Volume ratio of decimolar $\mathrm { NH } _ { 4 } \mathrm { OH }$ and decimolar HCl to give a solution of $\mathbf { p H } = \mathbf { 9 . 2 5 }$ at $\mathbf { 2 5 } { } ^ { \circ } \mathbf { C } $ is $\mathbf { x } \boldsymbol { : } \mathbf { 1 }$. Find $\mathbf { x } \boldsymbol { . } \boldsymbol { \rightarrow }$ (2) $\mathbf { p K } _ { \mathbf { b } }$ of $\mathbf { N H } _ { \mathbf { 4 } } \mathbf { O H } = \mathbf { 4 . 7 5 }$

Which of the following is the correct order of first ionization enthalpy for Ai, Si, P, S, Cl.\ (A) Af $<$ Si $<$ P $<$ S $<$ Cl\ (B) Cl $<$ S $<$ P $<$ Si $<$ Ai\ (C) Al $<$ Si $<$ S $<$ P $<$ Cl\ (D) Si $<$ Ai $<$ S $<$ P $<$ Cl

An ideal solution is formed by mixing 3 mole of A and 1 mole of B and the vapour pressure of solution is found to be 500 mm Hg . After further addition of 1 mole A, pressure of solution becomes 520 mm Hg. Find $\mathrm { P } _ { \mathrm { A } } ^ { \circ }$.

Decreasing order of stability

Statement I
conformer is more stable than
Statement
has less steric strain than

Select correct reaction (A) [reaction shown in image] (B) [reaction shown in image] (C) [reaction shown in image] (D) $\mathrm { Ph } - \mathrm { CN } \xrightarrow [ \mathrm { Na } + \mathrm { EtOh } ] { } \mathrm { Ph } - \mathrm { NH } _ { 2 } \not +$

Consider a reaction $\mathrm { A } \rightleftharpoons \mathrm { B }$ ．At＇T＇ K ，the equilibrium concentration of A and B are $\mathbf { 0 . 3 ~ M }$ and $\mathbf { 0 . 3 1 5 ~ M }$ ．Now， $\mathbf { 0 . 1 ~ m o l }$ of A is added to the flask of 1L，then equilibrium constant and equilibrium concentration of B are （A） $1.05,0.35 \mathrm { M }$ （B） $0.95,0.37 \mathrm { M }$ （C） $1.05,0.37 \mathrm { M }$ （D） $0.95,0.35 \mathrm { M }$

Which logic gate is given in the figure?
(A) XOR (B) NOR (C) NAND (D) OR

Statement-I : Sucrose is dextrorotary and upon hydrolysis it becomes laevorotatory.
Statement-II : Sucrose on hydrolysis gives glucose and fructose such that the levorotation of glucose is more thandextrorotation of fructose.
(A) Both Statement-I and Statement-II are correct
(B) Both Statement-I and Statement-II are incorrect
(C) Statement-I is correct, Statement-II is incorrect
(D) Statement-II is correct, Statement-I is incorrect

Which of following is basic buffer? (A) $\mathrm { NaOH } + \mathrm { CH } _ { 3 } \mathrm { COONa }$ (B) $\mathrm { NaOH } + \mathrm { Na } _ { 2 } \mathrm { SO } _ { 4 }$ (C) $\mathrm { K } _ { 2 } \mathrm { SO } _ { 4 } + \mathrm { H } _ { 2 } \mathrm { SO } _ { 4 }$ (D) $\mathrm { NH } _ { 4 } \mathrm { OH } + \mathrm { NH } _ { 4 } \mathrm { Cl }$

Correct order of +3 ionic radices among B, Ai, Ga, In, Tl.\ (A) $\mathrm { B } ^ { 3 + } < \mathrm { A } \mathrm { A } ^ { 3 + } < \mathrm { Ga } ^ { 3 + } < \mathrm { In } ^ { 3 + } < \mathrm { Tl } ^ { 3 + }$\ (B) $\mathrm { B } ^ { 3 + } < \mathrm { A } ^ { 13 + } < \mathrm { Ga } ^ { 3 + } < \mathrm { Tl } ^ { 3 + } < \mathrm { In } ^ { 3 + }$\ (C) $\mathrm { B } ^ { 3 + } < \mathrm { Ga } ^ { 3 + } < \mathrm { Ai } ^ { 3 + } < \mathrm { Tl } ^ { 3 + } < \mathrm { In } ^ { 3 + }$\ (D) $\mathrm { Ai } ^ { 3 + } < \mathrm { B } ^ { 3 + } < \mathrm { Ga } ^ { 3 + } < \mathrm { In } ^ { 3 + } < \mathrm { Tl } ^ { 3 + }$

Electronegativity difference between a group 15 element \& P is less than electronegativity difference between another group 15 element \& P. Those group 15 elements respectively are- (A) Bi, N (B) $\mathrm { Sb } , \mathrm { As }$ (C) $\mathrm { Sb } , \mathrm { Bi }$ (D) N, As

Write decreasing stability order of following carbanion

Statement I: By using two different aldehyde four different product are formed by self and cross aldol condensation Statement II: alkyl cyanide after hydrolysis produced product react? with ammonia after heating formed product react with KOBr produced product $\mathbf { P }$ which on further reaction with chloroform in presence of KOH produce product RNC. G. $\overline { \mathrm { T } }$

Select the correct statement (P) I, II and III give 2, 4 - DNP (Q) II and III give PPT with NaHSO3 (R) Only III give silver mirror test (S) Only II give +ve Halo form test

The sum of valence electron in element with most and least metallic character among the following is ： $\left. \frac { \mathrm { Na } ( \mathrm { P } , \mathrm { Cl } , \mathrm { S } , \mathrm { O } ) \text { and } ( \mathrm { F } ) } { \backslash \mid E \uparrow M \cdot C \downarrow } 7 \right\rvert \, E \int _ { - } ^ { ( 8 ) } e ^ { - }$donation $\uparrow$ metallic ch $\uparrow$

