Chemistry Test ...

The atomic number of nitrogen is 7 and that of hydrogen is \(1 .\) How many electrons are there in ammonium ion, \(\mathrm{N H}_{4}^{+}\) ?

Which of the following would be expected to have the largest entropy per mole?

Acidic buffer solution is produced on mixing the aqueous solutions of

If 0.5 g of a solute (molar mass 100 g mol^-1) in 25 g of solvent elevates the boiling point by 1 K. The molar boiling point constant of the solvent is

How many moles of magnesium phosphate Mg₃(PO₄)₂ will contain 0.25 moles of oxygen atoms?

The values of heat of combustion of rhombic sulphur and monoclinic sulphur are 70960 calories and 71030 calories, respectively. What is the heat of conversion of rhombic sulphur to monoclinic sulphur?

Which of the following aqueous solutions will have the lowest vapour pressure at room temperature?

For Zn²⁺/Zn = - 0.76 V, Cl₂/Cl^- = 1.36 V, H⁺/ (1/2)H₂ = 0 V and Fe³⁺/Fe²⁺ = 0.77 V, the increasing order of strengths as a reducing agent is

The plot of ln C_{0 /}C_t against t is a straight line; the order of the reaction is expected to be:

The third line of Balmer series in the emission spectrum of hydrogen atom is due to the transition from the