31.

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

A 35% solution LiCl was electrolysed by using a 2.5A current for 0.8h.Assuming thecurrent efficiency of 90%. The mass of LiOHproduced at the end of electrolysis.
[Atomic mass of Li=7] is:

• 1.61 g

• 2.71 g

• 4.02 g

• 3.70 g

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

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

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

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

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

In the crystal of CsCl, the co-ordination number changes from 8:8 to 6:6 by:

• applying high pressure

• applying low temperature

• applying high temperature

• applying low pressure

What are the spin only magnetic moments (in BM) for Ni (II) ion in square planar arid octahedral geometry, respectively?

• 0 and 2.83

• 2.83 and 2.83

• O and 1.73

• O and O

Which of the following formula is applicable for weak electrolyte:

• $\mathrm{\alpha }=\frac{{\mathrm{\lambda }}_{\mathrm{m}}}{{\mathrm{\lambda }}_{\mathrm{m}}^{\circ }}$

• ${\mathrm{K}}_{\mathrm{a}}=\frac{{\mathrm{C\alpha }}^2}{(1-\mathrm{\alpha })}$

• ${\mathrm{K}}_{\mathrm{a}}=\frac{{\mathrm{C\lambda }}_{\mathrm{m}}^2}{{\mathrm{\lambda }}_{\mathrm{m}}^{\circ }({\mathrm{\lambda }}_{\mathrm{m}}^{\circ }-{\mathrm{\lambda }}_{\mathrm{m}})}$

• All of these

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)

Given that the temperature co-efficient for the saponification of ethyl acetate by NaOH is 1.75. The value of activation is:

• 9.207 Kcal mol^-1

• 10.207 Kcal mol^-1

• 4.0456 Kcal mol^-1

• 7.041 Kcal mol^-1

In the extraction of copper from its sulphide ore, the metal is formed by reduction of Cu₂O with:

• CO

• SO₂

• Cu₂S

• FeS

Which one of the following is used for the estimation of hardness of water:

• E.D.T.A

• Dimethyl glyoxime

• Ethylene diamine

• Triphenyl phosphine