List of top Questions asked in Maharashtra Class XII

Define the following terms: Isotonic solution, Osmosis. Gold crystallises into face-centred cubic cells. The edge length of unit cell is \( 4.08 \times 10^{-8} \) cm. Calculate the density of gold. [Molar mass of gold = 197 g mol\(^{-1}\)]
Define reference electrode. Write functions of salt bridge. Draw neat, labelled diagram of standard hydrogen electrode (SHE).
Explain metal deficiency. Write uses of sulphur. Write chemical equation for preparation of sulphur dioxide from sulphur.
What is the action of selenium on magnesium metal?
Henry’s law constant for CH\(_3\)Br(g) is 0.159 mol dm\(^{-3}\) bar\(^{-1}\) at 25°C. What is solubility of CH\(_3\)Br(g) in water at same temperature and partial pressure of 0.164 bar?
What is lanthanoid contraction? Write preparation of acetic acid from dry ice and ethyl chloride.
The standard potential of the cell in the following reaction is ______________.
Cd(s) + Cu\(^{2+}\) (aq) \to Cd\(^{2+}\) (aq) + Cu(s)
(E\(^\circ\)_Cd = -0.403 V, E\(^\circ\)_Cu = 0.334 V)
The value of [H\(_3\)O\(^+\)] in mol lit\(^{-1}\) of 0.001 M acetic acid solution (\( K_a = 1.8 \times 10^{-5} \)) is _________.
Write the name of biodegradable polyamide copolymer.
Which of the following transition element shows maximum oxidation state?
The correct formula for the complex compound, Na\(_2\) [Fe(CN)\(_4\)](III) is
The name of metal nanoparticle which acts as highly effective bacterial disinfectant in water purification process is ________________.
Acid anhydride on reaction with primary amine gives compound having a functional group
The enthalpy change for the chemical reaction \( H_2 (g) \to H_2 O(l) \) is called enthalpy of