MCQ
aq. $NaOH + P_4$ (white) $\rightarrow PH_3 + X;$ compound $X$ is
- ✓$NaH_2PO_2$
- B$NaHPO_4$
- C$Na_2CO_3$
- D$NaHCO_3$
$P _4+3 NaOH +3 H _2 O \rightarrow PH _3+3 NaH _2 PO _2$
White phosphorus react with sodium hydroxide and water to produce phosphine and sodium hypophosphite. Sodium hydroxide - cold, concentrated solution. This reaction takes place slow.
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(Given : Atomic masses: $C$ : $12.0\, u$, $H : 1.0\, u , N : 14.0\, u , Br : 80.0\, u ]$
Assertion $A$ : $\left[ CoCl \left( NH _3\right)_5\right]^{2+}$ absorbs at lower wavelength of light with respect to $\left[ Co \left( NH _3\right)_5\left( H _2 O \right)\right]^{3+}$
Reason $R$ : It is because the wavelength of the light absorbed depends on the oxidation state of the metal ion.
In the light of the above statements, choose the correct answer from the options given below :
$[Co(en)_3]\,[Cr(C_2O_4)_3]$
$[Cu(NH_3)_4]\, [CuCl_4]$
$[Ni(en)_3]\,[Co(NO_2)_6]$
$\left[ Ag \left( H _{2} O \right)_{2}\right]\left[ Ag ( CN )_{2}\right]$ is :