E⁰ for Fe²⁺ + 2e → Fe is -0.44 volt and E⁰ for Zn²⁺ + 2e→ Zn is -0.76 volt, thus:

1. Zn is more electropositive than Fe

2. Fe is more electropositive than Zn

3. Zn is more electronegative

4. none of the above  

Fe²⁺ + 2e → Fe के लिए E⁰ -0.44 वोल्ट और Zn²⁺ + 2e→ Zn के लिए E⁰ -0.76 वोल्ट है, इसप्रकार:

(1) Z, Fe की तुलना में अधिक विद्युतधनात्मक है

(2) Fe, Zn की तुलना में अधिक विद्युतधनात्मक है

(3) Zn अधिक विद्युतऋणात्मक है

(4) उपरोक्त में से कोई नहीं

During the charging of lead storage battery, the reaction at anode is represented by:

1. ${\mathrm{Pb}}^{2+}<mspace\; width="1em"></mspace>+<mspace\; width="1em"></mspace>{\mathrm{SO}}_4^{2-}<mspace\; width="1em"></mspace>\stackrel{<mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace>}{\to }{\mathrm{PbSO}}_4$

2. ${\mathrm{PbSO}}_4<mspace\; width="1em"></mspace>+\hspace{0.17em}{\mathrm{H}}_2\mathrm{O}<mspace\; width="1em"></mspace>\stackrel{<mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace>}{\to }{\mathrm{PbO}}_2<mspace\; width="1em"></mspace>+\hspace{0.17em}{\mathrm{SO}}_4^{2-}<mspace\; width="1em"></mspace>+<mspace\; width="1em"></mspace>2{\mathrm{H}}^{+}$

3. $\mathrm{Pb}<mspace\; width="1em"></mspace>\stackrel{<mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace>}{\to }{\mathrm{Pb}}^{2+}<mspace\; width="1em"></mspace>+<mspace\; width="1em"></mspace>2\mathrm{e}$

4. ${\mathrm{Pb}}^{2+}<mspace\; width="1em"></mspace>+2\mathrm{e}<mspace\; width="1em"></mspace>\stackrel{<mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace>}{\to }\mathrm{Pb}$

लेड संचायक बैटरी आवेशित करने के दौरान, एनोड पर अभिक्रिया द्वारा दर्शाया जाता है:

(1) ${\mathrm{Pb}}^{2+}<mspace\; width="1em"></mspace>+<mspace\; width="1em"></mspace>{\mathrm{SO}}_4^{2-}<mspace\; width="1em"></mspace>\stackrel{<mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace>}{\to }{\mathrm{PbSO}}_4$

(2) ${\mathrm{PbSO}}_4<mspace\; width="1em"></mspace>+\hspace{0.17em}{\mathrm{H}}_2\mathrm{O}<mspace\; width="1em"></mspace>\stackrel{<mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace>}{\to }{\mathrm{PbO}}_2<mspace\; width="1em"></mspace>+\hspace{0.17em}{\mathrm{SO}}_4^{2-}<mspace\; width="1em"></mspace>+<mspace\; width="1em"></mspace>2{\mathrm{H}}^{+}$

(3) $\mathrm{Pb}<mspace\; width="1em"></mspace>\stackrel{<mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace>}{\to }{\mathrm{Pb}}^{2+}<mspace\; width="1em"></mspace>+<mspace\; width="1em"></mspace>2\mathrm{e}$

(4) ${\mathrm{Pb}}^{2+}<mspace\; width="1em"></mspace>+2\mathrm{e}<mspace\; width="1em"></mspace>\stackrel{<mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace>}{\to }\mathrm{Pb}$

At $25°C$, the standard emf of cell having reactions involving two electron change is found to be 0.295 V. The equilibrium constant of the reaction is-

$\left(A\right)<mspace\; width="1em"></mspace>29.5<mspace\; width="1em"></mspace>\times <mspace\; width="1em"></mspace>{10}^{-2}$

$\left(B\right)<mspace\; width="1em"></mspace>10<mspace\; width="1em"></mspace>$

$\left(C\right)<mspace\; width="1em"></mspace>{10}^{10}<mspace\; width="1em"></mspace><mspace\; width="1em"></mspace>$

$\left(D\right)<mspace\; width="1em"></mspace>29.5<mspace\; width="1em"></mspace>\times <mspace\; width="1em"></mspace>{10}^{10}$

