Expermentally it was found that a metal oxide has formula
Question: Expermentally it was found that a metal oxide has formula $\mathrm{M}_{0.98} \mathrm{O}$. Metal $\mathrm{M}$, is present as $\mathrm{M}^{2+}$ and $\mathrm{M}^{3+}$ in its oxide. Fraction of the metal which exists as $\mathrm{M}^{3+}$ would be :-7.01%4.08%6.05%5.08Correct Option: , 2 Solution:...
Read More →Which of the following represents the correct order of increasing first ionization enthalpy for
Question: Which of the following represents the correct order of increasing first ionization enthalpy for $\mathrm{Ca}, \mathrm{Ba}, \mathrm{S}$, Se and Ar ?$\mathrm{Ca}\mathrm{S}\mathrm{Ba}\mathrm{Se}\mathrm{Ar}$$\mathrm{S}\mathrm{Se}\mathrm{Ca}\mathrm{Ba}\mathrm{Ar}$$\mathrm{Ba}\mathrm{Ca}\mathrm{Se}\mathrm{S}\mathrm{Ar}$$\mathrm{Ca}\mathrm{Ba} \mathrm{S}\mathrm{Se}\mathrm{Ar}$Correct Option: , 3 Solution: Solution Not Required...
Read More →For the estimation of nitrogen, 1.4 g of an organic compound was digested by Kjeldahl method and the evolved ammonia was absorbed in 60 mL of
Question: For the estimation of nitrogen, $1.4 \mathrm{~g}$ of an organic compound was digested by Kjeldahl method and the evolved ammonia was absorbed in $60 \mathrm{~mL}$ of $\frac{\mathrm{M}}{10}$ sulphuric acid. The unreacted acid required $20 \mathrm{~mL}$ of $\frac{\mathrm{M}}{10}$ sodium hydroxide for complete neutralizaton. The percentage of nitrogen in the compound is :3%5%6%10%Correct Option: , 2 Solution:...
Read More →An element having an atomic radius of 0.14 nm crystallizes in an
Question: An element having an atomic radius of 0.14 nm crystallizes in an fcc unit cell. What is the length of a side of the cell ?0.96 nm0.4 nm0.24 nm0.56 nmCorrect Option: , 2 Solution:...
Read More →The increasing order of the ionic radii of the given isoelectronic species is ?
Question: The increasing order of the ionic radii of the given isoelectronic species is ? $\mathrm{K}^{+}, \mathrm{S}^{2-}, \mathrm{Ca}^{2+}, \mathrm{Cl}^{-}$$\mathrm{Cl}^{-}, \mathrm{Ca}^{2+}, \mathrm{K}^{+}, \mathrm{S}^{2-}$$\mathrm{S}^{2-}, \mathrm{Cl}^{-}, \mathrm{Ca}^{2+}, \mathrm{K}^{+}$$\mathrm{Ca}^{2+}, \mathrm{K}^{+}, \mathrm{Cl}^{-}, \mathrm{S}^{2-}$Correct Option: , 4 Solution: Solution Not Required...
Read More →The amount of
Question: The amount of $\mathrm{BaSO}_{4}$ formed upon mixing $100 \mathrm{~mL}$ of $20.8 \% \mathrm{BaCl}_{2}$ solution with $50 \mathrm{~mL}$ of $9.8 \% \mathrm{H}_{2} \mathrm{SO}_{4}$ solution will be : $(\mathrm{Ba}=137, \mathrm{Cl}=35.5, \mathrm{~S}=32, \mathrm{H}=1$ and $\mathrm{O}=16)$33.2 g11.65 g23.3 g30.6 gCorrect Option: , 4 Solution:...
Read More →Which one of the following statements about packing in solids is
Question: Which one of the following statements about packing in solids is incorrect ?Void space in ccp mode of packing is 26%Coordination number in hcp mode of packing is 12Void space in hcp mode of packing is 32%Coordination number in bcc mode of packing is 8Correct Option: , 3 Solution: Theory based...
