The `` pH `` of the solution containing `` 50\, mL `` each of `` 0.10 \,M `` sodium acetate and `` 0.01 \,M `` acetic acid is [Given `` pK _{ a } `` of `` \left.CH _{3} COOH =4.57\right] ``
(A) `` 2.57 ``

(B) `` 5.57 ``
(C) `` 3.57 ``
(D) `` 4.57 ``

Which one is not correct mathematical equation for Dalton's Law of partial pressure ? Here `` p= `` total pressure of gaseous mixture

(A) `` p _{i}=\chi_{i} p _{i}^{0} `` , where `` \chi_{i}= `` mole fraction of `` i^{\text {th }} `` gas in gaseous mixture `` p_{i}^{0}= `` pressure of `` i^{\text {th }} `` gas in pure state
(B) `` p = p _{1}+ p _{2}+ p _{3} ``
(C) `` p = n _{1} \frac{ RT }{ V }+ n _{2} \frac{ RT }{ V }+ n _{3} \frac{ RT }{ V } ``
(D) `` p _{i}=\chi_{i} p `` , where `` p _{j}= `` partial pressure of `` i^{\text {th }} `` gas `` \chi_{i}= `` mole fraction of `` i^{\text {th }} `` gas in gaseous mixture

The incorrect statement regarding enzymes is :
(A)Enzymes are very specific for a particular reaction and substrate.
(B)Enzymes are biocatalysts.
(C)Like chemical catalysts enzymes reduce the activation energy of bio processes.

(D)Enzymes are polysaccharides.

Match List - I with List - II.

Given below are two statements: Statement I : Primary aliphatic amines react with `` HNO _{2} `` to give unstable diazonium salts. Statement II : Primary aromatic amines react with `` HNO _{2} `` to form diazonium salts which are stable even above `` 300\, K `` . In the light of the above statements, choose the most appropriate answer from the options given below :
(A)Statement I is incorrect but Statement II is correct.
(B)Both Statement I and Statement II are correct.
(C)Both Statement I and Statement II are incorrect.

(D)Statement I is correct but Statement II is incorrect.

Which of the following is suitable to synthesize chlorobenzene?
(A)

(B)Benzene, `` Cl _{2} `` , anhydrous `` FeCl _{3} ``

(C)Phenol, `` NaNO _{2}, HCl , CuCl ``
(D)

Identify the incorrect statement from the following
(A)Lithium is the strongest reducing agentamong the alkali metals.
(B)Alkali metals react with water to form their hydroxides.

(C)The oxidation number of `` K `` in `` KO _{2} `` is `` +4 `` .
(D)Ionisation enthalpy of alkali metals decreases from top to bottom in the group.

Which compound amongst the following is not an aromatic compound?

(A)

(B)

(C)

(D)

At `` 298\, K `` , the standard electrode potentials of `` Cu ^{2+} /Cu , Zn ^{2+} / Zn , Fe ^{2+} / Fe `` and `` Ag ^{+} / Ag `` are `` 0.34\, V `` , `` -0.76 \,V ,-0.44 \,V `` and `` 0.80 \,V `` , respectively. On the basis of standard electrode potential, predict which of the following reaction can not occur?

(A) `` 2 CuSO _{4}( aq )+2 Ag ( s ) \rightarrow 2 Cu ( s )+ Ag _{2} SO _{4}( aq ) ``
(B) `` CuSO _{4}( aq )+ Zn ( s ) \rightarrow ZnSO _{4}( aq )+ Cu ( s ) ``
(C) `` CuSO _{4}( aq )+ Fe ( s ) \rightarrow FeSO _{4}( aq )+ Cu ( s ) ``
(D) `` FeSO _{4}( aq )+ Zn ( s ) \rightarrow ZnSO _{4}( aq )+ Fe ( s ) ``

Given below are two statements : Statement I :The acidic strength of monosubstituted nitrophenol is higher than phenol because of electron withdrawing nitro group. Statement II : `` o `` -nitrophenol, `` m `` -nitrophenol and `` p `` -nitrophenol will have same acidic strength as they have one nitro group attached to the phenolic ring. In the light of the above statements, choose the most appropriate answer from the options given below :

(A)Statement I is incorrect but Statement II is correct.
(B)Both Statement I and Statement II are correct.
(C)Both Statement I and Statement II are incorrect.
(D)Statement I is correct but Statement II is incorrect.

Which of the following statement is not correct about diborane?

(A)Both the Boron atoms are `` s p^{2} `` hybridised.
(B)There are two 3-centre-2-electron bonds.
(C)The four terminal B-H bonds are two centre two electron bonds.
(D)The four terminal Hydrogen atoms and the two Boron atoms lie in one plane.

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : In a particular point defect, an ionic solid is electrically neutral, even if few of its cations are missing from its unit cells. Reason (R) : In an ionic solid, Frenkel defect arises due to dislocation of cation from its lattice site to interstitial site, maintaining overall electrical neutrality. In the light of the above statements, choose the most appropriate answer from the options given below :
(A)(A) is not correct but (R) is correct

(B)Both (A) and (R) are correct and (R) is the correct explanation of (A)
(C)Both (A) and (R) are correct but (R) is not the correct explanation of `` ( A ) ``
(D)(A) is correct but (R) is not correct

Given below are two statements : Statement I : The boiling points of aldehydes and ketones are higher than hydrocarbons of comparable molecular masses because of weak molecular association in aldehydes and ketones due to dipole - dipole interactions. Statement II : The boiling points of aldehydes and ketones are lower than the alcohols of similar molecular masses due to the absence of H-bonding. In the light of the above statements, choose the most appropriate answer from the options given below :
(A)Statement I is incorrect but Statement II is correct.

(B)Both Statement I and Statement II are correct.
(C)Both Statement I and Statement II are incorrect.
(D)Statement I is correct but Statement II is incorrect.

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): `` ICl `` is more reactive than `` I _{2} `` . Reason (R): `` I-Cl `` bond is weaker than `` I-I `` bond. In the light of the above statements, choose the most appropriate answer from the options given below :
(A)(A) is not correct but (R) is correct.

(B)Both (A) and (R) are correct and (R) is the correct explanation of `` ( A ) `` .
(C)Both (A) and (R) are correct but (R) is not the correct explanation of (A).
(D)(A) is correct but (R) is not correct.