The colour of the flame of sodium is

• deep red

• blue

• green

• golden yellow

Which of the following is the strongest reducing agent?

• HF

• HCl

• HI

• HBr

Formula of hexaaqua manganese (II) phosphate is

• [Mn(H₂O)]₆PO₄

• [Mn(H₂O)₆]₃PO₄

• [Mn(H₂O)₆]₃(PO₄)₂

• [Mn(H₂O)₆](PO₄)₃

Which transition element of the following outermost electronic configuration shows the highest oxidation state?

• 3d³, 4s²

• 3d⁵, 4s¹

• 3d⁵, 4s²

• 3d⁶, 4s²

Which of the following is not a method of preparation of colloidal solution?

• Electrical dispersion

• Peptization

• Coagulation

• Mechanical dispersion

The formula of chromyl chloride is

• CrO₂Cl₂

• CrOCl₂

• CrCl₃

• Cr₂OCl₂

What is the magnetic moment value of Fe²⁺ ion in [Fe(CN)₆]^4- ?

• 0

• $\sqrt{3}$

• $\sqrt{24}$

• $\sqrt{8}$

28.

The standard reduction potential E° for half-reactions are

Zn → Zn²⁺ + 2e^- ; E° = +0.76 V

Fe → Fe²⁺ + 2e^- ; E° = +0.41 V

The EMF of the cell reaction

Fe²⁺ + Zn → Zn²⁺ + Fe is

• +1.28 V

• -1.28 V

• +0.35 V

• -0.35 V

Aqueous solution of Na₂SO₃ on reaction with Cl₂ gives

• Na₂S₄O₆

• NaOH

• NaHSO₄

• NaCl

The lanthanoid contraction is responsible for the fact that

• Zn and Y have about same radius

• Zr and Nb have similar oxidation states

• Zr and Hf have about the same radius

• Zr and Zn have the same oxidation state