When gypsum is heated to
Question: When gypsum is heated to $393 \mathrm{~K}$, it forms :Dead burnt plasterAnhydrous $\mathrm{CaSO}_{4}$$\mathrm{CaSO}_{4} .5 \mathrm{H}_{2} \mathrm{O}$$\mathrm{CaSO}_{4} \cdot 0.5 \mathrm{H}_{2} \mathrm{O}$Correct Option: , 4 Solution:...
Read More →A chromatography column, packed with silica gel as stationary phase,
Question: A chromatography column, packed with silica gel as stationary phase, was used to separate a mixture of compounds consisting of (A) benzanilide (B) aniline and $(\mathrm{C})$ acetophenone. When the column is eluted with a mixture of solvents, hexane : ethyl acetate $(20: 80)$, the sequence of obtained compounds :$(B),(C)$ and $(A)$$(C),(A)$ and $(B)$$(A),(B)$ and $(C)$$(B),(A)$ and $(C)$Correct Option: , 2 Solution:...
Read More →The major product of the following reaction is:
Question: The major product of the following reaction is: Correct Option: , 2 Solution:...
Read More →Arrange the following compounds in increasing
Question: Arrange the following compounds in increasing order of $\mathrm{C}-\mathrm{OH}$ bond length : methanol, phenol, p-ethoxyphenolphenol methanol p-ethoxyphenolphenol p-ethoxyphenol $$ methanolmethanol $$ p-ethoxyphenol $$ phenolmethanol $$ phenol $$ p-ethoxyphenolCorrect Option: , 2 Solution:...
Read More →Two open beakers one containing a solvent and the other containing a mixture
Question: Two open beakers one containing a solvent and the other containing a mixture of that solvent with a non volatile solute are together sealed in a container. Over time -The volume of the solution does not change and the volume of the solvent decreasesThe volume of the solution decrease and the volume of the solvent increasesThe volume of the solution increase and the volume of the solvent decreasesThe volume of the solution and the solvent does not changeCorrect Option: , 3 Solution: The...
Read More →For the Balmer series in the spectrum of
Question: For the Balmer series in the spectrum of $\mathrm{H}$ atom, $\quad \bar{v}=\mathrm{R}_{\mathrm{H}}\left\{\frac{1}{\mathrm{n}_{1}^{2}}-\frac{1}{\mathrm{n}_{2}^{2}}\right\}, \quad$ the correct statements among (I) and (IV) are : (I) As wavelength decreases, the lines in the series converge (II) The integer $n_{1}$ is equal to 2 (III) The lines of longest wavelength corresponds to $\mathrm{n}_{2}=3$ (IV) The ionization energy of hydrogen can be calculated from wave number of these lines(I...
Read More →In the following reaction sequence
Question: In the following reaction sequence Correct Option: 1 Solution:...
Read More →The major products A and B in the following reactions are :
Question: The major products A and B in the following reactions are : Correct Option: 1 Solution:...
Read More →The equation that is incorrect is -
Question: The equation that is incorrect is -$\left(\Lambda_{\mathrm{m}}^{0}\right)_{\mathrm{NaBr}}-\left(\Lambda_{\mathrm{m}}^{0}\right)_{\mathrm{Nal}}=\left(\Lambda_{\mathrm{m}}^{0}\right)_{\mathrm{KBr}}-\left(\Lambda_{\mathrm{m}}^{0}\right)_{\mathrm{NaBr}}$$\left(\Lambda_{\mathrm{m}}^{0}\right)_{\mathrm{H}_{2} \mathrm{O}}=\left(\Lambda_{\mathrm{m}}^{0}\right)_{\mathrm{HCl}}+\left(\Lambda_{\mathrm{m}}^{0}\right)_{\mathrm{NaOH}}-\left(\Lambda_{\mathrm{m}}^{0}\right)_{\mathrm{NaCl}}$$\left(\Lamb...
Read More →As per Hardy-Schulze formulation,
Question: As per Hardy-Schulze formulation, the flocculation values of the following for ferric hydroxide sol are in the order:$\mathrm{AlCl}_{3}\mathrm{K}_{3}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]\mathrm{K}_{2} \mathrm{CrO}_{4}\mathrm{KBr}=\mathrm{KNO}_{3}$$\mathrm{K}_{3}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]\mathrm{K}_{2} \mathrm{CrO}_{4}\mathrm{AlCl}_{3}\mathrm{KBr}\mathrm{KNO}_{3}$$\mathrm{K}_{3}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]\mathrm{AlCl}_{3}\mathrm{K}_{2} \mathrm{CrO}_{4}\m...
