An example of a disproportionation reaction is:
Question: An example of a disproportionation reaction is:$2 \mathrm{KMnO}_{4} \rightarrow \mathrm{K}_{2} \mathrm{MnO}_{4}+\mathrm{MnO}_{2}+\mathrm{O}_{2}$$2 \mathrm{MnO}_{4}^{-}+10 \mathrm{I}^{-}+16 \mathrm{H}^{+} \rightarrow 2 \mathrm{Mn}^{2+}+5 \mathrm{I}_{2}+8 \mathrm{H}_{2} \mathrm{O}$$2 \mathrm{CuBr} \rightarrow \mathrm{CuBr}_{2}+\mathrm{Cu}$$2 \mathrm{NaBr}+\mathrm{Cl}_{2} \rightarrow 2 \mathrm{NaCl}+\mathrm{Br}_{2}$Correct Option: , 3 Solution:...
Read More →The correct statement is :
Question: The correct statement is : zincite is a carbonate oreaniline is a froth stabilizerzone refining process is used for the refining of titaniumsodium cyanide cannot be used in the metallurgy of silverCorrect Option: , 2 Solution: (1) Zincite is $\mathrm{ZnO}$ (2) Aniline is the forth stablizer. (3) Zone refining process is not used for refining of 'Ti' (4) Sodium cyanide is used in the metallurgy of silver...
Read More →The idea of froth floatation method came from a person
Question: The idea of froth floatation method came from a person $X$ and this method is related to the process $Y$ of ores. $X$ and $Y$, respectively, are:fisher woman and concentrationwasher man and reductionwasher woman and concentrationfisher man and reductionCorrect Option: , 3 Solution: The idea of froth floatation method came from washerwoman and this process is related to concentration of sulphide ores....
Read More →Which of the following is a thermosetting polymer?
Question: Which of the following is a thermosetting polymer?Buna-NPVCBakeliteNylon 6Correct Option: , 3 Solution: Bakelite is thermoselting polymer...
Read More →An ideal gas is allowed to expand from
Question: An ideal gas is allowed to expand from $1 \mathrm{~L}$ to $10 \mathrm{~L}$ against a constant external pressure of 1bar. The work done in $\mathrm{kJ}$ is :$-9.0$$+10.0$$-0.9$$-2.0$Correct Option: , 3 Solution:...
Read More →Which one of the following graphs between molar conductivity
Question: Which one of the following graphs between molar conductivity $\left(\Lambda_{\mathrm{m}}\right)$ versus $\sqrt{\mathrm{C}}$ is correct?Correct Option: , 2 Solution: Both $\mathrm{NaCl}$ and $\mathrm{KCl}$ are strong electrolytes and as $\mathrm{Na}^{+}$(aq.) has less conductance than $\mathrm{K}^{+}$(aq.) due to more hydration therefore the graph of option (2) is correct....
Read More →Glucose and Galactose are having identical configuration
Question: Glucose and Galactose are having identical configuration in all the positions except position.$\mathrm{C}-3$$\mathrm{C}-2$$\mathrm{C}-4$$\mathrm{C}-5$Correct Option: , 3 Solution: Glucose and galactose are C-4 Epimer's...
Read More →In the following reaction;
Question: In the following reaction; $\mathrm{xA} \rightarrow \mathrm{yB}$ $\log _{10}\left[-\frac{\mathrm{d}[\mathrm{A}]}{\mathrm{dt}}\right]=\log _{10}\left[\frac{\mathrm{d}[\mathrm{B}]}{\mathrm{dt}}\right]+0.3010$ 'A' and 'B' respectively can be :n-Butane and Iso-butane$\mathrm{C}_{2} \mathrm{H}_{4}$ and $\mathrm{C}_{4} \mathrm{H}_{8}$$\mathrm{N}_{2} \mathrm{O}_{4}$ and $\mathrm{NO}_{2}$$\mathrm{C}_{2} \mathrm{H}_{2}$ and $\mathrm{C}_{6} \mathrm{H}_{6}$Correct Option: , 2 Solution:...
