Give the uses of zinc.

The selection of reducing agent depends on the thermodynamic factor: Explain with an example.

Complete the following reactions.
a. \(B(OH)_3 + NH_3\longrightarrow \)
b. \(Na_{ 2 }B_{ 4 }{ O }_{ 7 }+{ { H }_{ 2 }{ SO }_{ 4 }+{ 5H }_{ 2 }O\longrightarrow }\)
c. \({ B }_{ 2 }{ H }_{ 6 }+2NaOH+2{ H }_{ 2 }O\longrightarrow \)
d. \({ B }_{ 2 }{ H }_{ 6 }+6{ CH }_{ 3 }OH\longrightarrow \)
e. \(4{ BF }_{ 3 }+3{ H }_{ 2 }O\longrightarrow \)
f. \(HCOOH+{ H }_{ 2 }{ SO }_{ 4 }\longrightarrow \)
g. \(2SiCl_{ 4 }+NH\)₃
h. SiCl₄ + 4C₂H₅OH \(\rightarrow\)
i. 2\(B+6NaOH\longrightarrow \)
j. \({ H }_{ 2 }{ B }_{ 4 }{ O }_{ 7 }\overset { Red\ hot }{ \rightarrow } \)

Give the uses of argon.

What are interstitial compounds?

In an octahedral crystal field, draw the figure to show splitting of d orbitals

Why ionic crystals are hard and brittle?

Consider the oxidation of nitric oxide to form NO₂
2NO_(g) + O_2(g) ➝2NO_2(g)
(a). Express the rate of the reaction in terms of changes in the concentration of NO,O₂ and NO₂.
(b). At a particular instant, when [O₂] is decreasing at 0.2 mol L⁻¹s⁻¹ at what rate is [NO₂] increasing at that instant?

Rate constant k of a reaction varies with temperature T according to the following Arrhenius equation  \(\log K=\log A-\frac { { E }_{ a } }{ 2.303R } \left( \frac { 1 }{ T } \right) \)Where E_a is the activation energy. When a graph is plotted for log k Vs \(\frac{1}{T}\) a straight line with a slope of -4000K is obtained. Calculate the activation energy.

When aqueous ammonia is added to CuSO₄ solution, the solution turns deep blue due to the formation of tetra ammine copper (II) complex,\({ [Cu({ H }_{ 2 }O)_4] }_{ (aq) }^{ 2+ }+ 4{ NH }_{ 3 }(aq)\rightleftharpoons { [Cu{ ({ NH }_{ 3 }) }_{ 4 }] }_{ (aq) }^{ 2+ }\) among H₂O and NH₃ Which is stronger Lewis base.

A solution of 0.10M of a weak electrolyte is found to be dissociated to the extent of 1.20% at 25^oC. Find the dissociation constant of the acid.

Explain the function of H₂ - O₂ fuel cell.

The resistance of a conductivity cell is measured as 190 Ω using 0.1M KCl solution (specific conductance of 0.1M KCl is 1.3 Sm^-1). When the same cell is filled with 0.003 M sodium chloride solution, the measured resistance is 6.3KΩ. Both these measurements are made at a particular temperature. Calculate the specific and molar conductance of NaCl solution.

What happens when a colloidal sol of Fe(OH)₃ and As₂S₃ are mixed?

Comment on the statement: Colloid is not a substance but it is a state of substance.

Complete the following reactions

ii) \(C_6H_5-CH_{2}CH(OH)CH(CH_3)_2 \overset{ConH_2SO_4}\longrightarrow\)

How will you convert benzaldehyde into the following compounds?
(i) benzophenone
(ii) benzoic acid
(iii) α-hydroxyphenylaceticacid.

Complete the following reaction

Give two difference between Hormones and vitamins.

Write the structural formula of aspirin.

Name some reducing agents used to convert Metal oxides to metal

What is burnt alum?

Arrange the following as indicated below:
(i) F₂, Cl₂, Br₂, I₂ - increasing bond dissociation enthalpy.
(ii) HF, HCI, HBr, HI - increasing acidic strength.

Complete the following equations.
(i) 2 CrO₄^2- + 2H+ ⟶
(ii) KMnO₄ ⟶

Calculate the magnetic moment of [Fe(H₂O)₆]²⁺, if atomic number of Fe is 26.

Frenkel defect is not show by alkali metal halides but silver halides do. Give reason.

Define:- Half life period.

Define degree of dissociation.

What are secondary cells?

What is Tyndall effect?