Chlorine water on standing loses its colour and forms :-
Question: Chlorine water on standing loses its colour and forms :-$\mathrm{HCl}$ and $\mathrm{HClO}_{2}$HCl only$\mathrm{HOCl}$ and $\mathrm{HOCl}_{2}$$\mathrm{HCl}$ and $\mathrm{HOCl}$Correct Option: , 4 Solution:...
Read More →Oxidation state of sulphur
Question: Oxidation state of sulphur in anions $\mathrm{SO}_{3}^{2-} \mathrm{S}_{2} \mathrm{O}_{4}^{2-}$ and $\mathrm{S}_{2} \mathrm{O}_{6}^{2-}$ increases in the orders :$\mathrm{S}_{2} \mathrm{O}_{6}^{2-}\mathrm{S}_{2} \mathrm{O}_{4}^{2-}\mathrm{SO}_{3}^{2-}$$\mathrm{SO}_{3}^{2-}\mathrm{S}_{2} \mathrm{O}_{4}^{2-}\mathrm{S}_{2} \mathrm{O}_{6}^{2-}$$\mathrm{S}_{2} \mathrm{O}_{4}^{2-}\mathrm{SO}_{3}^{2-}\mathrm{S}_{2} \mathrm{O}_{6}^{2-}$$\mathrm{S}_{2} \mathrm{O}_{4}^{2-}\mathrm{S}_{2} \mathrm{O...
Read More →Which of the following series correctly represents relations between
Question: Which of the following series correctly represents relations between the elements from $\mathrm{X}$ to $\mathrm{Y}$ ? $\mathrm{X} \rightarrow \mathrm{Y}$ ${ }_{18} \mathrm{Ar} \rightarrow{ }_{54} \mathrm{Xe}$ Noble character increases${ }_{3} \mathrm{Li} \rightarrow{ }_{19} \mathrm{~K}$ Ionization enthalpy increases${ }_{6} \mathrm{C} \rightarrow{ }_{32} \mathrm{Ge}$ Atomic radii increases${ }_{9} \mathrm{~F} \rightarrow{ }_{35} \mathrm{Br}$ Electron gain enthalpy with negative sign in...
Read More →Which of the following compounds has a P-P bond :-
Question: Which of the following compounds has a P-P bond :-$\mathrm{H}_{4} \mathrm{P}_{2} \mathrm{O}_{5}$$\left(\mathrm{HPO}_{3}\right)_{3}$$\mathrm{H}_{4} \mathrm{P}_{2} \mathrm{O}_{7}$$\mathrm{H}_{4} \mathrm{P}_{2} \mathrm{O}_{6}$Correct Option: , 4 Solution:...
Read More →Trigonal bipyramidal geometry is shown by:
Question: Trigonal bipyramidal geometry is shown by:$\mathrm{XeO}_{3} \mathrm{~F}_{2}$$\mathrm{XeOF}_{2}$$\left[\mathrm{XeF}_{\mathrm{g}}\right]^{2-}$$\mathrm{FXeOSO}_{2} \mathrm{~F}$Correct Option: 1 Solution: Solution not required...
Read More →Example of a three-dimensional silicate is :
Question: Example of a three-dimensional silicate is :BerylsZeolitesFeldsparsUltramarinesCorrect Option: 1 Solution:...
Read More →The formation of molecular
Question: The formation of molecular complex $\mathrm{BF}_{3}-\mathrm{NH}_{3}$ results in a change in hybridisation of boronfrom $s p^{3}$ to $s p^{3} d$from $s p^{2}$ to $d s p^{2}$from $s p^{3}$ to $s p^{2}$from $\mathrm{sp}^{2}$ to $\mathrm{sp}^{3}$Correct Option: , 4 Solution:...
Read More →Example of a three-dimensional silicate is :
Question: Example of a three-dimensional silicate is :BerylsZeolitesFeldsparsUltramarinesCorrect Option: Solution:...
Read More →Which one of the following reactions of Xenon compounds is not feasible ?
