MCQ
If the angle between the lines given by the equation $x^2-3 x y+\lambda y^2+3 x-5 y+2=0, \lambda \geq 0$, is $\tan ^{-1}\left(\frac{1}{3}\right)$, then $\lambda=$______
- ✓2
- B10
- C$1, \frac{2}{5}$
- D$\frac{2}{3}, 40$
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i. $\ce{PO^{3-}_4}$
ii. $\ce{SO^{2-}_4}$
iii. $\ce{[Fe(CN)6]^{4-}}$
iv. $\ce{NO^-_3}$