Read More →Solve this following
Question: $1 \mathrm{~g}$ of non-volatile non-electrolyte solute is dissolved in $100 \mathrm{~g}$ of two different solvents $A$ and B whose ebullioscopic constants are in the ratio of $1: 5$. The ratio of the elevation in their boiling points, $\frac{\Delta \mathrm{T}_{\mathrm{b}}(\mathrm{A})}{\Delta \mathrm{T}_{\mathrm{b}}(\mathrm{B})}$, is :$5: 1$$10: 1$$1: 5$$1: 0.2$Correct Option: , 3 Solution:...
Read More →Which of the following statements is not true about RNA ?
Question: Which of the following statements is not true about RNA ?It has always double stranded $\alpha$-helix structureIt usually does not replicateIt is present in the nucleus of the cellIt controls the synthesis of proteinCorrect Option: 1 Solution: RNA is a single stranded structure....
Read More →The noble gas that does NOT occur in the atmosphere is:
Question: The noble gas that does NOT occur in the atmosphere is:$\mathrm{He}$$\mathrm{Ra}$$\mathrm{Ne}$$\mathrm{Kr}$Correct Option: , 2 Solution: In question noble gas asked, which does not exist in the atmosphere and answer is given Ra. Ra is a alkaline earth metal not noble gas it should be Rn. It is printing error in JEE Main paper...
Read More →The increasing order of the
Question: The increasing order of the $\mathrm{pK}_{\mathrm{b}}$ of the following compound is : $(\mathrm{A})(\mathrm{C})(\mathrm{D})(\mathrm{B})$$(\mathrm{B})(\mathrm{D})(\mathrm{A})(\mathrm{C})$$(\mathrm{C})(\mathrm{A})(\mathrm{D})(\mathrm{B})$$(\mathrm{B})(\mathrm{D})(\mathrm{C})(\mathrm{A})$Correct Option: , 2 Solution:...
Read More →Solve this following
Question: The $\mathrm{pH}$ of a $0.02 \mathrm{M} \mathrm{NH}$ [given $\mathrm{K}_{\mathrm{b}}\left(\mathrm{NH}_{4} \mathrm{OH}\right)=10^{-5}$ and $\log 2=0.301$ ]$4.65$$5.35$$4.35$$2.65$Correct Option: , 2 Solution:...
Read More →The major products of the following reaction are :
Question: The major products of the following reaction are : Correct Option: , 3 Solution:...
Read More →For the reaction,
Question: For the reaction, $2 \mathrm{SO}_{2}(\mathrm{~g})+\mathrm{O}_{2}(\mathrm{~g}) \rightleftharpoons 2 \mathrm{SO}_{3}(\mathrm{~g})$ $\Delta \mathrm{H}=-57.2 \mathrm{~kJ} \mathrm{~mol}^{-1}$ and $\mathrm{K}_{\mathrm{c}}=1.7 \times 10^{16}$ Which of the following statement is INCORRECT?The equilibrium constant is large suggestive of reaction going to completion and so no catalyst is required.The equilibrium will shift in forward direction as the pressure increase.The equilibrium constant de...
Read More →An element has a face-centred cubic (fcc) structure
Question: An element has a face-centred cubic (fcc) structure with a cell edge of a. The distance between the centres of two nearest tetrahedral voids in the lattice is :$\frac{a}{2}$$a$$\frac{3}{2} a$$\sqrt{2} a$Correct Option: 1 Solution: Distance between two nearest tetrahedral void $=\left(\frac{a}{2}\right)$...