Question: Which one of the following reactions of Xenon compounds is not feasible ? $2 \mathrm{XeF}_{2}+2 \mathrm{H}_{2} \mathrm{O} \rightarrow 2 \mathrm{Xe}+4 \mathrm{HF}+\mathrm{O}_{2}$$\mathrm{XeF}_{6}+\mathrm{RbF} \rightarrow \mathrm{Rb}\left[\mathrm{XeF}_{7}\right]$$\mathrm{XeO}_{3}+6 \mathrm{HF} \rightarrow \mathrm{XeF}_{6}+3 \mathrm{H}_{2} \mathrm{O}$$3 \mathrm{XeF}_{4}+6 \mathrm{H}_{2} \mathrm{O} \rightarrow 2 \mathrm{Xe}+\mathrm{XeO}_{3}+12 \mathrm{HF}+1.5 \mathrm{O}_{2}$Correct Option:...
Read More →Which one of the following depletes ozone layer ?
Question: Which one of the following depletes ozone layer ?NO and freons$\mathrm{SO}_{2}$$\mathrm{CO}$$\mathrm{CO}_{2}$Correct Option: 1 Solution: Solution not required...
Read More →The group having isoelectronic species is :-
Question: The group having isoelectronic species is :-$\mathrm{O}^{2-}, \mathrm{F}^{-}, \mathrm{Na}^{+}, \mathrm{Mg}^{2+}$$\mathrm{O}^{-}, \mathrm{F}^{-}, \mathrm{Na}, \mathrm{Mg}^{+}$$\mathrm{O}^{2-}, \mathrm{F}^{-}, \mathrm{Na}, \mathrm{Mg}^{2+}$$\mathrm{O}^{-}, \mathrm{F}^{-}, \mathrm{Na}^{+}, \mathrm{Mg}^{2+}$Correct Option: 1 Solution:...
Read More →Which of the following atoms has the highest first ionization energy ?
Question: Which of the following atoms has the highest first ionization energy ?$\mathrm{Sc}$$\mathrm{Rb}$$\mathrm{Na}$$\mathrm{K}$Correct Option: 1 Solution:...
Read More →Which of the following series correctly represents relations between the elements from
Question: Which of the following series correctly represents relations between the elements from $X$ to $\mathrm{Y} ?$ $\mathrm{X} \longrightarrow \mathrm{Y}$ ${ }_{18} \mathrm{Ar} \rightarrow{ }_{54} \mathrm{Xe} \quad$ Noble character increases${ }_{3} \mathrm{Li} \rightarrow{ }_{19} \mathrm{~K} \quad$ Ionization enthalpy increases${ }_{6} \mathrm{C} \rightarrow{ }_{32} \mathrm{Ge} \quad$ Atomic radii increases${ }_{9} \mathrm{~F} \rightarrow{ }_{35} \mathrm{Br}$ Electron gain enthalpy with neg...
Read More →Which type of 'defect' has the presence of cations in the
Question: Which type of 'defect' has the presence of cations in the interstitial sites ?Vacancy defectFrenkel defectMetal deficiency defectSchottky defectCorrect Option: , 2 Solution: In Frenkel defect, some of ion (usually cation due to their small size) missing from their correct position and occupies position in interstitial....
Read More →A metal crystallises in a face centred cubic structure.
Question: A metal crystallises in a face centred cubic structure. If the edge length of its unit cell is 'a', the closest approach between two atoms in metallic crystal will be :-2a$2 \sqrt{2} a$$\sqrt{2} a$$\frac{a}{\sqrt{2}}$Correct Option: , 4 Solution:...
Read More →CsCl crystallises in body centred cubic lattice. if 'a' is its edge
Question: CsCl crystallises in body centred cubic lattice. if 'a' is its edge length then which of the following expression is correct :$\mathrm{r}_{\mathrm{Cs}^{+}}+\mathrm{r}_{\mathrm{Cl}^{-}}=\frac{\sqrt{3}}{2} \mathrm{a}$$\mathrm{r}_{\mathrm{cs}^{+}}+\mathrm{r}_{\mathrm{Cl}^{-}}=\sqrt{3 \mathrm{a}}$$\mathrm{r}_{\mathrm{Cs}^{+}}+\mathrm{r}_{\mathrm{Cl}^{-}}=3 \mathrm{a}$$\mathrm{r}_{\mathrm{Cs}^{+}}+\mathrm{r}_{\mathrm{Cl}^{-}}=\frac{3 \mathrm{a}}{2}$Correct Option: 1 Solution:...
