Solve the Following Questions
Question: Correct statement about the given chemical reaction is :$-\ddot{\mathrm{NH}}_{2}$ group is ortho and para directive, so product (B) is not possible.Reaction is possible and compound (B) will be the major product.The reaction will form sulphonated product instead of nitration.Reaction is possible and compound (A) will be major product.Correct Option: , 4 Solution: Due to formation of anilinium ion by acid base reaction m-product is form as considerable amount....
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Question: Let $y=y(x)$ be the solution of the differential equation $\left(x-x^{3}\right) d y=\left(y+y x^{2}-3 x^{4}\right) d x, x2$. If $y(3)=3$, then $y(4)$ is equal to : 412816Correct Option: , 2 Solution: $\left(x-x^{3}\right) d y=\left(y+y x^{2}-3 x^{4}\right) d x$ $\Rightarrow x d y-y d x=\left(y x^{2}-3 x^{4}\right) d x+x^{3} d y$ $\Rightarrow \frac{x d y-y d x}{x^{2}}=(y d x+x d y)-3 x^{2} d x$ $\Rightarrow \mathrm{d}\left(\frac{\mathrm{y}}{\mathrm{x}}\right)=\mathrm{d}(\mathrm{xy})-\ma...
Read More →Which one of the following lanthanoids does not
Question: Which one of the following lanthanoids does not form $\mathrm{MO}_{2}$ ? [M is lanthanoid metal]$\operatorname{Pr}$Dy$\mathrm{Nd}$$\mathrm{Yb}$Correct Option: 1 Solution: $\mathrm{Yb}$ is the only element that do not form $\mathrm{MO}_{2}$ type oxide...
Read More →Compound A used as a strong oxidizing agent is amphoteric in nature.
Question: Compound A used as a strong oxidizing agent is amphoteric in nature. It is the part of lead storage batteries. Compound $A$ is :$\mathrm{PbO}_{2}$$\mathrm{PbO}$$\mathrm{PbSO}_{4}$$\mathrm{Pb}_{3} \mathrm{O}_{4}$Correct Option: 1 Solution: $\mathrm{PbO}_{2}$ is amphoteric and strong oxidizing agent and also a component of lead storage batteries....
Read More →The correct order of acid character
Question: The correct order of acid character of the following compounds is : $\mathrm{III}\mathrm{II}\mathrm{I}\mathrm{IV}$$\mathrm{IV}\mathrm{III}\mathrm{II}\mathrm{I}$$\mathrm{I}\mathrm{II}\mathrm{III}\mathrm{IV}$$\mathrm{II}\mathrm{III}\mathrm{IV}\mathrm{I}$Correct Option: , 4 Solution: $2341$...
Read More →When 9.45 g of ClCH2COOH is added to 500 mL of water,
Question: When $9.45 \mathrm{~g}$ of $\mathrm{ClCH}_{2} \mathrm{COOH}$ is added to 500 $\mathrm{mL}$ of water, its freezing point drops by $0.5^{\circ} \mathrm{C}$. The dissociation constant of $\mathrm{Cl} \mathrm{CH}_{2} \mathrm{COOH}$ is $x \times 10^{-3}$. The value of $x$ is____________ (Rounded off to the nearest integer) $\left[\mathrm{K}_{\mathrm{f}\left(\mathrm{H}_{2} \mathrm{O}\right)}=1.86 \mathrm{~K} \mathrm{~kg} \mathrm{~mol}^{-1}\right]$ Solution: $\mathrm{ClCH}_{2} \mathrm{COOH} \...
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Question: B reacts with Hydroxyl amine but does not give Tollen's test. Identify A and B1,1 -Dichlorobutane and 2-Butanone2,2 -Dichlorobutane and Butanal1,1 -Dichlorobutane and Butanal2,2 -Dichlorobutane and 2 -butan-oneCorrect Option: , 4 Solution:...
Read More →Water does not produce
Question: Water does not produce $\mathrm{CO}$ on reacting with:$\mathrm{CO}_{2}$$\mathrm{C}$$\mathrm{CH}_{4}$$\mathrm{C}_{3} \mathrm{H}_{8}$Correct Option: 1 Solution: $\mathrm{CO}_{2}+\mathrm{H}_{2} \mathrm{O} \rightarrow \mathrm{H}_{2} \mathrm{CO}_{3}$ $\mathrm{C}+\mathrm{H}_{2} \mathrm{O}($ steam $) \rightarrow \mathrm{CO}+\mathrm{H}_{2}$ $\left.\begin{array}{c}\mathrm{CH}_{4}+\mathrm{H}_{2} \mathrm{O} \rightarrow \mathrm{CO}+3 \mathrm{H}_{2} \\ \mathrm{C}_{3} \mathrm{H}_{8}+\mathrm{H}_{2} \...
