By calculating E^o value of the following reaction,which one of the following reaction are spontaneous.

Given 

$E_{C{u}^{2+}/Cu}^o=0.34 V,E_{Z{n}^{2+}/Zn}^o=-0.76 V, E_{A{g}^{+}/Ag}^o=0.80 V.$
$\left(a\right) 2Ag +Z{n}^{2+}\to 2A{g}^{+}+Zn$
$\left(b\right)Cu +Z{n}^{2+}\to Zn +C{u}^{2+}$
$\left(c\right) Zn +C{u}^{2+}\to Z{n}^{2+}+Cu$
$\left(d\right) 2A{g}^{+}+Cu \to 2Ag+C{u}^{2+}$

(A) Only d

(B) Only b

(C) Both c & d

(D) Both a & c

 

Which of the following has maximum number of unpaired electrons?

(1) Fe²⁺

(2) Fe³⁺

(3) Co³⁺

(4) Co²⁺

The atomc number of potassium is 19 & that of manganese is 25. Although the colour of MnO₄^- is dark violet yet the K⁺ is colourless.This is due to the fact that

(1) Mn is a transition element; while K⁺ is not

(2) [MnO₄]^- is negatively charged; while K⁺ has a positive charge.

(3) The effective atomic number of Mn in [MnO₄]^- is 26; while for K⁺ , the atomic number s 18

(4) The Mn in a high positive oxidation state allow charge transfer transitions.

Heating of Ag with dil. HNO₃ give

1. NO

2. NO₂

3. N₂O

4. N₂O₃

Zinc dissolve in an excess of NaOH, because of the formation of

1. ZnO

2. Zn(OH)₂

3. NaZn(OH)₃

4. Na₂ZnO₂

When excess of SnCl₂ is added to HgCl₂, the substance formed is

1. Hg₂Cl₂

2. Sn

3. Hg

4. Cl₂

The oxidation number is changed in which of the following case

1. SO₂ gas is passed into $C{r}_2{O}_7^{2-}/H^{+}$

2. Aqueous solution of $Cr{O}_4^{2-}$ is acidified

3. $Cr{O}_{2}C{l}_2$ is dissolved in NaOH

4. $C{r}_2{O}_7^{2-}$ solution is made alkaline

Which of the following elements form stable dinuclear ions

1. Zn

2. Cd

3. Hg

4. Fe

The correct electronic configuration of Ti(Z=22 atom) is

(1) $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^2$

(2) $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{2}4p^6$

(3) $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^4$

(4) $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^2$

Of the ions, Zn²⁺, Ni²⁺and Cr³⁺(atomic number of Zn =30, Ni=28 and Cr=24).

(1) Only Zn²⁺ is Colourless and  Ni²⁺and Cr³⁺ are coloured

(2) All these are colourless

(3) All these are coloured

(4) Only Ni²⁺ is coloured and Zn²⁺ and Cr³⁺ are colourless.