Arrange the given metal ions in number in increasing order of unpaired electrons in low spin eomplex formed by $\mathbf { M n } ^ { \mathbf { 3 } \boldsymbol { + } } , \mathbf { C r } ^ { \mathbf { 3 } \boldsymbol { + } } , \mathrm { Fe } ^ { \mathbf { 3 } \boldsymbol { + } }$, $\mathrm { Co } ^ { 3 + }$
(A) $\mathbf { C o } ^ { \mathbf { 3 + } } < \mathbf { F e } ^ { \mathbf { 3 + } } < \mathbf { M n } ^ { \mathbf { 3 + } } < \mathbf { C r } ^ { \mathbf { 3 + } }$
(B) $\overline { \mathrm { Co } } ^ { 3 + } < \mathrm { Mn } ^ { 3 + } < \mathrm { Fe } ^ { 3 + } < \mathrm { Cr } ^ { 3 + }$
(C) $\mathbf { Q r } ^ { \boldsymbol { \beta } + } < \mathbf { M n } ^ { \mathbf { 3 } + } < \mathrm { Cr } ^ { \mathbf { 3 } + } < \mathrm { Fe } ^ { \mathbf { 3 } + }$
(D) $\rho \mathfrak { t } ^ { 3 + } < \mathrm { Mn } ^ { 3 + } < \mathrm { Co } ^ { 3 + } < \mathrm { Fe } ^ { 3 + }$

The correct order of electron gain enthalpy (magnitude only) for group 16 elements is (A) $\mathrm { Te } > \mathrm { Se } > \mathrm { S } > \mathrm { O }$ (B) $\mathrm { S } > \mathrm { Se } > \mathrm { Te } > \mathrm { O }$ (C) $\mathrm { O } > \mathrm { S } > \mathrm { Se } > \mathrm { Te }$ (D) $\mathrm { S } > \mathrm { O } > \mathrm { Se } > \mathrm { Te }$

Given below are two statements\
Statement-I: $\left[ \mathrm { CoBr } _ { 4 } \right] ^ { 2 - }$ absorbs lesser energy than $\left[ \mathrm { CoCl } _ { 4 } \right] ^ { 2 - }$\ Statement -II: $\left[ \mathrm { CoCl } _ { 4 } \right] ^ { 2 - }$ has higher crystal field splitting energy then $[ \mathrm { CoBr } ] ^ { 2 - }$\ (A) Both Statement-I and Statement -II are correct\ (B) Both Statement-I and Statement-II are incorrect\ (C) Statement-I is correct and Statement-II are incorrect\ (D) Statement-I is incorrect and Statement-II are correct

Consider the reaction, [reaction shown in image]
Choose the correct option, [options A, B, C, D shown in images]

The correct order of stability of following diazonium ions is
a.
b.
$c ^ { + }$
c.
d.

Order of wavelength of absorbed radiation for the below given complexes is,
(a) $\left[ \mathrm { Co } \left( \mathrm { NH } _ { 3 } \right) _ { 6 } \right] ^ { 3 + }$ (2)
(b) $\left[ \mathrm { Co } \left( \mathrm { NH } _ { 3 } \right) _ { 5 } \mathrm { H } _ { 2 } \mathrm { O } \right] ^ { 3 + }$ (3)
(c) $\left[ \mathrm { CoF } _ { 6 } \right] ^ { 3 - } \Delta \min \rightarrow$ (4)
(d) $\left[ \mathrm { Co } ( \widetilde { \mathrm { CN } } ) _ { 6 } \right] ^ { 3 - }$ (1) $( \mathrm { A } ) \mathrm { d } > \mathrm { a } > \mathrm { c } > \mathrm { b }$
(B) $\mathbf { d } > \mathbf { a } > \mathbf { b } > \mathbf { c }$
(C) $\mathbf { d } < \mathbf { a } < \mathbf { b } < \mathbf { c }$
(D) $\mathbf { d } < \mathbf { a } < \mathbf { c } < \mathbf { b }$

In Carius method of estimation of ' $\mathbf { B r }$ ', $\mathbf { 1 . 5 3 ~ g }$ of an organic compound gave 1 g AgBr. The \% of Br in organic compound is, (Atomic mass of $\mathrm { Ag } , \mathrm { Br } = 108,80$ u respectively) (A) 43.53 (B) 27.81 (C) 35.23 (D) 22.71

Match the isostructural species

	Column-I		Column-II
(a)	$\mathrm { XeO } _ { 3 } 3 + 1$	(p)	$\mathrm { ZrF } _ { 5 }$
(b)	$\mathrm { XeF } _ { 2 } 2 + 3$	(q)	$\mathrm { NH } _ { 3 }$
(c)	$\mathrm { XeO } _ { 2 } \mathrm {~F} _ { 2 }$	(r)	${ } _ { 3 + 1 } \mathrm { I } _ { 3 }$
(d)	$\mathrm { XeOF } _ { 4 }$	(s)	${ } _ { 4 + 1 } \mathrm { SF } _ { 4 }$

A capacitor of capacitance $\mathbf{C}$ having vacuum if dielectric of width $\mathbf{d/3}$ is inserted in between of dielectric constant k.
Find new capacitance of capacitor
(A) $\frac{3\mathrm{kC}}{\mathrm{k} + 1}$ (B) $\frac{\mathrm{kC}}{2\mathrm{k} + 1}$ (C) $\frac{3\mathrm{kC}}{2k}$ (D) $\frac{3\mathrm{kC}}{2\mathrm{k} + 1}$