Choose the incorrect statement.
- AThe $F^-$ ion makes the enamel on teeth much harder by converting hydroxyapatite,$[3Ca_3(PO_4)_2 \cdot Ca(OH)_2]$,the enamel on the surface of the teeth,into much harder fluoroapatite $[3Ca_3(PO_4)_2 \cdot CaF_2]$.
- BExcess nitrate in drinking water can cause diseases such as methemoglobinemia (blue baby syndrome).
- CHydrogen peroxide $(H_2O_2)$ is used for the purpose of bleaching clothes in the process of laundry.
- DNone of these
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Similar Questions
How can you apply Green Chemistry for the following?
$(a)$ To reduce photochemical smog.
$(b)$ To avoid the use of chlorinated solvents and chlorinated bleaching agents in dry cleaning.
$(c)$ To reduce the use of synthetic detergents.
$(d)$ To reduce the consumption of petrol and diesel.
$(a)$ To reduce photochemical smog.
$(b)$ To avoid the use of chlorinated solvents and chlorinated bleaching agents in dry cleaning.
$(c)$ To reduce the use of synthetic detergents.
$(d)$ To reduce the consumption of petrol and diesel.
The primary pollutant that leads to photochemical smog is
DifficultJEE MAIN 2019
View SolutionWhat is the full form of $COD$?
Easy
View SolutionWhich of the following metals causes water pollution?
Easy
View SolutionMatch List-$I$ with List-$II$.
List-$I$ List-$II$ $(a)$ $2 SO_{2(g)} + O_{2(g)} \rightarrow 2 SO_{3(g)}$ $(i)$ Acid rain $(b)$ $HOCl_{(g)} \stackrel{h \nu}{\longrightarrow} \dot{O}H + \dot{Cl}$ $(ii)$ Smog $(c)$ $CaCO_{3} + H_{2}SO_{4} \rightarrow CaSO_{4} + H_{2}O + CO_{2}$ $(iii)$ Ozone depletion $(d)$ $NO_{2(g)} \stackrel{h \nu}{\longrightarrow} NO_{(g)} + O_{(g)}$ $(iv)$ Tropospheric pollution
Choose the correct answer from the options given below.
| List-$I$ | List-$II$ |
|---|---|
| $(a)$ $2 SO_{2(g)} + O_{2(g)} \rightarrow 2 SO_{3(g)}$ | $(i)$ Acid rain |
| $(b)$ $HOCl_{(g)} \stackrel{h \nu}{\longrightarrow} \dot{O}H + \dot{Cl}$ | $(ii)$ Smog |
| $(c)$ $CaCO_{3} + H_{2}SO_{4} \rightarrow CaSO_{4} + H_{2}O + CO_{2}$ | $(iii)$ Ozone depletion |
| $(d)$ $NO_{2(g)} \stackrel{h \nu}{\longrightarrow} NO_{(g)} + O_{(g)}$ | $(iv)$ Tropospheric pollution |
Choose the correct answer from the options given below.
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