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:

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

The correct statement regarding colour of Zn²⁺, Ni²⁺and Cr³⁺among the following is:

The incorrect statement regarding the transition metals is:

Cerium(Z=58) is an important member of lanthanoids. Which of the following statements about cerium is incorrect

(1) The common oxidation states of cerium are +3 and +4.

(2) Cerium (IV) acts as an oxidising agent

(3) The +4 oxidation state of cerium is not known in solutions

(4) The +3 oxidation state of cerium is more stable than the +4 oxidation state.

When d⁸ arrangement in nickel ion changes from a weak octahedral field in $\left[Ni\right(H_{2}O{)}_6{]}^{2\oplus }$ to a strong field in $\left[Ni\right(CN{)}_4{]}^{2⊝}$, which orbitals get lowered in energy? Assume tetragonal distortion along the Z-axis.

(1) $d_{x^2-y^2}$

(2) $d_{z^2}$

(3) $d_{xy} , d_{z^2}$

(4) $d_{xz} , d_{yz} , d_{z^2}$