Hydrogen gas is prepared in the laboratory by reacting dilute HCL with granulated zinc. Following reaction takes place.\(Zn+2HCL\rightarrow { ZnCL }_{ 2 }+{ H }_{ 2 }\)
Calculate the volume of hydrogen gas liberated at STP when 32.65 g of zinc reacts with HCL. 1 mole of a gas occupies 22.7 L volume at STP; atomic mass of Zn = 65.3\(\mu\)

Justify the given statement with suitable examples "the properties of the elements are a periodic function of their atomic number".

Write the significance/applications of dipole moment.

What is an ionic bond? With two suitable examples the difference between an ionic and a covalent bond?

At 60°C, dinitrogen tetroxide is 50 per cent dissociated. Calculate the standard free energy change at this temperature and at one atmosphere.

PCl_5,PCl₃, and Cl₂ are at equilibrium at 500 k in a closed container and their concentrations are \(0.8\times { 10 }^{ -3 }\)mol L^-1,\(1.2\times { 10 }^{ -3 }\)mol L^-1  and  \(1.2\times { 10 }^{ -3 }\) , mol L^-1, respectively. Calculate the value of K_c for the reaction \({ PCl }_{ 5 }(g)\rightleftharpoons { PCl }_{ 3 }(g)+{ Cl }_{ 2 }(g)\) will be

An ionic hydride of an alkali metal has significant covalent character and is almost unreactive towards oxygen and chlorine. This is used in the synthesis of other useful hydrides. Write its reaction with \({ Al }_{ 2 }{ Cl }_{ 6 }\)

Calculate the mass of oxygen which will be liberated by the decomposition of 200mL of this solution.

When an electric discharge is passed through hydrogen gas, the hydrogen molecules dissociated to produce excited hydrogen atoms. These excited atoms emit electromagnetic radiation of discrete frequencies which can be given by the general formula
\(\bar{v}=109677\left[\frac{1}{n_{i}^{2}}-\frac{1}{n_{f}^{2}}\right]\)
What points of Bohr's model of an atom can be used to arrive at this formula? Based on these points derive the above formula giving description of each step and each term.