MCQ
The compound $YB{a_2}C{u_3}{O_7}$ which shows superconductivity has copper in oxidation state ........ Assume that the rare earth element Yttrium is in its usual $ + \,3$ oxidation state
- A$3/7$
- ✓$7/3$
- C$3$
- D$7$
✓
Answer
Correct option: B.
$7/3$
(b) $B{a_2}\mathop {C{u_3}}\limits^{ * \,\,} {O_7}$
$3 + 2 \times 2 + 3x - (2 \times 7) = 0$
$3 + 4 + 3x - 14 = $$3x = 7$
$x = \frac{7}{3}$.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
Reduction of the metal centre in aqueous permanganate ion involves
→$(A)$ $3$ electrons in neutral medium
$(B)$ $5$ electrons in neutral medium
$(C)$ $3$ electrons in alkaline medium
$(D)$ $5$ electrons in acidic medium
The $IUPAC$ name of is
→The unit of ionic product of water ${K_w}$ are
→Which alkene is most stable
If concentration of reactants and products are doubled then value of equilibrium constant KC is equal to which of the following:
In which of the following molecule or ion sulphur has minimum oxidation number
Identify the compound in which steric inhibition of resonance is present
What is the major product of the following reaction $C{H_3}C \equiv C - C{H_2} - C{H_3}\xrightarrow{{1\,\,{\text{mole}}\,\,{\text{of}}\,C{l_2}}}$
→$2 O _{3}( g ) \rightleftharpoons 3 O _{2}( g )$
→At $300 \,K$, ozone is fifty percent dissociated. The standard free energy change at this temperature and $1\, atm$ pressure is $(-)$ $........\,J\, mol ^{-1}$ (Nearest integer)
[Given: $\ln 1.35=0.3$ and $R =8.3 J K ^{-1} mol ^{-1}$ ]
Acetic acid is a weak electrolyte because