Which of the following molecules forms no inter molecular hydrogen bonds?

• ${\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{OH}$

• HF

• ${\mathrm{CH}}_3{\mathrm{COCH}}_3$

• ${\mathrm{CH}}_3\mathrm{COOH}$

Which of the following metals, Fe, Zn, Pb, Ag and Pt do not give a metal nitrate on treatment with concentrated HNO?

• Fe and Zn.

• Fe and Pt.

• Pb, Ag and pt.

• Fe, Ag and Zn.

The oxidation number of sulphur atoms in peroxomonosulphuric acid H₂SO₅ and peroxodisulphuric acid H₂S₂O₈, respectively are:

• +8 and +7

• +6 and +6

• +4 and +6

• +3 and +3

When aqueous ammonia is added to green solution of nickel chloride, the colour changes to:

• yellow

• purple

• violet

• violet

Organophosphorus compounds are the most toxic insecticides. The common organophosphorus insecticides is:

• Methoxy chlor

• Dieldrin

• Parathion

• Malathion

In trimeta-phosphate ion, the number of 0 atom P-O-P bonds and unit negative charges are respectively:

• 6,6,3

• 3,6,3

• 9,3,3

• 9,6,3

Which of the following is the laboratory method for synthesis of nitric oxide?

• Reaction of zinc with cold and dilute HNO₃

• Reaction of zinc with concentrated HNO₃

• Reaction of copper with cold and dilute HNO₃

• Heating NH₄NO₃

The basic strengths of conjugate bases of oxyacids ofCl will be in the order.

• ${\mathrm{Cl}}_4^{-}<{\mathrm{ClO}}_3^{-}<{\mathrm{ClO}}_2^{-}<{\mathrm{ClO}}^{-}$

• ${\mathrm{ClO}}_3^{-}<{\mathrm{ClO}}_2^{-}<{\mathrm{ClO}}^{-}<{\mathrm{ClO}}_4^{-}$

• ${\mathrm{ClO}}^{-}<{\mathrm{Cl}}_4^{-}<{\mathrm{ClO}}_3^{-}<{\mathrm{ClO}}_2^{-}$

• ${\mathrm{Cl}}_4<{\mathrm{ClO}}_2^{-}<{\mathrm{ClO}}_3^{-}<{\mathrm{ClO}}^{-}$

1189.

Which one of the following phosphorous compound is used during electrode position of metal on rubber and for making pesticides?

• Phosphorus pentachloride (PCl₅)

• Phosphorus (Ill) oxide (P₄O₈)

• Phosphorus M oxide (P₄O₁₀)

• Phosphorus trichloride (PCl₃)

Reduction potential of some ions are given below:

Arrange them in decreasing order of oxidising power.

Ions Reduction : Cl${\mathrm{O}}_4^{-}$ I${\mathrm{O}}_4^{-}$ Br${\mathrm{O}}_4^{-}$

Potential E^v = 1.19 V   E^v = 1.741

Potential E^v / V

• Cl${\mathrm{O}}_4^{-}$ > I${\mathrm{O}}_4^{-}$ < Br${\mathrm{O}}_4^{-}$

• I${\mathrm{O}}_4^{-}$ > Br${\mathrm{O}}_4^{-}$ < Cl${\mathrm{O}}_4^{-}$

• Br${\mathrm{O}}_4^{-}$ < I${\mathrm{O}}_4^{-}$ < Cl${\mathrm{O}}_4^{-}$

• Br${\mathrm{O}}_4^{-}$ < Cl${\mathrm{O}}_4^{-}$ < I${\mathrm{O}}_4^{-}$