HSC Science (Electronics) 12th Standard Board Exam - Maharashtra State Board Question Bank Solutions

A compound forms a hep structure. Calculate the number of octahedral voids in 0.4 mol. (NA = 6.022 × 10²³).

A compound forms a hep structure. Calculate the number of octahedral voids in 0.4 mol. (N_A = 6.022 × 10²³ )

Derive the relation between freezing point depression and molar mass of solute.

(CH₃)₄NI is an example of ______.

Octahedral complex have ______ hybridisation.

How sodium bicarbonate test is used to distinguish between carboxylic acid and phenol?

Calculate the mass of compound to be dissolved in 75g of benzene to lower its freezing point by 0.48 K. (Given: K_f = 0.512 K kg mol^-1 and molar mass = 256g mol^-1)

Give the limitations of VBT.

A compound forms hexagonal close packed (hcp) structure. What is the number of (i) Octahedral voids, (ii) Tetrahedral voids, (iii) Total voids formed in 0.7 mol of it.

Mention the type of hybridization in [Co(NH₃)₆]³⁺ complex.

What is the action of hydrochloric acid on the following ?

\[\ce{NH3}\]

What is the action of hydrochloric acid on the following ? 

\[\ce{Na2CO3}\]

Write the name of metal nanoparticle used to remove E.coli bacteria from water.

Write the chemical reaction when chlorine reacts with dry slaked lime.

Write the chemical reaction involved in Cannizzaro reaction of methanal.

Mention the number of unpaired electrons and geometry of the following complex:

\[\ce{[Ni(Cl)4]^{2-}}\]

Mention the number of unpaired electrons and geometry of the following complex:

\[\ce{[Ni(CN)4]^2-}\]

Calculate the time required to deposit 2.4 g of \[\ce{Cu}\], when 2.03 A of current passed through \[\ce{CuSO4}\], solution. (At. mass of \[\ce{Cu}\] = 63.5 g mol⁻¹)

What is the action of hydrochloric acid on the NH₃?