A metal has a fcc lattice. The edge length of the unit cell is 404 pm. The density of the metal is 2.72 g cm³. The molar mass of the metal is (N_A  vogadro's constant = 6.02x 10²³ mol^-1).

• 40 g mol^-1

• 30 g mol^-1

• 27g mol^-1

• 20 g mol^-1

A magnetic moment of 1.73 BM will be shown by one among the following

• [Cu(NH₃)₄]²⁺

• [Ni(CN)₄]^2-

• TiCl₄

• [CoCl₆]^4-

Roasting of sulphides gives the gas X as a by-product. This is a colourless gas with choking smell of burnt sulphur. and causes great damage to respiratory organs as a result of acid rain. Its aqueous solution is acidic acts as a reducing agent and its acid has never been insolated. The gas X is

• H₂S

• SO₂

• CO₂

• SO₃

Which is the strongest acid in the following?

• H₂SO₄

• HClO₃

• HClO₄

• H₂SO₃

Which of the following does not give oxygen on heating?

• KClO₃

• Zn(ClO₃)₂

• K₂Cr₂O₇

• (NH₄)₂Cr₂O₇

Which ofthe following lanthanoid ions is diamagnetic?
(At. nos. Ce = 58, Sm = 62, Eu = 63, Yb= 70)

• Ce²⁺

• Sm²⁺

• Eu²⁺

• Yb²⁺

Which of the following is a polar molecule?

• BF₃

• SF₄

• SiF₄

• XeF₄

Reaction by which benzaldehyde cannot be prepared?

Structure of the compound whose IUPAC name is 3-ethyl-2-hydroxy-4-methylhex-3-en-5-ynoic acid is

40.

Antiseptics and disinfectants either kill or prevent growth of microorganisms. Identify which of the following is not true.

• A 0.2% solution of phenol is an antiseptic while 1% solution acts as a disinfectant.

• Chlorine and iodine are used as strong disinfectants.

• Dilute solutions of boric acid and hydrogen, peroxide are strong antiseptics.

• Disinfectants harm the living tissues.