Read More →Which is the correct order of second ionization potential
Question: Which is the correct order of second ionization potential of $\mathrm{C}, \mathrm{N}, \mathrm{O}$ and $\mathrm{F}$ in the following?$\mathrm{O}\mathrm{F}\mathrm{N}\mathrm{C}$$\mathrm{O}\mathrm{N}\mathrm{F}\mathrm{C}$$\mathrm{C}\mathrm{N}\mathrm{O}\mathrm{F}$$\mathrm{F}\mathrm{O}\mathrm{N}\mathrm{C}$Correct Option: 1 Solution: Solution Not Required...
Read More →The order of increasing sizes of atomic radii among the elements
Question: The order of increasing sizes of atomic radii among the elements $\mathrm{O}, \mathrm{S}, \mathrm{Se}$ and $\mathrm{As}$ is ?As $\mathrm{S}\mathrm{O}\mathrm{Se}$$\mathrm{O}\mathrm{S}\mathrm{As}\mathrm{Se}$$\mathrm{Se}\mathrm{S}\mathrm{As}\mathrm{O}$$\mathrm{O}\mathrm{S}\mathrm{Se}\mathrm{As}$Correct Option: , 4 Solution: Solution Not Required...
Read More →The appearance of colour in solid alkali metal halides is
Question: The appearance of colour in solid alkali metal halides is generally due to :Frenkel defectF-centresSchottky defectInterstitial positionCorrect Option: , 2 Solution: Theory based...
Read More →In a monoclinic unit cell, the relation of sides
Question: In a monoclinic unit cell, the relation of sides and angles are respectively$a \neq b \neq c$ and $\alpha \neq \beta \neq \gamma \neq 90^{\circ}$$\mathrm{a} \neq \mathrm{b} \neq \mathrm{c}$ and $\beta=\gamma=90^{\circ} \neq \alpha$$\mathrm{a}=\mathrm{b} \neq \mathrm{c}$ and $\alpha=\beta=\gamma=90^{\circ}$$a \neq b \neq c$ and $\alpha=\beta=\gamma=90^{\circ}$Correct Option: , 2 Solution: Theory based...
Read More →Electron gain enthalpy with negative sign of fluorine is less than that of chlorine due to:
Question: Electron gain enthalpy with negative sign of fluorine is less than that of chlorine due to:Smaller size of chlorine atomBigger size of $2 p$ orbital of fluorineHigh ionization enthalpy ol fluorineSmaller size of fluorine atomCorrect Option: , 4 Solution: Solution Not Required...
Read More →The first ionisation potential of
Question: The first ionisation potential of $\mathrm{Na}$ is $5.1 \mathrm{eV}$. The value of electron gain enthalpy of $\mathrm{Na}^{+}$will be?$-2.55 \mathrm{eV}$$-5.1 \mathrm{eV}$$-10.2 \mathrm{eV}$$+2.55 \mathrm{eV}$Correct Option: , 4 Solution: Solution Not Required...
Read More →The total number of octahedral void(s) per atom present in a cubic
Question: The total number of octahedral void(s) per atom present in a cubic close packed structure is :-1234Correct Option: , 2 Solution: Theory based...
Read More →The concentration of fluoride, lead, nitrate and iron in a water sample from an underground lake was found to be 1000 ppb,
Question: The concentration of fluoride, lead, nitrate and iron in a water sample from an underground lake was found to be 1000 ppb, 40 ppb, 100 ppm and 0.2 ppm, respectively. This water is unsuitable for drinking due to high concentration of :-IronFluorideLeadNitrateCorrect Option: , 4 Solution:...
Read More →A water sample has ppm level concentration of following anions
Question: A water sample has ppm level concentration of following anions $\mathrm{F}^{-}=10 ; \mathrm{SO}_{4}^{2-}=100 ; \quad \mathrm{NO}_{3}^{-}=50$ the anion/anions that make / makes the water sample unsuitable for drinking is / are :only $\mathrm{NO}_{3}^{-}$both $\mathrm{SO}_{4}^{2-}$ and $\mathrm{NO}_{3}^{-}$only $\mathrm{F}^{-}$only $\mathrm{SO}_{4}^{2-}$Correct Option: , 3 Solution:...
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