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Question: The area of the region bounded by $\mathrm{y}-\mathrm{x}=2$ and $\mathrm{x}^{2}=\mathrm{y}$ is equal to :- $\frac{16}{3}$$\frac{2}{3}$$\frac{9}{2}$$\frac{4}{3}$Correct Option: , 3 Solution: $y-x=2, x^{2}=y$ Now, $x^{2}=2+x$ $\Rightarrow x^{2}-x-2=0$ $\Rightarrow(x+1)(x-2)=0$ Area $=\int_{-1}^{2}\left(2+x-x^{2}\right)$ $=\left|2 x+\frac{x^{2}}{2}-\frac{x^{3}}{3}\right|_{-1}^{2}$ $=\left(4+2-\frac{8}{3}\right)-\left(-2+\frac{1}{2}+\frac{1}{3}\right)$ $=6-3+2-\frac{1}{2}=\frac{9}{2}$...
Read More →The correct sequence of reagents
Question: The correct sequence of reagents used in the preparation of 4-bromo-2-nitroethyl benzene from benzene is :$\mathrm{HNO}_{3} / \mathrm{H}_{2} \mathrm{SO}_{4}, \mathrm{Br}_{2} / \mathrm{AlCl}_{3}, \mathrm{CH}_{3} \mathrm{COCl} / \mathrm{AlCl}_{3}$,$\mathrm{Zn}-\mathrm{Hg} / \mathrm{HCl}$$\mathrm{Br}_{2} / \mathrm{AlBr}_{3}, \mathrm{CH}_{3} \mathrm{COCl} / \mathrm{AlCl}_{3}, \mathrm{HNO}_{3} / \mathrm{H}_{2} \mathrm{SO}_{4}$,$\mathrm{Zn} / \mathrm{HCl}$$\mathrm{CH}_{3} \mathrm{COCl} / \ma...
Read More →The major product of the following reaction is:
Question: The major product of the following reaction is: Correct Option: , 3 Solution:...
Read More →Solve this following Let the mean and variance of the frequency distribution
Question: Let the mean and variance of the frequency distribution be 6 and $6.8$ respectively. If $x_{3}$ is changed from 8 to 7 , then the mean for the new data will be: 45$\frac{17}{3}$$\frac{16}{3}$Correct Option: , 3 Solution: Given $32+8 \alpha+9 \beta=(8+\alpha+\beta) \times 6$ $\Rightarrow 2 \alpha+3 \beta=16$ .............(I) Also, $4 \times 16+4 \times \alpha+9 \beta=(8+\alpha+\beta) \times 6.8$ $\Rightarrow 640+40 \alpha+90 \beta=544+68 \alpha+68 \beta$ $\Rightarrow 28 \alpha-22 \beta=...
Read More →Which of the following is correct
Question: Which of the following is correct structure of $\alpha$-anomer of maltose ?Correct Option: , 4 Solution: $\alpha-A N O M E R$ OF MALTOSE maltose is disaccharides of $\alpha-\mathrm{D}-$ glucopyranose by $\mathrm{C}_{1}-\mathrm{C}_{4}$ glycosidic linkage...
Read More →Which of the following vitamin is helpful in delaying the blood clotting -
Question: Which of the following vitamin is helpful in delaying the blood clotting -Vitamin $\mathrm{C}$Vitamin BVitamin EVitamin $\mathrm{K}$Correct Option: , 4 Solution: Vitamin helpful in delaying the blood clotting is Vitamin $\mathrm{K}$...
Read More →Carbylamine test is used to detect
Question: Carbylamine test is used to detect the presence of primary amino group in an organic compound. Which of the following compound is formed when this test is performed with aniline?Correct Option: , 4 Solution: CARBYL amine given by $1^{\circ}$ amine...
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Question: If $\tan \left(\frac{\pi}{9}\right), x, \tan \left(\frac{7 \pi}{18}\right) \quad$ are in arithmetic progression and $\tan \left(\frac{\pi}{9}\right), \mathrm{y}, \tan \left(\frac{5 \pi}{18}\right)$ are also in arithmetic progression, then $|x-2 y|$ is equal to : 4301Correct Option: , 3 Solution: $x=\frac{1}{2}\left(\tan \frac{\pi}{9}+\tan \frac{7 \pi}{18}\right)$ and $2 \mathrm{y}=\tan \frac{\pi}{9}+\tan \frac{5 \pi}{18}$ so, $x-2 y=\frac{1}{2}\left(\tan \frac{\pi}{9}+\tan \frac{7 \pi}...