Read More →The density of 3M solution of sodium chloride is 1.252 g
Question: The density of $3 \mathrm{M}$ solution of sodium chloride is $1.252 \mathrm{~g} \mathrm{~mL}^{-1}$. The molality of the solution will be (molar mass, $\mathrm{NaCl}=58.5 \mathrm{~g} \mathrm{~mol}^{-1}$ )2.18 m3.00 m2.60 m2.79 mCorrect Option: 1 Solution:...
Read More →In a face centred cubic lattice, atoms of A form the corner points and atoms of
Question: In a face centred cubic lattice, atoms of A form the corner points and atoms of B form the face centred points. If two atoms of A are missing from the corner points, the formula of the ionic compound is$\mathrm{AB}_{2}$$\mathrm{AB}_{3}$$\mathrm{AB}_{4}$$A_{2} B_{5}$Correct Option: , 3 Solution:...
Read More →10 mL of 2(M) NaOH solution is added to 200 mL of 0.5 (M) of NaOH solution
Question: $10 \mathrm{~mL}$ of $2(\mathrm{M}) \mathrm{NaOH}$ solution is added to $200 \mathrm{~mL}$ of $0.5(\mathrm{M})$ of $\mathrm{NaOH}$ solution. What is the final concentration ?0.57 M5.7 M11.4 M1.14 MCorrect Option: 1 Solution:...
Read More →10 mL of 2(M) NaOH solution is added to 200 mL of 0.5 (M) of NaOH solution
Question: $10 \mathrm{~mL}$ of $2(\mathrm{M}) \mathrm{NaOH}$ solution is added to $200 \mathrm{~mL}$ of $0.5(\mathrm{M})$ of $\mathrm{NaOH}$ solution. What is the final concentration ?0.57 M5.7 M11.4 M1.14 MCorrect Option: Solution:...
Read More →Among the following the incorrect statement is
Question: Among the following the incorrect statement is :-Density of crystals remains unaffecfted due to Frenkel defectIn BCC unit cell the void space is 32%Electrical conductivity of semiconductors and metals increases with increase in temperatureDensity of crystals decreases due to Schottky defectCorrect Option: , 3 Solution: Theory Based...
Read More →The concentrated sulphuric acid that is peddled commercially is
Question: The concentrated sulphuric acid that is peddled commercially is $95 \% \mathrm{H}_{2} \mathrm{SO}_{4}$ by weight. If the density of this commerical acid is $1.834 \mathrm{~g} \mathrm{~cm}^{-3}$, the molarity of this solution is :-17.8 M15.7 M10.5 M12.0 MCorrect Option: 1 Solution:...
Read More →The correct order of electron gain enthalpy with negative sign
Question: The correct order of electron gain enthalpy with negative sign of $\mathrm{F}, \mathrm{Cl}, \mathrm{Br}$ and $\mathrm{I}$, having atomic number $9,17,35$ and 53 respectively, is ? $\mathrm{I}\mathrm{Br}\mathrm{Cl}\mathrm{F}$$\mathrm{F}\mathrm{Cl}\mathrm{Br}\mathrm{I}$$\mathrm{Cl}\mathrm{F}\mathrm{Br}\mathrm{I}$$\mathrm{Br}\mathrm{Cl}\mathrm{I}\mathrm{F}$Correct Option: 3, Solution: Solution Not Required...
Read More →For which of the following
Question: For which of the following molecule significant $\mu \neq 0$ Only (III)(III) and (IV)Only (I)(I) and (II)Correct Option: , 2 Solution:...
Read More →The density of a solution prepared by dissolving 120 g of urea
Question: The density of a solution prepared by dissolving $120 \mathrm{~g}$ of urea (mol. mass $=60 \mathrm{u}$ ) in $1000 \mathrm{~g}$ of water is $1.15 \mathrm{~g} / \mathrm{mL}$. The molarity of this solution is2.05 M0.50 M1.78 M1.02 MCorrect Option: 1 Solution:...