Read More →Solve this following
Question: The bond order and the magnetic characteristics of $\mathrm{CN}^{-}$are :3 , diamagnetic$2 \frac{1}{2}$, paramagnetic3, paramagnetic$2 \frac{1}{2}$, diamagneticCorrect Option: 1 Solution:...
Read More →Among the gases (a) - (e),
Question: Among the gases (a) - (e), the gases that cause greenhouse effect are : (a) $\mathrm{CO}_{2}$ (b) $\mathrm{H}_{2} \mathrm{O}$ (c) $\mathrm{CFCs}$ (d) $\mathrm{O}_{2}$ (e) $\mathrm{O}_{3}$(a), (b), (c) and (d)(a), (c), (d) and (e)(a) and (d)(a), (b), (c) and (e)Correct Option: , 4 Solution: $\mathrm{CO}_{2}, \mathrm{H}_{2} \mathrm{O}, \mathrm{CFCs}$ and $\mathrm{O}_{3}$ are green house gases....
Read More →Which of the following statements is correct-
Question: Which of the following statements is correct-Gluconic acid can form cyclic (acetal/ hemiacetal) structureGluconic acid is a partial oxidation product of glucoseGluconic acid is obtained by oxidation of glucose with $\mathrm{HNO}_{3}$Gluconic acid is a dicarboxylic acidCorrect Option: , 2 Solution:...
Read More →A graph of vapour pressure and temperature for
Question: A graph of vapour pressure and temperature for three different liquids $\mathrm{X}, \mathrm{Y}$ and $\mathrm{Z}$ is shown below : (A) $\mathrm{X}$ has higher intermolecular interactions compared to $\mathrm{Y}$. (B) X has lower intermolecular interactions compared to $\mathrm{Y}$. (C) $\mathrm{Z}$ has lower intermolecular interactions compared to $\mathrm{Y}$. The correct inference(s) is/are :$\mathrm{A}$(C)(B)(A) and (C)Correct Option: , 3 Solution: Order of B.P. is : $\mathrm{Z}\math...
Read More →Which of the following statement is not true for glucose?
Question: Which of the following statement is not true for glucose?The pentaacetate of glucose does not react with hydroxylamine to give oximeGlucose gives Schiff's test for aldehydeGlucose exists in two crystalline forms $\alpha$ and $\beta$Glucose reacts with hydroxylamine to form oximeCorrect Option: , 2 Solution: Glucose gives negative test with Schiff reagent...
Read More →Solve this following
Question: In the following reactions products $(A)$ and (B), respectively, are : $\mathrm{NaOH}+\mathrm{Cl}_{2} \rightarrow(\mathrm{A})+$ side products (hot and conc.) $\mathrm{Ca}(\mathrm{OH})_{2}+\mathrm{Cl}_{2} \rightarrow(\mathrm{B})+$ side products (dry)$\mathrm{NaClO}_{3}$ and $\mathrm{Ca}(\mathrm{OCl})_{2}$$\mathrm{NaOCl}$ and $\mathrm{Ca}\left(\mathrm{ClO}_{3}\right)_{2}$$\mathrm{NaClO}_{3}$ and $\mathrm{Ca}\left(\mathrm{ClO}_{3}\right)_{2}$$\mathrm{NaOCl}$ and $\mathrm{Ca}(\mathrm{OCl})...
Read More →The rate of a certain biochemical reaction
Question: The rate of a certain biochemical reaction at physiological temperature (T) occurs $10^{6}$ times faster with enzyme than without. The change in the activation energy upon adding enzyme is:$-6 \mathrm{RT}$+6RT+6(2.303)RT$-6(2.303) \mathrm{RT}$Correct Option: , 4 Solution:...
Read More →The number of bonds between sulphur and
Question: The number of bonds between sulphur and oxygen atoms in $\mathrm{S}_{2} \mathrm{O}_{8}^{2-}$ and the number of bonds between sulphur and sulphur atoms in rhombic sulphur, respectively, are :4 and 84 and 68 and 88 and 6Correct Option: , 3 Solution: $\mathrm{S}_{2} \mathrm{O}_{8}^{2-}:$...
