The coordination number of
Question: The coordination number of $\mathrm{Th}$ in $\mathrm{K}_{4}\left[\mathrm{Th}\left(\mathrm{C}_{2} \mathrm{O}_{4}\right]_{4}\left(\mathrm{OH}_{2}\right)_{2}\right]$ is :- $\left(\mathrm{C}_{2} \mathrm{O}_{4}^{2-}=\right.$ Oxalato $)$610148Correct Option: , 2 Solution: $\mathrm{C}_{2} \mathrm{O}_{4}^{2-}$ (oxalato): bidentate $\mathrm{H}_{2} \mathrm{O}$ (aqua) : Monodentate...
Read More →What is the work function of the metal if the light of wavelength
Question: What is the work function of the metal if the light of wavelength $4000 \AA$ generates photoelectrons of velocity $6 \times 10^{5} \mathrm{~ms}^{-1}$ form it ? (Mass of electron $=9 \times 10^{-31} \mathrm{~kg}$ Velocity of light $=3 \times 10^{8} \mathrm{~ms}^{-1}$ Planck's constant $=6.626 \times 10^{-34} \mathrm{Js}$ Charge of electron $=1.6 \times 10^{-19} \mathrm{JeV}^{-1}$ )$0.9 \mathrm{eV}$$4.0 \mathrm{eV}$$2.1 \mathrm{eV}$$3.1 \mathrm{eV}$Correct Option: , 3 Solution:...
Read More →Prove the following
Question: $\underline{\mathrm{A}} \stackrel{4 \mathrm{KOH}, \mathrm{O}_{2}}{\longrightarrow} 2 \underline{\mathrm{B}}+2 \mathrm{H}_{2} \mathrm{O}$ $3 \underline{\mathrm{B}} \stackrel{4 \mathrm{HCl}}{\longrightarrow} \underset{(\text { Purple) }}{2} \underline{\mathrm{C}}+\mathrm{MnO}_{2}+2 \mathrm{H}_{2} \mathrm{O}$ $2 \underline{\mathrm{B}} \stackrel{\mathrm{H}_{2} \mathrm{O}, \mathrm{KI}}{\longrightarrow} 2 \underline{\mathrm{A}}+2 \mathrm{KOH}+\underline{\mathrm{D}}$ In the above sequence of ...
Read More →In the following reactions, products A and B are :
Question: In the following reactions, products A and B are : Correct Option: , 4 Solution:...
Read More →25ml of the given HCl solution requires
Question: $25 \mathrm{ml}$ of the given $\mathrm{HCl}$ solution requires $30 \mathrm{~mL}$ of $0.1 \mathrm{M}$ sodium carbonate solution. What is the volume of this $\mathrm{HCl}$ solution required to titrate $30 \mathrm{~mL}$ of $0.2 \mathrm{M}$ aqueous $\mathrm{NaOH}$ solution?$25 \mathrm{~mL}$$50 \mathrm{~mL}$$12.5 \mathrm{~mL}$$75 \mathrm{~mL}$Correct Option: 1, Solution:...
Read More →Water samples with BOD values of $4 mathrm{ppm}$ and 18 ppm, respectively, are :
Question: Water samples with BOD values of $4 \mathrm{ppm}$ and 18 ppm, respectively, are :Highly polluted and CleanHighly polluted and Highly pollutedClean and Highly pollutedClean and CleanCorrect Option: , 3 Solution: Clean water would have BOD value of less than $5 \mathrm{ppm}$ whereas highly polluted water could have a $B O D$ value of $17 \mathrm{ppm}$ or more....
Read More →Match the following items in column I with
Question: Match the following items in column I with the corresponding items in column II. (i) $\rightarrow(\mathrm{C}) ;$ (ii) $\rightarrow(\mathrm{B}) ;$ (iii) $\rightarrow(\mathrm{D}) ;$ (iv) $\rightarrow(\mathrm{A})$(i) $\rightarrow(\mathrm{C}) ;$ (ii) $\rightarrow(\mathrm{D}) ;($ iii $) \rightarrow(\mathrm{B}) ;$ (iv) $\rightarrow(\mathrm{A})$(i) $\rightarrow(\mathrm{D}) ;$ (ii) $\rightarrow(\mathrm{A}) ;($ iii $) \rightarrow(\mathrm{B}) ;$ (iv $) \rightarrow(\mathrm{C})$(i) $\rightarrow(\m...
Read More →In the Hall-Heroult process, aluminium is formed at the cathode. The cathode is made out of :
Question: In the Hall-Heroult process, aluminium is formed at the cathode. The cathode is made out of :PlatinumCarbonPure aluminiumCopperCorrect Option: , 2 Solution: In the Hall-Heroult process the cathode is made of carbon....
Read More →Which of the following compounds reacts
Question: Which of the following compounds reacts with ethylmagnesium bromide and also decolourizes bromine water solution :-Correct Option: , 4 Solution:...
