The amphoteric hydroxide is :
Question: The amphoteric hydroxide is :$\mathrm{Ca}(\mathrm{OH})_{2}$$\mathrm{Be}(\mathrm{OH})_{2}$$\mathrm{Sr}(\mathrm{OH})_{2}$$\mathrm{Mg}(\mathrm{OH})_{2}$Correct Option: 2 Solution: $\mathrm{Be}(\mathrm{OH})_{2}$ is amphoteric in nature while rest all alkaline earth metal hydroxide are basic in nature....
Read More →NaH is an example of :
Question: $\mathrm{NaH}$ is an example of :Electron-rich hydrideMolecular hydrideSaline hydrideMetallic hydrideCorrect Option: , 3 Solution: $\mathrm{NaH}$ is an example of ionic hydride which is also known as saline hydride....
Read More →Peoxyacetyl nitrate (PAN),
Question: Peoxyacetyl nitrate (PAN), an eye irritant is produced by:Acid rainPhotochemical smogClassical smogOrganic wasteCorrect Option: , 2 Solution: Photochemical smog...
Read More →An example of solid sol is :
Question: An example of solid sol is : ButterGem stonesPaintHair creamCorrect Option: , 2 Solution: Gem stones...
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 →The polymer obtained from the following reactions is:
Question: The polymer obtained from the following reactions is: Correct Option: , 2 Solution:...
Read More →When the first electron gain enthalpy
Question: When the first electron gain enthalpy $\left(\Delta_{\text {eg }} \mathrm{H}\right)$ of oxygen is $-141 \mathrm{~kJ} / \mathrm{mol}$, its second electron gain enthalpy is :almost the same as that of the firstnegative, but less negative than the firsta positive valuea more negative value than the firstCorrect Option: , 3 Solution: Second electron gain enthalpy is always positive for every element. $\mathrm{O}_{(\mathrm{g})}^{-}+\mathrm{e}^{-} \rightarrow \mathrm{O}_{(\mathrm{g})}^{-2} \...
Read More →A solid having density of
Question: A solid having density of $9 \times 10^{3} \mathrm{~kg} \mathrm{~m}^{-3}$ forms face centred cubic crystals of edge length $200 \sqrt{2} \mathrm{pm}$. What is the molar mass of the solid? (Avogadro constant $\cong 6 \times 10^{23} \mathrm{~mol}^{-1}, \pi \cong 3$ )$0.0216 \mathrm{~kg} \mathrm{~mol}^{-1}$$0.0305 \mathrm{~kg} \mathrm{~mol}^{-1}$$0.4320 \mathrm{~kg} \mathrm{~mol}^{-1}$$0.0432 \mathrm{~kg} \mathrm{~mol}^{-1}$Correct Option: , 2 Solution: $0.0305 \mathrm{~kg} \mathrm{~mol}^...
Read More →The freezing point of a diluted milk sample is found
Question: The freezing point of a diluted milk sample is found to be $-0.2^{\circ} \mathrm{C}$, while it should have been $-0.5^{\circ} \mathrm{C}$ for pure milk. How much water has been added to pure milk to make the diluted sample ?2 cups of water to 3 cups of pure milk1 cup of water to 3 cups of pure milk3 cups of water to 2 cups of pure milk1 cup of water to 2 cups of pure milkCorrect Option: , 3 Solution: 3 cups of water to 2 cups of pure milk...
Read More →For the chemical reaction
Question: For the chemical reaction $\mathrm{X} \rightleftharpoons \mathrm{Y}$, the standard reaction Gibbs energy depends on temperature $\mathrm{T}$ (in $\mathrm{K}$ ) as : $\Delta_{\mathrm{r}} \mathrm{G}^{\circ}\left(\right.$ in $\left.\mathrm{kJ} \mathrm{mol}^{-1}\right)=120-\frac{3}{8} \mathrm{~T}$ The major component of the reaction mixture at $T$ is :$\mathrm{X}$ if $\mathrm{T}=315 \mathrm{~K}$$\mathrm{X}$ if $\mathrm{T}=350 \mathrm{~K}$$\mathrm{Y}$ if $\mathrm{T}=300 \mathrm{~K}$$\mathrm...
