washing hands, preservative for wood. It is antidote for white of an egg. It is commercially prepared as follows \({\rm{HgS}}{{\rm{O}}_4} + 2{\rm{NaCl}} \to {\rm{HgC}}{{\rm{l}}_2} + {\rm{N}}{{\rm{a}}_2}{\rm{S}}{{\rm{O}}_4}\)
321224
Assertion : Mohr salt is used as a primary standard in volumetric analysis. Reason : Mohr salt contains both \(\mathrm{Fe}^{2+}\) and \(\mathrm{Fe}^{3+}\) ions in the crystalline salt.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
Explanation:
Mohr salt \(\left(\mathrm{NH}_{4}\right)_{2} \mathrm{Fe}\left(\mathrm{SO}_{4}\right)_{2} \cdot 6 \mathrm{H}_{2} \mathrm{O}\) contains only \(\mathrm{Fe}^{2+}\) ions without any trace of \(\mathrm{Fe}^{3+}\) ions. Thus, a standard solution of \(\mathrm{Fe}^{2+}\) ions can be obtained directly by weighing a known amount of the Mohr salt. So option (3) is correct.
\(\mathrm{Fe}_{3} \mathrm{O}_{4}\) (lodestone or magnetic oxide of iron) is called magnetite. It is a mixed oxide and, thus known as ferrosoferric oxide.
CHXII08:THE D- & F-BLOCK ELEMENTS
321226
The number of water molecules in Mohr's salt is
1 2
2 4
3 6
4 8
Explanation:
Formula for Mohr's salt is \(\left[\left(\mathrm{NH}_{4}\right)_{2} \mathrm{Fe}\left(\mathrm{SO}_{4}\right)_{2} \cdot 6 \mathrm{H}_{2} \mathrm{O}\right]\).
AIIMS - 2013
CHXII08:THE D- & F-BLOCK ELEMENTS
321227
Which of the following is a highly corrosive salt?
1 \(\mathrm{FeCl}_{2}\)
2 \(\mathrm{PbCl}_{2}\)
3 \(\mathrm{Hg}_{2} \mathrm{Cl}_{2}\)
4 \(\mathrm{HgCl}_{2}\)
Explanation:
Mercuric chloride \(\left(\mathrm{HgCl}_{2}\right)\) is also known as corrosive sublimate as it is highly poisonous and corrosive. It is used ( \(9 \%\) solution) for sterlisation of surgical instruments, washing hands, preservative for wood. It is antidote for white of an egg. It is commercially prepared as follows \({\rm{HgS}}{{\rm{O}}_4} + 2{\rm{NaCl}} \to {\rm{HgC}}{{\rm{l}}_2} + {\rm{N}}{{\rm{a}}_2}{\rm{S}}{{\rm{O}}_4}\)
