321228
Assertion : \(\mathrm{AgBr}\) is used in photography. Reason : \(\mathrm{AgBr}\) undergoes photochemical reaction.
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:
\(\mathrm{AgBr}\) is the most sensitive silver halide to photoreduction. Hence, it is used as the light sensitive material in photographic films. The unchanged \(\mathrm{AgBr}\) is dissolved in hypo solution to cast an image on photographic plate. \(2 \mathrm{AgBr} \xrightarrow{\text { hu }} 2 \mathrm{Ag}+\mathrm{Br}_{2}\). So option (1) is correct.
CHXII08:THE D- & F-BLOCK ELEMENTS
321229
Which is least soluble in water ?
1 \(\mathrm{\mathrm{AgCl}}\)
2 \(\mathrm{\mathrm{AgBr}}\)
3 \(\mathrm{\mathrm{AgI}}\)
4 \({\rm{A}}{{\rm{g}}_{\rm{2}}}{\rm{S}}\)
Explanation:
The solubility order is : \({\rm{AgF}} > {\rm{AgCl}} > {\rm{AgBr}} > {\rm{AgI}} > {\rm{A}}{{\rm{g}}_{\rm{2}}}{\rm{S}}\)
CHXII08:THE D- & F-BLOCK ELEMENTS
321230
When \(\mathrm{Zn}\) is treated with excess of \(\mathrm{NaOH}\), the product obtained is
1 \(\mathrm{Zn}(\mathrm{OH})_{2}\)
2 \(\mathrm{ZnOH}\)
3 \(\mathrm{Na}_{2} \mathrm{ZnO}_{2}\)
4 None of these
Explanation:
On treating zinc with excess of \(\mathrm{NaOH}\), sodium zincate is obtained as major product. \[\begin{array}{*{20}{l}} {{\rm{Zn}} + 2{\rm{NaOH}} \to \mathop {{\rm{N}}{{\rm{a}}_2}{\rm{Zn}}{{\rm{O}}_2} + {{\rm{H}}_2}}\limits_{{\mkern 1mu} {\rm{Sodium}}\,\,{\rm{zincate}}} }\\ {} \end{array}\]
CHXII08:THE D- & F-BLOCK ELEMENTS
321231
Which of the following is a constituent of lithopone?
1 \(\mathrm{ZnSO}_{4}\)
2 \(\mathrm{ZnS}\)
3 \(\mathrm{ZnCl}_{2}\)
4 \(\mathrm{ZnO}\)
Explanation:
Lithopone is \(\mathrm{BaSO}_{4} \cdot \mathrm{ZnS}\)
321228
Assertion : \(\mathrm{AgBr}\) is used in photography. Reason : \(\mathrm{AgBr}\) undergoes photochemical reaction.
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:
\(\mathrm{AgBr}\) is the most sensitive silver halide to photoreduction. Hence, it is used as the light sensitive material in photographic films. The unchanged \(\mathrm{AgBr}\) is dissolved in hypo solution to cast an image on photographic plate. \(2 \mathrm{AgBr} \xrightarrow{\text { hu }} 2 \mathrm{Ag}+\mathrm{Br}_{2}\). So option (1) is correct.
CHXII08:THE D- & F-BLOCK ELEMENTS
321229
Which is least soluble in water ?
1 \(\mathrm{\mathrm{AgCl}}\)
2 \(\mathrm{\mathrm{AgBr}}\)
3 \(\mathrm{\mathrm{AgI}}\)
4 \({\rm{A}}{{\rm{g}}_{\rm{2}}}{\rm{S}}\)
Explanation:
The solubility order is : \({\rm{AgF}} > {\rm{AgCl}} > {\rm{AgBr}} > {\rm{AgI}} > {\rm{A}}{{\rm{g}}_{\rm{2}}}{\rm{S}}\)
CHXII08:THE D- & F-BLOCK ELEMENTS
321230
When \(\mathrm{Zn}\) is treated with excess of \(\mathrm{NaOH}\), the product obtained is
1 \(\mathrm{Zn}(\mathrm{OH})_{2}\)
2 \(\mathrm{ZnOH}\)
3 \(\mathrm{Na}_{2} \mathrm{ZnO}_{2}\)
4 None of these
Explanation:
On treating zinc with excess of \(\mathrm{NaOH}\), sodium zincate is obtained as major product. \[\begin{array}{*{20}{l}} {{\rm{Zn}} + 2{\rm{NaOH}} \to \mathop {{\rm{N}}{{\rm{a}}_2}{\rm{Zn}}{{\rm{O}}_2} + {{\rm{H}}_2}}\limits_{{\mkern 1mu} {\rm{Sodium}}\,\,{\rm{zincate}}} }\\ {} \end{array}\]
CHXII08:THE D- & F-BLOCK ELEMENTS
321231
Which of the following is a constituent of lithopone?
1 \(\mathrm{ZnSO}_{4}\)
2 \(\mathrm{ZnS}\)
3 \(\mathrm{ZnCl}_{2}\)
4 \(\mathrm{ZnO}\)
Explanation:
Lithopone is \(\mathrm{BaSO}_{4} \cdot \mathrm{ZnS}\)
321228
Assertion : \(\mathrm{AgBr}\) is used in photography. Reason : \(\mathrm{AgBr}\) undergoes photochemical reaction.