Read More →A solution containing
Question: A solution containing $62 \mathrm{~g}$ ethylene glycol in $250 \mathrm{~g}$ water is cooled to $-10^{\circ} \mathrm{C}$. If $\mathrm{K}_{\mathrm{f}}$ for water is $1.86 \mathrm{~K} \mathrm{~kg} \mathrm{~mol}^{-1}$, the amount of water (in $\mathrm{g}$ ) separated as ice is :32481664Correct Option: , 4 Solution:...
Read More →The chloride that CANNOT get hydrolysed is :
Question: The chloride that CANNOT get hydrolysed is :$\mathrm{SiCl}_{4}$$\mathrm{SnCl}_{4}$$\mathrm{PbCl}_{4}$$\mathrm{CCl}_{4}$Correct Option: , 4 Solution: $\mathrm{CCl}_{4}$ cannot get hydrolyzed due to the absence of vacant orbital at carbon atom....
Read More →If the standard electrode potential for a cell is
Question: If the standard electrode potential for a cell is $2 \mathrm{~V}$ at $300 \mathrm{~K}$, the equilibrium constant (K) for the reaction $\mathrm{Zn}(\mathrm{s})+\mathrm{Cu}^{2+}(\mathrm{aq}) \rightleftharpoons \mathrm{Zn}^{2+}(\mathrm{aq})+\mathrm{Cu}(\mathrm{s})$ at $300 \mathrm{~K}$ is approximately. $\left(\mathrm{R}=8 \mathrm{JK}^{-1} \mathrm{~mol}^{-1}, \mathrm{~F}=96000 \mathrm{C} \mathrm{mol}^{-1}\right)$$e^{160}$$e^{320}$$e^{-160}$$e^{-80}$Correct Option: 1 Solution:...
Read More →Two blocks of the same metal having same mass
Question: Two blocks of the same metal having same mass and at temperature $T_{1}$ and $T_{2}$, respectively. are brought in contact with each other and allowed to attain thermal equilibrium at constant pressure. The change in entropy, $\Delta \mathrm{S}$, for this process is :$2 \mathrm{C}_{\mathrm{P}} \ln \left(\frac{\mathrm{T}_{1}+\mathrm{T}_{2}}{4 \mathrm{~T}_{1} \mathrm{~T}_{2}}\right)$$2 \mathrm{C}_{\mathrm{P}} \ln \left[\frac{\left(\mathrm{T}_{1}+\mathrm{T}_{2}\right)^{\frac{1}{2}}}{\math...
Read More →The major product of the following reaction is :
Question: The major product of the following reaction is : Correct Option: 1 Solution:...
Read More →Solve this following
Question: The $\mathrm{pH}$ of rain water, is approximately :$6.5$$7.5$$5.6$$7.0$Correct Option: , 3 Solution: $\mathrm{pH}$ of rain water is approximate $5.6$...
Read More →A 10 mg effervescent tablet contianing sodium
Question: A $10 \mathrm{mg}$ effervescent tablet contianing sodium bicarbonate and oxalic acid releases $0.25 \mathrm{ml}$ of $\mathrm{CO}_{2}$ at $\mathrm{T}=298.15 \mathrm{~K}$ and $\mathrm{p}=1$ bar. If molar volume of $\mathrm{CO}_{2}$ is $25.0 \mathrm{~L}$ under such condition, what is the percentage of sodium bicarbonate in each tablet ? [Molar mass of $\mathrm{NaHCO}_{3}=84 \mathrm{~g} \mathrm{~mol}^{-1}$ ]$16.8$$8.4$$0.84$$33.6$Correct Option: 1 Solution: $16.8$...
Read More →Match the metals (Column I) with the coordination
Question: Match the metals (Column I) with the coordination compound(s) / enzyme(s) (Column II) A-ii ; B-i ; C-iv ; D-iiiA-iii ; B-iv ; C-i ; D-iiA-iv ; B-iii ; C-i ; D-iiA-i ; B-ii ; C-iii ; D-ivCorrect Option: , 2 Solution:...