Read More →The relative stability of
Question: The relative stability of $+1$ oxidation state of group 13 elements follows the order :-$\mathrm{Al}\mathrm{Ga}\mathrm{Tl}\mathrm{In}$$\mathrm{Tl}\mathrm{In}\mathrm{Ga}\mathrm{Al}$$\mathrm{Al}\mathrm{Ga}\mathrm{In}\mathrm{Tl}$$\mathrm{Ga}\mathrm{Al}\mathrm{In}\mathrm{Tl}$Correct Option: , 3 Solution: Due to inert pair effect as we move down the group in $13^{\text {th }}$ group lower oxidation state becomes more stable. $\mathrm{Al}\mathrm{Ga}\mathrm{In}\mathrm{T} \ell$...
Read More →Which of the following compounds will produce
Question: Which of the following compounds will produce a precipitate with $\mathrm{AgNO}_{3}$ ?Correct Option: , 4 Solution:...
Read More →The molecule that has minimum/no role in the formation of photochemical smog, is :
Question: The molecule that has minimum/no role in the formation of photochemical smog, is :$\mathrm{CH}_{2}=\mathrm{O}$$\mathrm{N}_{2}$$\mathrm{O}_{2}$$\mathrm{NO}$Correct Option: , 2 Solution: Chiefly $\mathrm{NO}_{2}, \mathrm{O}_{3}$ and hydrocarbon are responsible for build up smog....
Read More →A compound ' 'X' on treatment with
Question: A compound ' 'X' on treatment with $\mathrm{Br}_{2} / \mathrm{NaOH}$, provided $\mathrm{C}_{3} \mathrm{H}_{9} \mathrm{~N}$, which gives positive carbylamine test. Compound ' $\mathrm{X}$ ' is :-$\mathrm{CH}_{3} \mathrm{COCH}_{2} \mathrm{NHCH}_{3}$$\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{COCH}_{2} \mathrm{NH}_{2}$$\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{CONH}_{2}$$\mathrm{CH}_{3} \mathrm{CON}\left(\mathrm{CH}_{3}\right)_{2}$Correct Option: , 3 Solution:...
Read More →The reaction 2 X → B is a zeroth order reaction.
Question: The reaction $2 X \rightarrow B$ is a zeroth order reaction. If the initial concentration of $\mathrm{X}$ is $0.2 \mathrm{M}$, the half-life is $6 \mathrm{~h}$. When the initial concentration of $\mathrm{X}$ is $0.5 \mathrm{M}$, the time required to reach its final concentration of $0.2 \mathrm{M}$ will be :-$18.0 \mathrm{~h}$$7.2 \mathrm{~h}$$9.0 \mathrm{~h}$$12.0 \mathrm{~h}$Correct Option: 1 Solution:...
Read More →The reaction 2 X → B is a zeroth order reaction.
Question: The reaction $2 X \rightarrow B$ is a zeroth order reaction. If the initial concentration of $\mathrm{X}$ is $0.2 \mathrm{M}$, the half-life is $6 \mathrm{~h}$. When the initial concentration of $\mathrm{X}$ is $0.5 \mathrm{M}$, the time required to reach its final concentration of $0.2 \mathrm{M}$ will be :-$18.0 \mathrm{~h}$$7.2 \mathrm{~h}$$9.0 \mathrm{~h}$$12.0 \mathrm{~h}$Correct Option: 1 Solution:...
Read More →The standard electrode potential
Question: The standard electrode potential $\mathrm{E}^{\ominus}$ and its temeprature coefficient $\left(\frac{\mathrm{dE}^{\ominus}}{\mathrm{dT}}\right)$ for a cell are $2 \mathrm{~V}$ and $-5 \times 10^{-4} \mathrm{VK}^{-1}$ at $300 \mathrm{~K}$ respectively. The cell reaction is $\mathrm{Zn}(\mathrm{s})+\mathrm{Cu}^{2+}(\mathrm{aq}) \rightarrow \mathrm{Zn}^{2+}(\mathrm{aq})+\mathrm{Cu}(\mathrm{s})$ The standard reaction enthalpy $\left(\Delta_{r} \mathrm{H}^{\ominus}\right)$ at 300 $\mathrm{K...
Read More →The de Broglie wavelength
Question: The de Broglie wavelength $(\lambda)$ associated with a photoelectron varies with the frequency $(v)$ of the incident radiation as, $\left[v_{0}\right.$ is thrshold frequency]:$\lambda \propto \frac{1}{\left(v-v_{0}\right)^{\frac{3}{2}}}$$\lambda \propto \frac{1}{\left(\mathrm{v}-\mathrm{v}_{0}\right)^{\frac{1}{2}}}$$\lambda \propto \frac{1}{\left(v-v_{0}\right)^{\frac{1}{4}}}$$\lambda \propto \frac{1}{\left(v-v_{0}\right)}$Correct Option: , 2 Solution:...
