The numbers of CI = O bonds in perehloric acid is,

Question: The number of $\mathrm{CI}=\mathrm{O}$ bonds in perchloric acid is, "_______". Solution: Official Ans. by NTA (3.00)...

Consider the complex ions,

Question: Consider the complex ions, $\operatorname{trans}-\left[\mathrm{Co}(\mathrm{en})_{2} \mathrm{Cl}_{2}\right]^{+}(\mathrm{A})$ and cis- $\left[\mathrm{Co}(\mathrm{en})_{2} \mathrm{Cl}_{2}\right]^{+}(\mathrm{B})$. The correct statement regarding them is : both (A) and (B) can be optically activeboth (A) and (B) cannot be optically active(A) can be optically active, but (B) cannot be optically active(A) cannot be optically active, but (B) can be optically activeCorrect Option: 4, Solution: ...

A spherical balloon of radius

Question: A spherical balloon of radius $3 \mathrm{~cm}$ containing helium gas has a pressure of $48 \times 10^{-3}$ bar. At the same temperature, the pressure, of a spherical balloon of radius $12 \mathrm{~cm}$ containing the same amount of gas will be______ $\quad \times 10^{-6}$ bar. Solution: Official Ans. by NTA (750.00)...

The elevation of boiling point of 0.10m aqueous

Question: The elevation of boiling point of $0.10 \mathrm{~m}$ aqueous $\mathrm{CrCl}_{3} \cdot \mathrm{xNH}_{3}$ solution is two times that of $0.05 \mathrm{~m}$ aqueous $\mathrm{CaCl}_{2}$ solution. The value of $x$ is [Assume $100 \%$ ionisation of the complex and $\mathrm{CaCl}_{2}$, coordination number of $\mathrm{Cr}$ as 6 , and that all $\mathrm{NH}_{3}$ molecules are present inside the coordination sphere] Solution: Official Ans. by NTA (5.00)...

The correct order of the ionic radii of

Question: The correct order of the ionic radii of $\mathrm{O}^{2-}, \mathrm{N}^{3-}, \mathrm{F}^{-}, \mathrm{Mg}^{2+}, \mathrm{Na}^{+}$and $\mathrm{Al}^{3+}$ is : $\mathrm{Al}^{3+}\mathrm{Na}^{+}\mathrm{Mg}^{2+}\mathrm{O}^{2-}\mathrm{F}^{-}\mathrm{N}^{3-}$$\mathrm{N}^{3-}\mathrm{O}^{2-}\mathrm{F}^{-}\mathrm{Na}^{+}\mathrm{Mg}^{2+}\mathrm{Al}^{3+}$$\mathrm{Al}^{3+}\mathrm{Mg}^{2+}\mathrm{Na}^{+}\mathrm{F}^{-}\mathrm{O}^{2-}\mathrm{N}^{3-}$$\mathrm{N}^{3-}\mathrm{F}^{-}\mathrm{O}^{2-}\mathrm{Mg}^{...

In an estimation of bromine by Carius method,

Question: In an estimation of bromine by Carius method, $1.6 \mathrm{~g}$ of an organic compound gave $1.88 \mathrm{~g}$ of $\mathrm{AgBr}$. The mass percentage of bromine in the compound is_______. (Atomic mass, $\mathrm{Ag}=108, \mathrm{Br}=80 \mathrm{~g} \mathrm{~mol}^{-1}$ ) Solution: Official Ans. by NTA (50.00)...

Reaction of ammonia with excess

Question: Reaction of ammonia with excess $\mathrm{Cl}_{2}$ gives : $\mathrm{NH}_{4} \mathrm{Cl}$ and $\mathrm{N}_{2}$$\mathrm{NCl}_{3}$ and $\mathrm{NH}_{4} \mathrm{Cl}$$\mathrm{NH}_{4} \mathrm{Cl}$ and $\mathrm{HCl}$$\mathrm{NCl}_{3}$ and $\mathrm{HCl}$Correct Option: , 4 Solution: $\mathrm{NH}_{3}+\underset{\text { excess }}{3 \mathrm{Cl}_{2}} \longrightarrow \mathrm{NCl}_{3}+3 \mathrm{HCl}$...