Read More →The entropy change associated with the conversion
Question: The entropy change associated with the conversion of $1 \mathrm{~kg}$ of ice at $273 \mathrm{~K}$ to water vapours at $383 \mathrm{~K}$ is : (Specific heat of water liquid and water vapour are $4.2 \mathrm{~kJ} \mathrm{~K}^{-1} \mathrm{~kg}^{-1}$ and $2.0 \mathrm{~kJ} \mathrm{~K}^{-1} \mathrm{~kg}^{-1}$; heat of liquid fusion and vapourisation of water are $344 \mathrm{~kJ} \mathrm{~kg}^{-1}$ and $2491 \mathrm{~kJ} \mathrm{~kg}^{-1}$, respectively). $(\log 273=2.436, \log 373=2.572, \l...
Read More →The correct order of the atomic radii of
Question: The correct order of the atomic radii of $\mathrm{C}, \mathrm{Cs}, \mathrm{Al}$ and $S$ is:$\mathrm{S}\mathrm{C}\mathrm{Al}\mathrm{Cs}$$\mathrm{S}\mathrm{C}\mathrm{Cs}\mathrm{Al}$$\mathrm{C}\mathrm{S}\mathrm{Cs}\mathrm{Al}$$\mathrm{C}\mathrm{S}\mathrm{Al}\mathrm{Cs}$Correct Option: , 4 Solution: Atomic radii order : $\mathrm{C}\mathrm{S}\mathrm{Al}\mathrm{Cs}$ Atomic radius of $\mathrm{C}: 170 \mathrm{pm}$ Atomic radius of S : $180 \mathrm{pm}$ Atomic radius of $\mathrm{Al}: 184 \mathr...
Read More →The temporary hardness of water is due to :-
Question: The temporary hardness of water is due to :- $\mathrm{Ca}\left(\mathrm{HCO}_{3}\right)_{2}$$\mathrm{NaCl}$$\mathrm{Na}_{2} \mathrm{SO}_{4}$$\mathrm{CaCl}_{2}$Correct Option: 1 Solution: $\mathrm{Ca}\left(\mathrm{HCO}_{3}\right)_{2}$ is reponsible for temporary hardness of water...
Read More →Match the ores(Column A) with the metals $($ column B) :
Question: Match the ores(Column A) with the metals $($ column B) : I-b ; II-c ; III-d ; IV-aI-c ; II-d ; III-a ; IV-bI-c ; II-d ; III-b ; IV-aI-a ; II-b ; III-c ; IV-dCorrect Option: , 3 Solution:...
Read More →Consider the reaction,
Question: Consider the reaction, $\mathrm{N}_{2}(\mathrm{~g})+3 \mathrm{H}_{2}(\mathrm{~g}) \rightleftharpoons 2 \mathrm{NH}_{3}(\mathrm{~g})$ The equilibrium constant of the above reaction is $\mathrm{K}_{\mathrm{P}}$. If pure ammonia is left to dissociate, the partial pressure of ammonia at equilibrium is given by (Assume that $\mathrm{P}_{\mathrm{NH}_{3}}\mathrm{P}_{\text {total }}$ at equilibrium)Correct Option: , 2 Solution:...
Read More →Heat treatment of muscular pain involves radiation
Question: Heat treatment of muscular pain involves radiation of wavelength of about $900 \mathrm{~nm}$. Which spectral line of H-atom is suitable for this purpose ? ${\left[\mathrm{R}_{\mathrm{H}}=1 \times 10^{5} \mathrm{~cm}^{-1}, \mathrm{~h}=6.6 \times 10^{-34} \mathrm{Js}\right.}$ $\left.\mathrm{c}=3 \times 10^{8} \mathrm{~ms}^{-1}\right]$Paschen, $5 \rightarrow 3$Paschen, $\infty \rightarrow 3$Lyman, $\infty \rightarrow 1$Balmer, $\infty \rightarrow 2$Correct Option: 2, Solution: Paschen, $\...
Read More →The correct match between Item(I) and Item(II) is:
Question: The correct match between Item(I) and Item(II) is: A-R, B-P, C-SA-Q, B-P, C-R$A-R, B-P, C-R$A-Q, B-R, C-SCorrect Option: , 2 Solution:...
Read More →