MCQ 11 MarkA solution has $pH =5$, then how many $\left[ OH ^{-}\right]$are present in solution :A9B5✓$10^{-9}$D$10^{-5}$AnswerCorrect option: C. $10^{-9}$CView full question & answer→
MCQ 21 MarkThe equilibrium constant for reaction $H _2+ I _2 \rightleftharpoons$ 2 HI will change :Aon increasing concentration of $H _2$ and $I _2$Bon increasing pressure✓on increasing temperatureDon adding catalystAnswerCorrect option: C. on increasing temperatureCView full question & answer→
MCQ 31 MarkThe solubility product of $SnS _2$ is represented as :A$\left[ Sn ^{+2}\right]\left[ S ^{-2}\right]^2$✓$\left[ Sn ^{+4}\right]\left[ S ^{-2}\right]^2$C$\left[ Sn ^{+4}\right]\left[2 S^{-2}\right]$D$\left[ Sn ^{+2}\right]\left[ S ^{-2}\right]$AnswerCorrect option: B. $\left[ Sn ^{+4}\right]\left[ S ^{-2}\right]^2$BView full question & answer→
MCQ 41 MarkHow many molecules of $H _2 O$ are present in one litre water?✓$55.5 \times 6.022 \times 10^{23}$B$55.5 \times 6.022 \times 10^{16}$C$55.5 \times 10^{-1}$D$55.5 \times 10^{-4}$AnswerCorrect option: A. $55.5 \times 6.022 \times 10^{23}$AView full question & answer→
MCQ 51 MarkWhich of the following species work as proton donator and acceptor both?A$CO _3^{-2}$B$SO _4^{-2}$✓$HSO _4^{-}$D$H _3 O ^{+}$AnswerCorrect option: C. $HSO _4^{-}$CView full question & answer→
MCQ 61 MarkWhat will be the effect on pH when 1 liter water is added to 2 liter solution of mixture of $CH _3 COOH$ and $CH _3 COONa$ :Awill decreaseBincrease✓will remain unchangedDNone of the aboveAnswerCorrect option: C. will remain unchangedCView full question & answer→
MCQ 71 MarkWhich of the following base is weakest :✓$Cl ^{-}$B$HCO _3^{-}$C$OH ^{-}$D$H ^{-}$AnswerCorrect option: A. $Cl ^{-}$AView full question & answer→
MCQ 81 MarkThe pH of $10^{-8} N HCl$ solution is :A6B8✓almost 7Dbetween 7 and 8AnswerCorrect option: C. almost 7CView full question & answer→
MCQ 91 MarkThe conjugate acid of $NH _2{ }^{-}$is :A$NH _4^{+}$B$N _2 H _4$✓$NH _3$DNone of theseAnswerCorrect option: C. $NH _3$CView full question & answer→
MCQ 101 MarkIf 15 gm of nitric oxide (NO) is present in a flask of two liter capacity, what will be its active mass?A1.00B0.75✓0.50D0.25AnswerCorrect option: C. 0.50CView full question & answer→
MCQ 111 MarkPrecipitation of an electrolyte will occur when its ionic product is:Aequal to solubility productBless than solubility product✓more than solubility productDis almost zeroAnswerCorrect option: C. more than solubility productCView full question & answer→
MCQ 121 MarkThe equilibrium constant for reaction $P _{4(s)}+5 O _{2(g)}$ $\rightleftharpoons P _4 O _{10(s)}$ is :A$K _{ c }=\left[ O _2\right]^5$B$K _{ c }=\frac{\left[ P _4 O _{10}\right]}{\left[ P _4\right]\left[ O _2\right]^5}$C$K _{ c }=\frac{\left[ P _4\right]\left[ O _2\right]^5}{\left[ P _4 O _{10}\right]}$✓$K _{ c }=\frac{1}{\left[ O _2\right]^5}$AnswerCorrect option: D. $K _{ c }=\frac{1}{\left[ O _2\right]^5}$DView full question & answer→
MCQ 131 MarkThe ionic product of water $\left(K_w\right)$ will increase :✓On increasing temperatureBOn increasing concentration of $OH ^{-}$COn increasing concentration of $H ^{+}$DOn reducing pressureAnswerCorrect option: A. On increasing temperatureAView full question & answer→
MCQ 141 MarkThe concentration of H+on 25°C will be:✓$10^{-7} M$B1 MC7 MD$10^{-14} M$AnswerCorrect option: A. $10^{-7} M$AView full question & answer→
MCQ 151 MarkThe solubility of a less soluble salt having formula $M _2 Y$ will be : ( $K _{\text {sp }}=$ solubility product constant)A$\sqrt{ K _{ sp }}$✓$\left(\frac{ K _{ sp }}{4}\right)^{\frac{1}{3}}$C$\left( K _{ sp }\right)^{\frac{1}{3}}$D$\left(\frac{ K _{ sp }}{2}\right)^{\frac{1}{2}}$AnswerCorrect option: B. $\left(\frac{ K _{ sp }}{4}\right)^{\frac{1}{3}}$BView full question & answer→
MCQ 161 MarkThe pH of mixture of $50 mL \frac{ N }{10} NaOH$ and 10 ml $\frac{ N }{2} H _2 SO _4$ is :A1B5✓7D10AnswerCorrect option: C. 7CView full question & answer→
MCQ 171 MarkWhich of the following pair will show common ion effect :A$KCl + HCl$B$NaOH + KOH$✓$CH _3 COOH + CH _3 COONa$D$HCl + H _2 SO _4$AnswerCorrect option: C. $CH _3 COOH + CH _3 COONa$CView full question & answer→
MCQ 181 MarkWhich of the following aqueous solution of compound have maximum pH?A$NH _4 Cl$B$Na _2 CO _3$✓NaOHDNaClAnswerCorrect option: C. NaOHCView full question & answer→
MCQ 191 MarkThe expression of equilibrium constant $\left( K _{ c }\right)$ for reaction $3 A+ B \rightleftharpoons 2 C$ will be :A$\frac{[ C ]}{[ A ][ B ]}$✓$\frac{[C]^2}{[A]^3[B]}$C$\frac{[ C ]^3}{[A]^2[B]}$D$\frac{[3 A][ B ]}{[2 C ]}$AnswerCorrect option: B. $\frac{[C]^2}{[A]^3[B]}$BView full question & answer→
MCQ 201 MarkIn equilibrium of reaction $PCl _5 \rightleftharpoons PCl _3+ Cl _2$, at constant pressure if inert gas is added, the dissociation will be :Aless✓moreCremain unchangedDcan't determineAnswerCorrect option: B. moreBView full question & answer→
MCQ 211 MarkFor reversible reaction $H _2+ I _2 \rightleftharpoons 2 HI$, the relationship between $K_p$ and $K_c$ is :A$K _{ p }= K _{ c }( RT )^2$✓$K _{ p }= K _{ c }$C$K _{ c }= K _{ p }( RT )^{-2}$D$K _{ p }= K _{ c }( RT )^{-1}$AnswerCorrect option: B. $K _{ p }= K _{ c }$BView full question & answer→
MCQ 221 MarkIf concentration of reactants and products are doubled then value of equilibrium constant KC is equal to which of the following:A$2 K_{ c }$B$\frac{K_c}{2}$C$K _{ c }^2$✓remain unchangedAnswerCorrect option: D. remain unchangedDView full question & answer→