$25°C$ पर, दो इलेक्ट्रॉन परिवर्तन युक्त सेल वाले अभिक्रियाओं का मानक emf 0.295 V पाया जाता है। अभिक्रिया का साम्यावस्था स्थिरांक है-

$\left(1\right)<mspace\; width="1em"></mspace>29.5<mspace\; width="1em"></mspace>\times <mspace\; width="1em"></mspace>{10}^{-2}$

$\left(2\right)<mspace\; width="1em"></mspace>10<mspace\; width="1em"></mspace>$

$\left(3\right)<mspace\; width="1em"></mspace>{10}^{10}<mspace\; width="1em"></mspace><mspace\; width="1em"></mspace>$

$\left(4\right)<mspace\; width="1em"></mspace>29.5<mspace\; width="1em"></mspace>\times <mspace\; width="1em"></mspace>{10}^{10}$

If the half-cell reaction A+e$\to$A^- has a large negative reduction potential, it follows that:

1. A is readily reduced

2. A is readily oxidized

3. A^- is readily reduced

4. A^- is readily oxidized

यदि अर्ध सेल अभिक्रिया A+e$\to$A^- में अधिक ऋणात्मक अपचयन विभव होता है, यह इस प्रकार है:

(1) A आसानी से अपचयित हो जाता है

(2) A आसानी से ऑक्सीकृत हो जाता है

(3) A^- आसानी से अपचयित हो जाता है

(4) A^- आसानी से ऑक्सीकृत हो जाता है

The cell reaction of micro electrochemical cell fromed during rusting of iron is:-

लोहे में जंग लगने के दौरान बनने वाली सूक्ष्म वैद्युतरासायनिक सेल की सेल अभिक्रिया है: -

When 0.1 mole of MnO^2-₄ is oxidised, the quantity of electricity required to completely oxidise MnO^2-₄ to MnO^-₄ is 

1. 96500 C

2. 2*96500 C 

3. 9650 C

4. 96.50 C

जब MnO^2-₄ का 0.1 मोल ऑक्सीकृत किया जाता है, MnO^2-₄ से MnO^-₄ को पूर्णतया ऑक्सीकृत करने के लिए आवश्यक विद्युत की मात्रा है-

(1) 96500 C

(2) 2*96500 C

(3) 9650 C

(4) 96.50 C

When a lead storage battery is discharged, then:

1. SO₂ is evolved

2. lead is formed

3. lead sulphate is consumed

4. sulphuric acid is consumed

जब एक लेड संचायक बैटरी को विसर्जित किया जाता है, तो:

(1) SO₂ उत्पन्न होती है

(2) लेड बनता है

(3) लेड सल्फेट का उपभोग किया जाता है

(4) सल्फ्यूरिक अम्ल का उपभोग किया जाता है

$E_{\raisebox{1ex}{${\mathrm{Fe}}^{2+}$}\!\left/ \!\raisebox{-1ex}{$\mathrm{Fe}$}\right.}^{\circ }<mspace\; width="1em"></mspace>=<mspace\; width="1em"></mspace>-0.441<mspace\; width="1em"></mspace>\mathrm{V}<mspace\; width="1em"></mspace>and<mspace\; width="1em"></mspace>E_{\raisebox{1ex}{${\mathrm{Fe}}^{3+}$}\!\left/ \!\raisebox{-1ex}{${\mathrm{Fe}}^{2+}$}\right.}^{\circ }<mspace\; width="1em"></mspace>=0.771<mspace\; width="1em"></mspace>\mathrm{V}$, the standard emf of the reaction

$\mathrm{Fe}<mspace\; width="1em"></mspace>+<mspace\; width="1em"></mspace>2{\mathrm{Fe}}^{3+}<mspace\; width="1em"></mspace>\stackrel{<mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace>}{\to }3{\mathrm{Fe}}^{2+}$will be

