Which one of the following statements is NOT correct ?
Question: Which one of the following statements is NOT correct ?Eutrophication indicates that water body is polluted ?The dissolved oxygen concentration below $6 \mathrm{ppm}$ inhibits fish growthEutrophication leads to increase in the oxygen level in waterEutrophication leads to anaerobic conditionsCorrect Option: , 3 Solution: Eutrophication leads to decrease in oxygen level of water. $3^{\text {rd }}$ statement is incorrect...
Read More →Isotope(s) of hydrogen which
Question: Isotope(s) of hydrogen which emits low energy $\beta^{-}$ particles with $t_{1 / 2}$ value $12$ years is/areProtiumTritiumDeuteriumDeuterium and TritiumCorrect Option: , 2 Solution: ${ }_{1}^{1} \mathrm{H}$ and ${ }_{1}^{2} \mathrm{H}$ are stable while ${ }_{1}^{3} \mathrm{H}$ is radioactive....
Read More →Solve this
Question: In the chemical reactions given above $\mathrm{A}$ and $\mathrm{B}$ respectively are :$\mathrm{H}_{3} \mathrm{PO}_{2}$ and $\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{Cl}$$\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{OH}$ and $\mathrm{H}_{3} \mathrm{PO}_{2}$$\mathrm{H}_{3} \mathrm{PO}_{2}$ and $\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{OH}$$\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{Cl}$ and $\mathrm{H}_{3} \mathrm{PO}_{2}$Correct Option: 1 Solution:...
Read More →The number of geometrical isomers found in
Question: The number of geometrical isomers found in the metal complexes $\left[\mathrm{PtCl}_{2}\left(\mathrm{NH}_{3}\right)_{2}\right]$, $\left[\mathrm{Ni}(\mathrm{CO})_{4}\right], \quad\left[\mathrm{Ru}\left(\mathrm{H}_{2} \mathrm{O}\right)_{3} \mathrm{Cl}_{3}\right] \quad$ and $\quad\left[\mathrm{CoCl}_{2}\left(\mathrm{NH}_{3}\right)_{4}\right]^{+}$ respectively, are:$1,1,1,1$$2,1,2,2$$2,0,2,2$$2,1,2,1$Correct Option: , 2 Solution:...
Read More →Which one of the following compounds contains
Question: Which one of the following compounds contains $\beta-C_{1}-C_{4}$ glycosidic linkage ?LactoseSucroseMaltoseAmyloseCorrect Option: 1 Solution: In Lactose it is $\beta \mathrm{C}_{1}-\mathrm{C}_{4}$ glycosidic linkage. In Maltose, Amylose $\alpha \mathrm{C}_{1}-\mathrm{C}_{4}$ glycosidic linkage is present...
Read More →Match List-I with List-II
Question: Match List-I with List-II Choose the correct answer from the options given below :(a)-(ii), (b)-(iii), (c)-(i) and (d)-(iv)(a)-(iv), (b)-(i), (c)-(ii) and (d)-(iii)(a)-(iii), (b)-(ii), (c)-(iv) and (d)-(i)(a)-(i), (b)-(iv), (c)-(ii) and (d)-(iii)Correct Option: 1 Solution: (a) 'Ba' having outer electronic configuration $6 \mathrm{~s}^{2}$. (b) $\mathrm{CaC}_{2} \mathrm{O}_{4}$ is water insoluble (c) 'Li' is soluble in organic solvents (d) $\mathrm{NaOH}$ is strong Monoacidic base among...
Read More →Match List-I with List-II :
Question: Match List-I with List-II : Choose the most appropriate answer from the(a)-(iv), (b)-(i), (c)-(ii), (d)-(iii)(a)-(iii), (b)-(iv), (c)-(ii), (d)-(i)(a)-(iii), (b)-(ii), (c)-(iv), (d)-(i)(a)-(iv), (b)-(ii), (c)-(i), (d)-(iii)Correct Option: , 4 Solution: Species (Number of lone pairs of electrons on the central atom)...
Read More →In the structure of the dichromate ion, there is a :
Question: In the structure of the dichromate ion, there is a :linear symmetrical $\mathrm{Cr}-\mathrm{O}-\mathrm{Cr}$ bond.non-linear symmetrical $\mathrm{Cr}-\mathrm{O}-\mathrm{Cr}$ bond.linear unsymmetrical $\mathrm{Cr}-\mathrm{O}-\mathrm{Cr}$ bond.non-linear unsymmetrical $\mathrm{Cr}-\mathrm{O}-\mathrm{Cr}$ bond.Correct Option: , 2 Solution: dichromate ion contain non-linear symmetrical Cr-O-Cr Bond...