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:
\(\mathrm{AgBr}\) is the most sensitive silver halide to photoreduction. Hence, it is used as the light sensitive material in photographic films. The unchanged \(\mathrm{AgBr}\) is dissolved in hypo solution to cast an image on photographic plate. \(2 \mathrm{AgBr} \xrightarrow{\text { hu }} 2 \mathrm{Ag}+\mathrm{Br}_{2}\). So option (1) is correct.
CHXII08:THE D- & F-BLOCK ELEMENTS
321229
Which is least soluble in water ?
1 \(\mathrm{\mathrm{AgCl}}\)
2 \(\mathrm{\mathrm{AgBr}}\)
3 \(\mathrm{\mathrm{AgI}}\)
4 \({\rm{A}}{{\rm{g}}_{\rm{2}}}{\rm{S}}\)
Explanation:
The solubility order is : \({\rm{AgF}} > {\rm{AgCl}} > {\rm{AgBr}} > {\rm{AgI}} > {\rm{A}}{{\rm{g}}_{\rm{2}}}{\rm{S}}\)
CHXII08:THE D- & F-BLOCK ELEMENTS
321230
When \(\mathrm{Zn}\) is treated with excess of \(\mathrm{NaOH}\), the product obtained is
1 \(\mathrm{Zn}(\mathrm{OH})_{2}\)
2 \(\mathrm{ZnOH}\)
3 \(\mathrm{Na}_{2} \mathrm{ZnO}_{2}\)
4 None of these
Explanation:
On treating zinc with excess of \(\mathrm{NaOH}\), sodium zincate is obtained as major product. \[\begin{array}{*{20}{l}} {{\rm{Zn}} + 2{\rm{NaOH}} \to \mathop {{\rm{N}}{{\rm{a}}_2}{\rm{Zn}}{{\rm{O}}_2} + {{\rm{H}}_2}}\limits_{{\mkern 1mu} {\rm{Sodium}}\,\,{\rm{zincate}}} }\\ {} \end{array}\]
CHXII08:THE D- & F-BLOCK ELEMENTS
321231
Which of the following is a constituent of lithopone?
1 \(\mathrm{ZnSO}_{4}\)
2 \(\mathrm{ZnS}\)
3 \(\mathrm{ZnCl}_{2}\)
4 \(\mathrm{ZnO}\)
Explanation:
Lithopone is \(\mathrm{BaSO}_{4} \cdot \mathrm{ZnS}\)
321228
Assertion : \(\mathrm{AgBr}\) is used in photography. Reason : \(\mathrm{AgBr}\) undergoes photochemical reaction.
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:
\(\mathrm{AgBr}\) is the most sensitive silver halide to photoreduction. Hence, it is used as the light sensitive material in photographic films. The unchanged \(\mathrm{AgBr}\) is dissolved in hypo solution to cast an image on photographic plate. \(2 \mathrm{AgBr} \xrightarrow{\text { hu }} 2 \mathrm{Ag}+\mathrm{Br}_{2}\). So option (1) is correct.
CHXII08:THE D- & F-BLOCK ELEMENTS
321229
Which is least soluble in water ?
1 \(\mathrm{\mathrm{AgCl}}\)
2 \(\mathrm{\mathrm{AgBr}}\)
3 \(\mathrm{\mathrm{AgI}}\)
4 \({\rm{A}}{{\rm{g}}_{\rm{2}}}{\rm{S}}\)
Explanation:
The solubility order is : \({\rm{AgF}} > {\rm{AgCl}} > {\rm{AgBr}} > {\rm{AgI}} > {\rm{A}}{{\rm{g}}_{\rm{2}}}{\rm{S}}\)
CHXII08:THE D- & F-BLOCK ELEMENTS
321230
When \(\mathrm{Zn}\) is treated with excess of \(\mathrm{NaOH}\), the product obtained is
1 \(\mathrm{Zn}(\mathrm{OH})_{2}\)
2 \(\mathrm{ZnOH}\)
3 \(\mathrm{Na}_{2} \mathrm{ZnO}_{2}\)
4 None of these
Explanation:
On treating zinc with excess of \(\mathrm{NaOH}\), sodium zincate is obtained as major product. \[\begin{array}{*{20}{l}} {{\rm{Zn}} + 2{\rm{NaOH}} \to \mathop {{\rm{N}}{{\rm{a}}_2}{\rm{Zn}}{{\rm{O}}_2} + {{\rm{H}}_2}}\limits_{{\mkern 1mu} {\rm{Sodium}}\,\,{\rm{zincate}}} }\\ {} \end{array}\]
CHXII08:THE D- & F-BLOCK ELEMENTS
321231
Which of the following is a constituent of lithopone?
1 \(\mathrm{ZnSO}_{4}\)
2 \(\mathrm{ZnS}\)
3 \(\mathrm{ZnCl}_{2}\)
4 \(\mathrm{ZnO}\)
Explanation:
Lithopone is \(\mathrm{BaSO}_{4} \cdot \mathrm{ZnS}\)
