Which of the following electrolytes
Question: Which of the following electrolytes will have maximum coagulating value for AgI/Ag+ sol? (i) Na2S (ii) Na3PO4 (iii) Na2SO4 (iv) NaCl Solution: Option (ii)Na3PO4 is the answer....
Read More →Freshly prepared precipitate sometimes
Question: Freshly prepared precipitate sometimes gets converted to colloidal solution by ___________. (i) coagulation (ii) electrolysis (iii) diffusion (iv) peptisation Solution: Option (iv) is the answer....
Read More →The method by which lyophobic
Question: The method by which lyophobic sol can be protected. (i) By the addition of oppositely charged sol. (ii) By the addition of an electrolyte. (iii) By the addition of lyophilic sol. (iv) By boiling. Solution: Option (iii)By the addition of lyophilic sol is the answer....
Read More →Which of the following will show
Question: Which of the following will show the Tyndall effect? (i) An aqueous solution of soap below critical micelle concentration. (ii) An aqueous solution of soap above critical micelle concentration. (iii) An aqueous solution of sodium chloride. (iv) An aqueous solution of sugar. Solution: Option (ii) An aqueous solution of soap above critical micelle concentrationis the answer....
Read More →At high concentration of soap in water,
Question: At high concentration of soap in water, soap behaves as ____________. (i) molecular colloid (ii) associated colloid (iii) macromolecular colloid (iv) lyophilic colloid Solution: Option (ii)associated colloidis the answer....
Read More →In which of the following reactions heterogeneous
Question: In which of the following reactions heterogeneous catalysis is involved? (a) 2SO2(g) + O2(g) [NO(g)] 2SO3(g) (b) 2SO2(g) [Pt(s)] 2SO3(g) (c) N2(g) + 3H2(g) [Fe(s)] 2NH3(g) (d) CH3COOCH3(l) + H2O (l) [HCl(l)] CH3COOH (aq) + CH3OH (aq) Solution: Option (i)2SO2(g) + O2(g) [NO(g)] 2SO3(g)is the answer....
Read More →Based on data given below to predict
Question: Based on data given below to predict which of the following gases shows the least adsorption on a definite amount of charcoal? (i) CO2 (ii) SO2 (iii) CH4 (iv) H2 Solution: Option (iv)H2 is the answer....
Read More →Which of the following is an example
Question: Which of the following is an example of absorption? (i) Water on silica gel (ii) Water on calcium chloride (iii) Hydrogen on finely divided nickel (iv) Oxygen on the metal surface Solution: Option (ii)Water on calcium chloride is the answer....
Read More →In physisorption adsorbent does not show
Question: In physisorption adsorbent does not show specificity for any particular gas because ______________. (i) involved van der Waals forces are universal. (ii) gases involved behave like ideal gases. (iii) enthalpy of adsorption is low. (iv) it is a reversible process. Solution: Option (i)involved van der Waals forces are universal is the answer....
Read More →Evaluate the following integrals:
Question: Evaluate the following integrals: $\int \sin x \log (\cos x) d x$ Solution: Let $\mathrm{I}=\int \sin \mathrm{x} \log (\cos \mathrm{x}) \mathrm{dx}$ Put $\cos x=t$ $-\sin x d x=d t$ $I=\int-\log t d t$ Using integration by parts, $=\int 1 \times-\log t d t$ $=-\left(\log \mathrm{t} \int \mathrm{dt}-\int \frac{\mathrm{d}}{\mathrm{dt}} \log \mathrm{t} \int 1 \mathrm{dt}\right)$ $=-\left(\mathrm{t} \log \mathrm{t}-\int \frac{1}{\mathrm{t}} \times \mathrm{t} \mathrm{dt}\right)$ $=-\left(\m...
Read More →Physical adsorption of a gaseous species
Question: Physical adsorption of a gaseous species may change to chemical adsorption with ______________. (i) decrease in temperature (ii) increase in temperature (iii) increase in surface area of the adsorbent (iv) the decrease in surface area of the adsorbent Solution: Option (ii)increase in temperature is the answer....
Read More →Mark the tick against the correct answer in the following:
Question: Mark the tick against the correct answer in the following: Let $A$ be the set of all points in a plane and let $O$ be the origin. Let $R=\{(P, Q): O P=Q Q\} .$ Then, $R$ is A. reflexive and symmetric but not transitive B. reflexive and transitive but not symmetric C. symmetric and transitive but not reflexive D. an equivalence relation There is printing mistake in the question... $\mathrm{R}$ should be $\mathrm{R}=\{(\mathrm{P}, \mathrm{Q}): \mathrm{OP}=\mathrm{OQ}\}$ Instead of $\math...
Read More →Which of the following is not a favourable
Question: Which of the following is not a favourable condition for physical adsorption? (i) high pressure (ii) negative ∆H (iii) the higher critical temperature of adsorbate (iv) high temperature Solution: Option (iv)high temperature is the answer....
Read More →Which one of the following is not applicable
Question: Which one of the following is not applicable to the phenomenon of adsorption? (i) ∆H 0 (ii) ∆G 0 (iii) ∆S 0 (iv) ∆H 0 Solution: Option (i)∆H 0 is the answer....