Which of the following compound shows geometrical isomerism

Question: Which of the following compound shows geometrical isomerism2 -methylpent-2-ene4-methylpent-l-ene4-methylpent-2-ene2 -methylpent-l-eneCorrect Option: , 3 Solution: (3) 4-methylpent-2-ene...

Lattice enthalpy and enthalpy of solution of

Question: Lattice enthalpy and enthalpy of solution of $\mathrm{NaCl}$ are $788 \mathrm{~kJ} \mathrm{~mol}^{-1}$ and $4 \mathrm{~kJ} \mathrm{~mol}^{-1}$, respectively. The hydration enthalpy of $\mathrm{NaCl}$ is : $-780 \mathrm{~kJ} \mathrm{~mol}^{-1}$$-784 \mathrm{~kJ} \mathrm{~mol}^{-1}$$780 \mathrm{~kJ} \mathrm{~mol}^{-1}$$784 \mathrm{~kJ} \mathrm{~mol}^{-1}$Correct Option: , 2 Solution: $4=788+\Delta \mathrm{H}$ $\Delta \mathrm{H}=-784 \mathrm{~kJ}$...

Consider the following reactions :

Question: Consider the following reactions : $\mathrm{A} \rightarrow \mathrm{P} 1 ; \mathrm{B} \rightarrow \mathrm{P} 2 ; \mathrm{C} \rightarrow \mathrm{P} 3 ; \mathrm{D} \rightarrow \mathrm{P} 4$ The order of the above reactions are $a, b, c$, and d, respectively. The following graph is obtained when $\log$ [rate] vs. $\log [$ conc $]$ are plotted: Among the following, the correct sequence for the order of the reactions is:$\mathrm{a}\mathrm{b}\mathrm{c}\mathrm{d}$$\mathrm{c}\mathrm{a}\mathrm{b...

The variation of equilibrium constant with temperature is given below :

Question: The variation of equilibrium constant with temperature is given below : The values of $\Delta \mathrm{H}^{\circ}, \Delta \mathrm{G}^{\circ}$ at $\mathrm{T}_{1}$ and $\Delta \mathrm{G}^{\circ}$ at $\mathrm{T}_{2}$ (in $\mathrm{kJ} \mathrm{mol}^{-1}$ ) respectively, are close to $\left[\right.$ Use $\left.\mathrm{R}=8.314 \mathrm{JK}^{-1} \mathrm{~mol}^{-1}\right]$$0.64,-5.71$ and $-14.29$$28.4,-7.14$ and $-5.71$$28.4,-5.71$ and $-14.29$$0.64,-7.14$ and $-5.71$Correct Option: , 3 Solutio...

Boron and silicon of very high purity can be obtained through :

Question: Boron and silicon of very high purity can be obtained through : vapour phase refiningelectrolytic refiningliquationzone refiningCorrect Option: , 4 Solution: "Boron" and "Silicon" of very high purity can be obtained through :- zone refining method only. While other methods are used for other metals/ elements i.e. (i) Vapour phase refining (ii) electrolytic refining (iii) liquation etc....

The major product of the following reaction is

Question: The major product of the following reaction is Correct Option: , 2 Solution:...

Hydrogen peroxide, in the pure state, is :

Question: Hydrogen peroxide, in the pure state, is :non-planar and almost colorlesslinear and almost colorlessplanar and blue in colorlinear and blue in colorCorrect Option: 1 Solution: hydrogen peroxide, in the pure state, is nonplanar and almost colourless (very pale blue) liquid....