Read More →A solid has 'bcc' structure. If the distance of nearest approach between two atoms is
Question: A solid has 'bcc' structure. If the distance of nearest approach between two atoms is 1.73 Å, the edge length of the cell is :-314.20 pm216 pm200 pm1.41 pmCorrect Option: , 3 Solution:...
Read More →The set representing the correct order of ionic radius is ?
Question: The set representing the correct order of ionic radius is ? $\mathrm{Li}^{+}\mathrm{Na}^{+}\mathrm{Mg}^{2+}\mathrm{Be}^{2+}$$\mathrm{Mg}^{2+}\mathrm{Be}^{2+}\mathrm{Li}^{+}\mathrm{Na}^{+}$$\mathrm{Li}^{+}\mathrm{Be}^{2+}\mathrm{Na}^{+}\mathrm{Mg}^{2+}$$\mathrm{Na}^{+}\mathrm{Li}^{+}\mathrm{Mg}^{2+}\mathrm{Be}^{2+}$Correct Option: , 4 Solution: Solution Not Required...
Read More →Arrange in the correct order
Question: Arrange in the correct order of stability (decreasing order) for the following molecules: (I) $$ (II) $$ (III) $$ (IV)$(\mathrm{IV})(\mathrm{III})(\mathrm{II}) \approx(\mathrm{I})$$(\mathrm{III})(\mathrm{I}) \approx(\mathrm{II})(\mathrm{IV})$$(\mathrm{I})(\mathrm{II}) \approx(\mathrm{III})(\mathrm{IV})$Correct Option: 3, Solution:...
Read More →A 5.2 molal aqueous solution of methyl alcohol,
Question: A $5.2$ molal aqueous solution of methyl alcohol, $\mathrm{CH}_{3} \mathrm{OH}$, is supplied. What is the mole fraction of methyl alcohol in the solution ?0.0860.0500.1000.190Correct Option: 1 Solution: $5.2 \mathrm{~m} \mathrm{CH}_{3} \mathrm{OH}$ ie $5.2 \mathrm{~mol} \mathrm{CH} \mathrm{CH}_{3}$ present in $1 \mathrm{~kg}$ water...
Read More →Ammonium chloride crystallizes in a body centred cubic lattice with
Question: Ammonium chloride crystallizes in a body centred cubic lattice with edge length of unit cell of 390 pm. If the size of chloride ion is180 pm, the size of ammonium ion would be:158 pm174 pm142 pm126 pmCorrect Option: 1 Solution:...
Read More →Monocarboxylic acids are functional isomers of :
Question: Monocarboxylic acids are functional isomers of :EstersAminesEthersAlcoholsCorrect Option: 1 Solution:...
Read More →The ratio of mass percent of C and H of an organic compound
Question: The ratio of mass percent of $\mathrm{C}$ and $\mathrm{H}$ of an organic compound $\left(\mathrm{C}_{\mathrm{X}} \mathrm{H}_{\mathrm{Y}} \mathrm{O}_{\mathrm{Z}}\right)$ is $6: 1$. If one molecule of the above compound $\left(\mathrm{C}_{\mathrm{X}} \mathrm{H}_{\mathrm{Y}} \mathrm{O}_{\mathrm{Z}}\right)$ contains half as much oxygen as required to burn one molecule of compound $\mathrm{C}_{\mathrm{X}} \mathrm{H}_{\mathrm{Y}}$ completely to $\mathrm{CO}_{2}$ and $\mathrm{H}_{2} \mathrm{O...
Read More →The radius of a calcium ion is 94 pm and of the oxide ion is 146 pm.
Question: The radius of a calcium ion is 94 pm and of the oxide ion is 146 pm. The possible crystal structure of calcium oxide will be :-OctahedralTetrahedralPyramidalTrigonalCorrect Option: 1 Solution:...
Read More →An alkali is titrated against an acid with methyl orange as indicator,
Question: An alkali is titrated against an acid with methyl orange as indicator, which of the following is a correct combination ?Strong Strong Pinkish red to yellowWeak Strong Yellow to pinkish redStrong Strong Pink to colourlessWeak Strong Colourless to pinkCorrect Option: , 2 Solution:...
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