Read More →The extent of adsorption of adsorbate from
Question: The extent of adsorption of adsorbate from the solution phase increases with ________. (i) increase in the amount of adsorbate in solution. (ii) the decrease in surface area of the adsorbent. (iii) increase in temperature of the solution. (iv) the decrease in the amount of adsorbate in solution Solution: Option (i)increase in the amount of adsorbate in solution is the answer....
Read More →Extent of physisorption of a gas increases
Question: Extent of physisorption of a gas increases with ___________. (i) increase in temperature. (ii) the decrease in temperature. (iii) the decrease in surface area of the adsorbent. (iv) the decrease in strength of van der Waals forces. Solution: Option (ii)the decrease in temperature is the answer....
Read More →The term ‘sorption’ stands for ____________.
Question: The term sorption stands for ____________. (i) absorption (ii) adsorption (iii) both absorption and adsorption (iv) desorption Solution: Option (iii)both absorption and adsorption is the answer....
Read More →Evaluate the following integrals:
Question: Evaluate the following integrals: Solution: Let $I=\int x \sin x \cos x d x=\frac{1}{2} \int x \times 2 \sin x \cos x d x$ We know that, $\sin 2 x=2 \sin x \cos x$ $=\frac{1}{2} \int x \sin 2 x$ Using integration by parts, $=\frac{1}{2}\left(x \int \sin 2 x d x-\int \frac{d}{d x} x \int \sin 2 x d x\right)$ We have, $\int \sin n x=\frac{-\cos n x}{n}$ and $\int \cos n x=\frac{\sin n x}{n}$ $=\frac{1}{2}\left(\frac{x}{2}-\cos 2 x+\int \frac{\cos 2 x d x}{2}\right)$ $=\frac{1}{2}\left(-\...
Read More →Which of the following interface cannot
Question: Which of the following interface cannot be obtained? (i) liquid-liquid (ii) solid-liquid (iii) liquid-gas (iv) gas-gas Solution: Option (iv) gas-gas is the answer....
Read More →At the equilibrium position in
Question: At the equilibrium position in the process of adsorption ___________. (i) ∆H 0 (ii) ∆H = T∆S (iii) ∆H T∆S (iv) ∆H T∆S Solution: Option (ii)∆H = T∆Sis the answer....
Read More →Which of the following process does not
Question: Which of the following process does not occur at the interface of phases? (i) crystallisation (ii) heterogeneous catalysis (iii) homogeneous catalysis (iv) corrosion Solution: Option (iii)homogeneous catalysisis the answer....
Read More →Mark the tick against the correct answer in the following:
Question: Mark the tick against the correct answer in the following: Let $R$ be a relation on $N \times N$, defined by $(a, b) R(c, d) \Leftrightarrow a+d=b+c .$ Then, $R$ is A. reflexive and symmetric but not transitive B. reflexive and transitive but not symmetric C. symmetric and transitive but not reflexive D. an equivalence relation Solution: According to the question , $R=\{(a, b),(c, d): a+d=b+c\}$ Formula For a relation $R$ in set $A$ Reflexive The relation is reflexive if $(a, a) \in R$...
Read More →Evaluate the following integrals:
Question: Evaluate the following integrals: $\int x^{3} \cos x^{2} d x$ Solution: Let $I=\int x^{3} \cos x^{2} d x$ Put $x^{2}=t$ $2 x d x=d t$ $I=\frac{1}{2} \int t \cos t d t$ Using integration by parts, $\mathrm{I}=\frac{1}{2}\left(\mathrm{t} \int \cos \mathrm{t} \mathrm{dt}-\int \frac{\mathrm{d}}{\mathrm{dt}} \mathrm{t} \int \cos \mathrm{dt}\right)$ $=\frac{1}{2}\left(\mathrm{t} \times \sin \mathrm{t}-\int \sin \mathrm{t} \mathrm{dt}\right)$ $=\frac{1}{2}(\operatorname{tsin} t+\cos t)+c$ Sub...
Read More →Mark the tick against the correct answer in the following:
Question: Mark the tick against the correct answer in the following: Let $S$ be the set of all real numbers and let $R$ be a relation on $S$ defined by $a R b \Leftrightarrow a^{2}+b^{2}=1 .$ Then, $R$ is A. symmetric but neither reflexive nor transitive B. reflexive but neither symmetric nor transitive C. transitive but neither reflexive nor symmetric D. none of these Solution: According to the question, Given set $S=\{\ldots \ldots,-2,-1,0,1,2 \ldots \ldots\}$ And $R=\left\{(a, b): a, b \in S\...
Read More →Evaluate the following integrals:
Question: Evaluate the following integrals: $\int 2 x^{3} e^{x^{2}} d x$ Solution: Let $\mathrm{I}=\int 2 \mathrm{x}^{3} \mathrm{e}^{\mathrm{x}^{2}} \mathrm{dx}$ Put $x^{2}=t$ $2 x d x=d t$ $I=\int t e^{t} d t$ Using integration by parts, $=\mathrm{t} \int \mathrm{e}^{\mathrm{t}} \mathrm{dt}-\int \frac{\mathrm{d}}{\mathrm{dt}} \mathrm{t} \int \mathrm{e}^{\mathrm{t}} \mathrm{dt}$ We have, $\int e^{x} d x=e^{x}$ $=t e^{t}-e^{t}+c$ $=e^{t}(t-1)+c$ Substitute value for $t$, $I=e^{x^{2}}\left(x^{2}-1...
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