Read More →The INCORRECT statement is :
Question: The INCORRECT statement is : the spin-only magnetic moments of $\left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}$ and and $\left[\mathrm{Cr}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}$ are nearly similar.the spin-only magnetic moment of $\left[\mathrm{Ni}\left(\mathrm{NH}_{3}\right)_{4}\left(\mathrm{H}_{2} \mathrm{O}\right)_{2}\right]^{2+}$ is $2.83 \mathrm{BM}$.the gemstone, ruby, has $\mathrm{Cr}^{3+}$ ions occupying the octahedral sites of beryl.the...
Read More →The major product(s) obtained
Question: The major product(s) obtained in the following reaction is/are : Correct Option: , 2 Solution:...
Read More →Points I, II and III in the following plot respectively correspond to
Question: Points I, II and III in the following plot respectively correspond to $\left(\mathrm{V}_{\mathrm{mp}}\right.$ : most probable velocity) $\mathrm{V}_{\mathrm{mp}}$ of $\mathrm{N}_{2}(300 \mathrm{~K}) ; \mathrm{V}_{\mathrm{mp}}$ of $\mathrm{H}_{2}(300 \mathrm{~K})$; $\mathrm{V}_{\mathrm{mn}}$ of $\mathrm{O}_{2}(400 \mathrm{~K})$$\mathrm{V}_{\mathrm{mp}}$ of $\mathrm{H}_{2}(300 \mathrm{~K}) ; \mathrm{V}_{\mathrm{mp}}$ of $\mathrm{N}_{2}(300 \mathrm{~K})$ $\mathrm{V}_{\mathrm{mp}}$ of $\ma...
Read More →Complete removal of both the axial ligands
Question: Complete removal of both the axial ligands (along the z-axis) from an octahedral complex leads to which of the following splitting patterns? (relative orbital energies not on scale).Correct Option: 1 Solution: If both ligands present along $z$-axis removed from octachedral field and converted into square planar field, then...
Read More →The correct option among the following is :
Question: The correct option among the following is :Colloidal particles in lyophobic sols can be precipiated by electrophoresis.Brownian motion in colloidal solution is faster the viscosity of the solution is very high.Colloidal medicines are more effective because they have small surface area.Addition of alum to water makes it unfit for drinking.Correct Option: 1 Solution: In electrophoresis precipitation occurs at the electrode which is oppositely charged therefore (1) is correct....
Read More →The group number,
Question: The group number, number of valence electrons, and valency of an element with atomic number 15 , respectively, are16,5 and 216,6 and 315,5 and 315,6 and 2Correct Option: , 3 Solution: Atomic number $(\mathrm{Z})=15 \Rightarrow \mathrm{P} \rightarrow[\mathrm{Ne}] 3 \mathrm{~s}^{2} 3 \mathrm{p}^{3}$ Phosphorus belongs to $15^{\text {th }}$ group number of valence electrons $=5$ and valency $=3$ in ground state....
Read More →The correct order of the first ionization enthalpies is:
Question: The correct order of the first ionization enthalpies is:$\mathrm{Mn}\mathrm{Ti}\mathrm{Zn}\mathrm{Ni}$$\mathrm{Ti}\mathrm{Mn}\mathrm{Ni}\mathrm{Zn}$$\mathrm{Zn}\mathrm{Ni}\mathrm{Mn}\mathrm{Ti}$$\mathrm{Ti}\mathrm{Mn}\mathrm{Zn}\mathrm{Ni}$Correct Option: , 2 Solution:...
Read More →The metal that gives hydrogen gas upon treatment
Question: The metal that gives hydrogen gas upon treatment with both acid as well as base is :zincironmagnesiummercuryCorrect Option: 1 Solution:...
Read More →Solve this following
Question: The number of pentagons in $C_{60}$ and trigons (triangles) in white phosphorus, respectively, are:12 and 320 and 412 and 420 and 3Correct Option: , 3 Solution: Total No. of pentagons in $\mathrm{C}_{60}=12$ Total no. of trigons (triangles) in white phosphorus $\left(\mathrm{P}_{4}\right)=4$...
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