Read More →Which of the following compounds
Question: Which of the following compounds does not exhibit resonance?$\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{OCH}=\mathrm{CH}_{2}$$\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{CONH}_{2}$$\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}=\mathrm{CHCH}_{2} \mathrm{NH}_{2}$Correct Option: , 4 Solution: $\mathrm{CH}_{3}-\mathrm{CH}_{2}-\mathrm{CH}=\mathrm{CH}-\mathrm{CH}_{2}-\mathrm{NH}_{2}$ No conjugation thus resonance is not possible....
Read More →The major component/ingredient of Portland Cement is :
Question: The major component/ingredient of Portland Cement is :tricalcium aluminatetricalcium silicatedicalcium aluminatedicalcium silicateCorrect Option: , 2 Solution: Major component of portland cement is "Tricalcium silicate $\left(51 \%, 3 \mathrm{CaO} . \mathrm{SiO}_{2}\right)$...
Read More →The type of hybridisation and magnetic property
Question: The type of hybridisation and magnetic property of the complex $\left[\mathrm{MnCl}_{6}\right]^{3-}$, respectively, are :$\mathrm{sp}^{3} \mathrm{~d}^{2}$ and diamagnetic$\mathrm{d}^{2} \mathrm{sp}^{3}$ and diamagnetic$\mathrm{d}^{2} \mathrm{sp}^{3}$ and paramagnetic$\mathrm{sp}^{3} \mathrm{~d}^{2}$ and paramagneticCorrect Option: , 4 Solution: $\left[\mathrm{MnCl}_{6}\right]^{3-}$ Paramagnetic and having 4 unpaired electrons....
Read More →Which of the following compounds
Question: Which of the following compounds will provide a tertiary alcohol on reaction with excess of $\mathrm{CH}_{3} \mathrm{MgBr}$ followed by hydrolysis?Correct Option: 1 Solution: Since the given question is single correct choice the best appropriate option is (A)...
Read More →The structure of the starting compound P used in the reaction given below is :
Question: The structure of the starting compound P used in the reaction given below is : Correct Option: 1 Solution: $\mathrm{NaOCl}$ is used in haloform reaction as reagent....
Read More →Select the graph that correctly describes the adsorption isotherms at two temperatures
Question: Select the graph that correctly describes the adsorption isotherms at two temperatures $T_{1}$ and $T_{2}$ $\left(\mathrm{T}_{1}\mathrm{T}_{2}\right)$ for a gas : $(\mathrm{x}-$ mass of the gas adsorbed ; $\mathrm{m}-$ mass of adsorbent; P-pressure) Correct Option: , 4 Solution: $\frac{\mathrm{x}}{\mathrm{m}} \alpha \mathrm{P}^{1 / \mathrm{n}}\left(0\frac{1}{\mathrm{n}}1\right)$ On Increasing temperature $\frac{x}{m}$ decreases. $\because$ adsorption is generally exothermic...
Read More →Given below are two statements:
Question: Given below are two statements: Statement I : Aniline is less basic than acetamide. Statement II : In aniline, the lone pair of electrons on nitrogen atom is delocalised over benzene ring due to resonance and hence less available to a proton. Choose the most appropriate option;Statement I is true but statement II is false.Statement $\mathrm{I}$ is false but statement II is true.Both statement I and statement II are true.Both statement I and statement II are false.Correct Option: , 2 So...
Read More →Which purification technique
Question: Which purification technique is used for high boiling organic liquid compound (decomposes near its boiling point)?Simple distillationSteam distillationFractional distillationReduced pressure distillationCorrect Option: , 4 Solution: Reduced pressure distillation or vacuum...
Read More →Which one of the following
Question: Which one of the following statements for D.I. Mendeleeff, is incorrect?He authored the textbook - Principles of Chemistry.vAt the time, he proposed Periodic Table of elements structure of atom was known.Element with atomic number 101 is named after him.He invented accurate barometer.Correct Option: , 2 Solution: At the time, he proposed the periodic table but structure of atom was unknown....