Read More →The decreasing order of reactivity towards
Question: The decreasing order of reactivity towards dehydrohalogenation $\left(E_{1}\right)$ reaction of the following compounds is : $\mathrm{B}\mathrm{D}\mathrm{A}\mathrm{C}$$\mathrm{B}\mathrm{D}\mathrm{C}\mathrm{A}$$\mathrm{D}\mathrm{B}\mathrm{C}\mathrm{A}$$\mathrm{B}\mathrm{A}\mathrm{D}\mathrm{C}$Correct Option: , 3 Solution: Reactivity $\mathrm{D}\mathrm{B}\mathrm{C}\mathrm{A}$ Carbocation formed from D is most stable Carbocation formed from $A$ is least stable...
Read More →Among the statements(a)-(d), the incorrect ones are-
Question: Among the statements(a)-(d), the incorrect ones are- (a) Octahedral Co(III) complexes with strong field ligands have very high magnetic moments (b) When $\Delta_{0}P$, the d-electron configuration of Co(III) in an octahedral complex is $t_{e g}^{4} e_{g}^{2}$ (c) Wavelength of light absorbed by $\left[\mathrm{Co}(\mathrm{en})_{3}\right]^{3+}$ is lower than that of $\left[\mathrm{CoF}_{6}\right]^{3-}$ (d) If the $\Delta_{0}$ for an octahedral complex of $\mathrm{Co}$ (III) is $18,000 \m...
Read More →The stoichiometry and solubility product of a salt
Question: The stoichiometry and solubility product of a salt with the solubility curve given below is, respectively : $\mathrm{X}_{2} \mathrm{Y}, 2 \times 10^{-9} \mathrm{M}^{3}$$\mathrm{XY}_{2}, 1 \times 10^{-9} \mathrm{M}^{3}$$\mathrm{XY}_{2}, 4 \times 10^{-9} \mathrm{M}^{3}$XY, $2 \times 10^{-6} \mathrm{M}^{3}$Correct Option: , 3 Solution: From the graph \ dimensions salt is : $\mathrm{XY}_{2}$ ${[\mathrm{X}]=1 \times 10^{-3} \mathrm{M} }$ ${[\mathrm{Y}]=2 \times 10^{-3} \mathrm{M} }$ $\mathr...
Read More →The redox reaction among the following is:
Question: The redox reaction among the following is:Combination of dinitrogen with dioxygen at $2000 \mathrm{~K}$Formation of ozone from atmosphereic oxygen in the presence of sunlightReaction of $\mathrm{H}_{2} \mathrm{SO}_{4}$ with $\mathrm{NaOH}$Reaction of $\left[\mathrm{Co}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right] \mathrm{Cl}_{3}$ with $\mathrm{AgNO}_{3}$Correct Option: 1 Solution:...
Read More →Within each pair of elements of
Question: Within each pair of elements of $\mathrm{F}$ \ $\mathrm{Cl}, \mathrm{S} \ \mathrm{Se}$, and Li \ Na, respectively, the elements that release more energy upon an electron gain are-F, Se and $\mathrm{Na}$$\mathrm{F}, \mathrm{S}$ and $\mathrm{Li}$$\mathrm{Cl}, \mathrm{S}$ and $\mathrm{Li}$$\mathrm{Cl}, \mathrm{Se}$ and $\mathrm{Na}$Correct Option: , 3 Solution:...
Read More →The strength of an aqueous
Question: The strength of an aqueous $\mathrm{NaOH}$ solution is most accurately determined by titrating : (Note : consider that an appropriate indicator is used)$\mathrm{Aq} . \mathrm{NaOH}$ in a volumetric flask and concentrated $\mathrm{H}_{2} \mathrm{SO}_{4}$ in a conical flask$\mathrm{Aq} . \mathrm{NaOH}$ in a pipette and aqueous oxalic acid in a burette$\mathrm{Aq} . \mathrm{NaOH}$ in a burette and concentrated $\mathrm{H}_{2} \mathrm{SO}_{4}$ in a conical flask$\mathrm{Aq} . \mathrm{NaOH}...
Read More →The predominant intermolecular forces present
Question: The predominant intermolecular forces present in ethyl acetate, a liquid, are :hydrogen bonding and London dispersionDipole-dipole and hydrogen bondingLondon dispersion and dipole-dipoleLondon dispersion, dipole-dipole and hydrogen bondingCorrect Option: , 3 Solution:...
Read More →