Read More →Which of the following is 'a' FALSE statement?
Question: Which of the following is 'a' FALSE statement?Carius tube is used in the estimation of sulphur in an organic compoundCarius method is used for the estimation of nitrogen in an organic compoundPhosphoric acid produced on oxidation of phosphorus present in an organic compound is precipitated as $\mathrm{Mg}_{2} \mathrm{P}_{2} \mathrm{O}_{7}$ by adding magnesia mixture.Kjeldahl's method is used for the estimation of nitrogen in an organic compoundCorrect Option: , 2 Solution: Carius metho...
Read More →Which among the following species
Question: Which among the following species has unequal bond lengths ?$\mathrm{BF}_{4}^{-}$$\mathrm{XeF}_{4}$$\mathrm{SF}_{4}$$\mathrm{SiF}_{4}$Correct Option: , 3 Solution:...
Read More →A student appeared in an examination consisting of 8 true-false type questions.
Question: A student appeared in an examination consisting of 8 true-false type questions. The student guesses the answers with equal probability. The smallest value of $\mathrm{n}$, so that the probability of guessing at least ' $n$ ' correct answers is less than $\frac{1}{2}$, is :5634Correct Option: 1 Solution: $\mathrm{P}(\mathrm{E})\frac{1}{2}$ $\Rightarrow \sum_{\mathrm{r}=\mathrm{n}}^{8}{ }^{8} \mathrm{C}_{\mathrm{r}}\left(\frac{1}{2}\right)^{8-\mathrm{r}}\left(\frac{1}{2}\right)^{\mathrm{...
Read More →On treating a compound with warm dil.
Question: On treating a compound with warm dil. $\mathrm{H}_{2} \mathrm{SO}_{4}$, gas $\mathrm{X}$ is evolved which turns $\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}$ paper acidified with dil. $\mathrm{H}_{2} \mathrm{SO}_{4}$ to a green compound $\mathrm{Y} . \mathrm{X}$ and $\mathrm{Y}$ respectively are -$\mathrm{X}=\mathrm{SO}_{2}, \mathrm{Y}=\mathrm{Cr}_{2} \mathrm{O}_{3}$$\mathrm{X}=\mathrm{SO}_{3}, \mathrm{Y}=\mathrm{Cr}_{2} \mathrm{O}_{3}$$\mathrm{X}=\mathrm{SO}_{2}, \mathrm{Y}=\mathrm{...
Read More →Which of the following compound gives pink colour on reaction with phthalic anhydride in conc.
Question: Which of the following compound gives pink colour on reaction with phthalic anhydride in conc. $\mathrm{H}_{2} \mathrm{SO}_{4}$ followed by treatment with $\mathrm{NaOH}$ ?Correct Option: 1 Solution:...
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Question: Let $\mathbb{C}$ be the set of all complex numbers. Let $\mathrm{S}_{1}=\{\mathrm{z} \in \mathbb{C}:|\mathrm{z}-2| \leq 1\}$ and $\mathrm{S}_{2}=\{\mathrm{z} \in \mathbb{C}: \mathrm{z}(1+\mathrm{i})+\overline{\mathrm{Z}}(1-\mathrm{i}) \geq 4\}$ Then, the maximum value of $\left|\mathrm{z}-\frac{5}{2}\right|^{2}$ for $\mathrm{z} \in \mathrm{S}_{1} \cap \mathrm{S}_{2}$ is equal to : $\frac{3+2 \sqrt{2}}{4}$$\frac{5+2 \sqrt{2}}{2}$$\frac{3+2 \sqrt{2}}{2}$$\frac{5+2 \sqrt{2}}{4}$Correct Op...
Read More →For the given reaction :
Question: For the given reaction : $\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{NH}_{2}$Correct Option: , 4 Solution:...
Read More →Identify A and B in the chemical reaction.
Question: Identify $\mathrm{A}$ and $\mathrm{B}$ in the chemical reaction. Correct Option: , 4 Solution: $\Rightarrow$ Ist reaction marcovnikov's addition of $\mathrm{HCl}$ on double bond while $2^{\text {nd }}$ reaction is halide substitution by finkelstein reaction....
Read More →Identify products A and B :
Question: Identify products A and B : Correct Option: , 2 Solution:...
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