Read More →For a reaction of order
Question: For a reaction of order $\mathrm{n}$, the unit of the rate constant is :$\mathrm{mol}^{1-\mathrm{n}} \mathrm{L}^{1-\mathrm{n}} \mathrm{S}$$\mathrm{mol}^{1-\mathrm{n}} \mathrm{L}^{2 \mathrm{n}} \mathrm{s}^{-1}$$\mathrm{mol}^{1-\mathrm{n}} \mathrm{L}^{\mathrm{n}-1} \mathrm{~s}^{-1}$$\mathrm{mol}^{1-\mathrm{n}} \mathrm{L}^{1-\mathrm{n}} \mathrm{s}^{-1}$Correct Option: , 3 Solution: Rate $=\mathrm{k}[\mathrm{A}]^{\mathrm{n}}$ comparing units $\frac{(\mathrm{mol} / \ell)}{\mathrm{sec}}=\mat...
Read More →The correct order of reactivity of the given chlorides with acetate in acetic acid is :
Question: The correct order of reactivity of the given chlorides with acetate in acetic acid is :Correct Option: 1 Solution: As it is example of $\mathrm{SN}^{1}$. so carbocation stability $\uparrow$, reaction rate $\uparrow$...
Read More →The oxidation states of ' p ' in
Question: The oxidation states of ' $\mathrm{P}^{\prime}$ in $\mathrm{H}_{4} \mathrm{P}_{2} \mathrm{O}_{7}, \mathrm{H}_{4} \mathrm{P}_{2} \mathrm{O}_{5}$ and $\mathrm{H}_{4} \mathrm{P}_{2} \mathrm{O}_{6}$, respectively, are :7,5 and 65,4 and 35,3 and 46,4 and 5Correct Option: , 3 Solution: Oxidation state of $\mathrm{P}$ in $\mathrm{H}_{4} \mathrm{P}_{2} \mathrm{O}_{7}, \mathrm{H}_{4} \mathrm{P}_{2} \mathrm{O}_{5}$ and $\mathrm{H}_{4} \mathrm{P}_{2} \mathrm{O}_{6}$ is $5,3 \ 4$ respectively $2 x...
Read More →The water having more
Question: The water having more dissolved $\mathrm{O}_{2}$ is :boiling waterwater at $80^{\circ} \mathrm{C}$polluted waterwater at $4^{\circ} \mathrm{C}$Correct Option: 4, Solution: On heating concentration of $\mathrm{O}_{2}$ in water decreases. So boiling water and water at $80^{\circ} \mathrm{C}$ having less $\mathrm{O}_{2}$ concentration. Polluted water also having less $\mathrm{O}_{2}$ concentration. So water at $4^{\circ} \mathrm{C}$ having maximum $\mathrm{O}_{2}$ concentration....
Read More →In the following sequence of reactions, the final product D is :
Question: In the following sequence of reactions, the final product D is : Correct Option: 4, Solution:...
Read More →The parameters of the unit cell of a substance are
Question: The parameters of the unit cell of a substance are $\mathrm{a}=2.5, \mathrm{~b}=3.0, \mathrm{c}=4.0, \alpha=90^{\circ}, \beta=120^{\circ} \gamma=90^{\circ}$. The crystal system of the substance is :HexagonalOrthorhombicMonoclinicTriclinicCorrect Option: , 3 Solution: $\mathrm{a} \neq \mathrm{b} \neq \mathrm{c}$ and $\alpha=\gamma=90^{\circ} \neq \beta$ are parameters of monoclinic unit cell....
Read More →The product obtained from the electrolytic oxidation
Question: The product obtained from the electrolytic oxidation of acidified sulphate solutions, is :$\mathrm{HSO}_{4}^{-}$$\mathrm{HO}_{3} \mathrm{SOOSO}_{3} \mathrm{H}$$\mathrm{HO}_{2} \mathrm{SOSO}_{2} \mathrm{H}$$\mathrm{HO}_{3} \mathrm{SOSO}_{3} \mathrm{H}$Correct Option: , 2 Solution: Electrolysis of concentrated solution of acidified sulphate solution yields $\mathrm{H}_{2} \mathrm{~S}_{2} \mathrm{O}_{8}$....
Read More →Which one of the following compounds will give orange
Question: Which one of the following compounds will give orange precipitate when treated with 2,4-dinitrophenyl hydrazine?Correct Option: , 4 Solution: Explanation $\Rightarrow 2-4-\mathrm{D} . \mathrm{N} . \mathrm{P}$ test is used for carbonyl compound (aldehyde \ ketone)...
Read More →