Among the sulphates of alkaline earth metals,

Question: Among the sulphates of alkaline earth metals, the solubilities of $\mathrm{BeSO}_{4}$ and $\mathrm{MgSO}_{4}$ in water, respectively, are:high and highpoor and poorhigh and poorpoor and highCorrect Option: 1 Solution: (1) high and high...

The final major product of the following reaction is :

Question: The final major product of the following reaction is : Correct Option: 1 Solution:...

Which one of the following polymers is not obtained by condensation polymerisation?

Question: Which one of the following polymers is not obtained by condensation polymerisation? Buna - $N$BakeliteNylon 6Nylon 6,6Correct Option: 1, Solution:...

The increasing order of pKb values of the following compounds is -

Question: The increasing order of $\mathrm{pK}_{\mathrm{b}}$ values of the following compounds is - $II II VI I I$II $\mathrm{IV}\mathrm{III}\mathrm{I}$II $II I II V$$\mathrm{I}\mathrm{II}\mathrm{III}\mathrm{IV}$Correct Option: 1 Solution: (1) $II II VI I I$...

Among the following compounds, geometrical isomerism is exhibited by :

Question: Among the following compounds, geometrical isomerism is exhibited by : Correct Option: , 2 Solution:...

Consider the following reactions :

Question: Consider the following reactions : 'A' is - Correct Option: , 2 Solution: (2)...

The presence of soluble fluoride ion upto

Question: The presence of soluble fluoride ion upto $1 \mathrm{ppm}$ concentration in drinking water, is :harmful to bonesharmful for teethsafe for teethharmful to skinCorrect Option: , 3 Solution: (3) safe for teeth...

Question: The compound that has the largest $\mathrm{H}-\mathrm{M}-\mathrm{H}$ bond angle $(M=N, O, S, C)$, is : $\mathrm{H}_{2} \mathrm{O}$$\mathrm{CH}_{4}$$\mathrm{NH}_{3}$$\mathrm{H}_{2} \mathrm{~S}$Correct Option: , 2 Solution:...

Arrange the following solutions is the decreasing order

Question: Arrange the following solutions is the decreasing order of $\mathrm{pOH}$ : (A) $0.01 \mathrm{M} \mathrm{HC} 1$ (B) $0.01 \mathrm{M} \mathrm{NaOH}$ (C) $0.01 \mathrm{M} \mathrm{CH}_{3} \mathrm{COONa}$ (D) $0.01 \mathrm{M} \mathrm{NaCl}$$(\mathrm{B})(\mathrm{C})(\mathrm{D})(\mathrm{A})$$(\mathrm{A})(\mathrm{C})(\mathrm{D})(\mathrm{B})$(B) $(\mathrm{D})(\mathrm{C})(\mathrm{A})$$(\mathrm{A})(\mathrm{D})(\mathrm{Q}(\mathrm{B})$Correct Option: , 4 Solution: (4) $(\mathrm{A})(\mathrm{D})(\ma...

For the reaction :

Question: For the reaction : $\mathrm{Fe}_{2} \mathrm{~N}(\mathrm{~s})+\frac{3}{2} \mathrm{H}_{2}(\mathrm{~g}) \rightleftharpoons 2 \mathrm{Fe}(\mathrm{s})+\mathrm{NH}_{3}(\mathrm{~g})$$K_{C}=K_{P}(R T)$$\mathrm{K}_{\mathrm{C}}=\mathrm{K}_{\mathrm{p}}(\mathrm{RT})^{-1 / 2}$$\mathrm{K}_{\mathrm{C}}=\mathrm{K}_{\mathrm{p}}(\mathrm{RT})^{-3 / 2}$$\mathrm{K}_{\mathrm{C}}=\mathrm{K}_{\mathrm{p}}(\mathrm{RT})^{1 / 2}$Correct Option: , 4 Solution: (4) $\mathrm{K}_{\mathrm{C}}=\mathrm{K}_{\mathrm{p}}(\m...

The major product obtained from the following reaction is -

Question: The major product obtained from the following reaction is - Correct Option: , 3 Solution: (3)...