1. 0.111V

2. 0.330V

3. 1.653V

4. 1.212V

$E_{\raisebox{1ex}{${\mathrm{Fe}}^{2+}$}\!\left/ \!\raisebox{-1ex}{$\mathrm{Fe}$}\right.}^{\circ }<mspace\; width="1em"></mspace>=<mspace\; width="1em"></mspace>-0.441<mspace\; width="1em"></mspace>\mathrm{V}<mspace\; width="1em"></mspace>\text{और}<mspace\; width="1em"></mspace><mspace\; width="1em"></mspace>E_{\raisebox{1ex}{${\mathrm{Fe}}^{3+}$}\!\left/ \!\raisebox{-1ex}{${\mathrm{Fe}}^{2+}$}\right.}^{\circ }<mspace\; width="1em"></mspace>=0.771<mspace\; width="1em"></mspace>\mathrm{V}$, 

$$\begin{gathered} \mathrm{Fe}<mspace\; width="1em"></mspace>+<mspace\; width="1em"></mspace>2{\mathrm{Fe}}^{3+}<mspace\; width="1em"></mspace>\stackrel{<mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace>}{\to }3{\mathrm{Fe}}^{2+}<mspace\; width="1em"></mspace>\text{अभिक्रिया\hspace{0.17em}का\hspace{0.17em}मानक\hspace{0.17em}विद्युत\hspace{0.17em}वाहक\hspace{0.17em}बल\hspace{0.17em}होगा}<mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace>\left[2006\right] \\ \left(1\right)<mspace\; width="1em"></mspace>0.111<mspace\; width="1em"></mspace>\mathrm{V} \\ \left(2\right)<mspace\; width="1em"></mspace>0.330<mspace\; width="1em"></mspace>\mathrm{V} \\ \left(3\right)<mspace\; width="1em"></mspace>1.653<mspace\; width="1em"></mspace>\mathrm{V} \\ \left(4\right)<mspace\; width="1em"></mspace>1.212<mspace\; width="1em"></mspace>\mathrm{V} \end{gathered}$$

If the E°_cell for a given reaction has a negative value, which of the following gives correct relationships for the values of $∆$G° and K_eq ?

(1) $∆$G° >0;  K_eq< 1

(2) $∆$G° >0; K_eq>1

(3) $∆$G° < 0; K_eq> 1

(4) $∆$G° <0; K_eq< 1

यदि दी गई अभिक्रिया के लिए E°_सेल का ऋणात्मक मान है, तो निम्नलिखित में से कौन $△$G° और K_{तुल्यांक}  के मानों के लिए सही संबंध देता है?

(1) $∆$G° >0;  K_{तुल्यांक} < 1

(2) $∆$G° >0; K_{तुल्यांक} >1

(3) $∆$G° < 0; K_{तुल्यांक} > 1

(4) $∆$G° <0; K_{तुल्यांक} < 1

What is the value of ${\mathrm{pK}}_{\mathrm{b}}<mspace\; width="1em"></mspace>({\mathrm{CH}}_3{\mathrm{COO}}^{-}<mspace\; width="1em"></mspace>)$ if ${\mathrm{\lambda }}_{\mathrm{m}}^0=<mspace\; width="1em"></mspace>390<mspace\; width="1em"></mspace>\&<mspace\; width="1em"></mspace>{\mathrm{\lambda }}_{\mathrm{m}}<mspace\; width="1em"></mspace>=<mspace\; width="1em"></mspace>7.8$ for 0.04 of a $<mspace\; width="1em"></mspace>{\mathrm{CH}}_3\mathrm{COOH}$  at $25°\mathrm{C}$ ?

(A) 9.3                                               

(B) 9.2

(C) 4.7                                               

(D) 4.8

$p{K}_b<mspace\; width="1em"></mspace>(C{H}_{3}CO{O}^{-}<mspace\; width="1em"></mspace>)<mspace\; width="1em"></mspace>\text{का\hspace{0.17em}मान\hspace{0.17em}क्या\hspace{0.17em}है\hspace{0.17em}यदि\hspace{0.17em}}25°C<mspace\; width="1em"></mspace>\text{पर\hspace{0.17em}}0.04<mspace\; width="1em"></mspace>C{H}_{3}COOH<mspace\; width="1em"></mspace>\text{के\hspace{0.17em}लिए}<mspace\; width="1em"></mspace>{\lambda }_m^0=<mspace\; width="1em"></mspace>390<mspace\; width="1em"></mspace>\text{और}<mspace\; width="1em"></mspace>{\lambda }_m<mspace\; width="1em"></mspace>=<mspace\; width="1em"></mspace>7.8<mspace\; width="1em"></mspace>\text{है\hspace{0.17em}\hspace{0.17em}}$
$$

(1) 9.3

(2) 9.2

(3) 4.7

(4) 4.8