Read More →K2Hgl4 is 40% ionised in aqueous solution.
Question: $\mathrm{K}_{2} \mathrm{HgI}_{4}$ is $40 \%$ ionised in aqueous solution. The value of its van't Hoff factor (i) is :-$1.8$$2.2$$2.0$$1.6$Correct Option: 1 Solution:...
Read More →The standard reaction Gibbs energy for a chemical reaction
Question: The standard reaction Gibbs energy for a chemical reaction at ansolute temperature $\mathrm{T}$ is given by $\Delta_{\mathrm{r}} \mathrm{G}^{\mathrm{o}}=\mathrm{A}-\mathrm{Bt}$ Where $A$ and $B$ are non-zero constants. Which of the following is TRUE about this reaction?Exothermic if $\mathrm{B}0$Exothermic if $\mathrm{A}0$ and $\mathrm{B}0$Endothermic if $\mathrm{A}0$ and $\mathrm{B}0$Endothermic if $\mathrm{A}0$Correct Option: , 4 Solution: Theory...
Read More →The hydride that is NOT electron deficient is:-
Question: The hydride that is NOT electron deficient is:-$\mathrm{B}_{2} \mathrm{H}_{6}$$\mathrm{AlH}_{3}$$\mathrm{SiH}_{4}$$\mathrm{GaH}_{3}$Correct Option: , 3 Solution: (1) $\mathrm{B}_{2} \mathrm{H}_{6}$ : Electron deficient (2) $\mathrm{AlH}_{3}$ : Electron deficient (3) $\mathrm{SiH}_{4}$ : Electron precise (4) $\mathrm{GaH}_{3}$ : Electron deficient...
Read More →For diatomic ideal gas in a closed system, which of the following plots does
Question: For diatomic ideal gas in a closed system, which of the following plots does not correctly describe the relation between various thermodynamic quantities ?Correct Option: , 2 Solution:...
Read More →Given the equilibrium constant :
Question: Given the equilibrium constant : $\mathrm{KC}$ of the reaction : $\mathrm{Cu}(\mathrm{s})+2 \mathrm{Ag}^{+}(\mathrm{aq}) \rightarrow \mathrm{Cu}^{2+}(\mathrm{aq})+2 \mathrm{Ag}(\mathrm{s})$ is $10 \times 10^{15}$, calculate the $E_{\text {cell }}^{0}$ of this reaction at $298 \mathrm{~K}$ $\left[2.303 \frac{\mathrm{RT}}{\mathrm{F}}\right.$ at $\left.298 \mathrm{~K}=0.059 \mathrm{~V}\right]$$0.04736 \mathrm{~V}$$0.4736 \mathrm{~V}$$0.4736 \mathrm{mV}$$0.04736 \mathrm{mV}$Correct Option:...
Read More →The reaction,
Question: The reaction, $\mathrm{MgO}(\mathrm{s})+\mathrm{C}(\mathrm{s}) \rightarrow \mathrm{Mg}(\mathrm{S})+\mathrm{CO}(\mathrm{g})$, for which $\Delta_{\mathrm{r}} \mathrm{H}^{\circ}$ $=+491.1 \mathrm{~kJ} \mathrm{~mol}^{-1}$ and $\Delta_{\mathrm{r}} \mathrm{S}^{\circ}=198.0 \mathrm{JK}^{-1} \mathrm{~mol}^{-}$ 1 , is not feasible at $298 \mathrm{~K}$. Temperature above which reaction will be feasible is :-$1890.0 \mathrm{~K}$$2480.3 \mathrm{~K}$$2040.5 \mathrm{~K}$$2380.5 \mathrm{~K}$Correct O...
Read More →Solve this following
Question: Given On the basis of data given above, predict which of the following gases shows least adsorption on a definite amount of charcoal?$\mathrm{H}_{2}$$\mathrm{CH}_{4}$$\mathrm{SO}_{2}$$\mathrm{CO}_{2}$Correct Option: 1 Solution:...
Read More →The reaction that does NOT define calcination is:-
Question: The reaction that does NOT define calcination is:-$\mathrm{ZnCO}_{3} \stackrel{\Delta}{\longrightarrow} \mathrm{ZnO}+\mathrm{CO}_{2}$$\mathrm{Fe}_{2} \mathrm{O}_{3} \cdot \mathrm{XH}_{2} \mathrm{O} \stackrel{\Delta}{\longrightarrow} \mathrm{Fe}_{2} \mathrm{O}_{3}+\mathrm{XH}_{2} \mathrm{O}$$\mathrm{CaCO}_{3} \cdot \mathrm{MgCO}_{3} \stackrel{\Delta}{\longrightarrow} \mathrm{CaO}+\mathrm{MgO}+2 \mathrm{CO}_{2}$$2 \mathrm{Cu}_{2} \mathrm{~S}+3 \mathrm{O}_{2} \stackrel{\Delta}{\longrighta...
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