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

Write down the IUPAC name of the following complex: [Co(NH₃)₅ (NO₂)](NO₃)₂

A first order reaction takes 23.1 minutes for 50% completion. Calculate the time required for 75% completion of this reaction.

(log 2 = 0.301, log 3 = 0.4771, log 4 = 0.6021)

Write the IUPAC name of the given compound:

When a co-ordination compound CrCl₃.6H₂O is mixed with AgNO₃, 2 moles of AgCl are precipitated per mole of the compound. Write

(i) Structural formula of the complex.

(ii) IUPAC name of the complex.

Write down the IUPAC name of the following complex: [Cr(NH₃)₂Cl₂(en)]Cl (en = ethylenediamine)

Define limiting molar conductivity.

Why conductivity of an electrolyte solution decreases with the decrease in concentration ?

A first order reaction takes 30 minutes for 50% completion. Calculate the time required for 90% completion of this reaction.

(log 2 = 0.3010)

Write down the IUPAC name of the complex [Pt(en)₂Cl₂]²⁺. What type of isomerism is shown by this complex?

The conductivity of 0.20 mol L⁻¹ solution of KCl is 2.48 × 10⁻² S cm⁻¹. Calculate its molar conductivity and degree of dissociation (α). Given λ⁰ (K⁺) = 73.5 S cm² mol⁻¹ and λ⁰ (C1⁻) = 76.5 S cm² mol⁻¹.

Why does the conductivity of a solution decrease with dilution?

Write the IUPAC name of the complex [Cr(NH₃)₄ Cl₂]Cl.

Define the following terms: Molar conductivity (⋀_m)

Explain ionic solids are hard and brittle.

Copper crystallises into a fcc lattice with edge length 3.61 × 10⁻⁸ cm. Show that the calculated density is in agreement with its measured value of 8.92 g cm⁻³.

An ionic compound crystallises in FCC type structure with ‘A’ ions at the centre of each face and ‘B’ ions occupying corners of the cube. The formula of compound is _______.

0.05 M NaOH solution offered a resistance of 31.6 Ω in a conductivity cell at 298 K. If the cell constant of the cell is 0.367 cm^-1, calculate the molar conductivity of NaOH solution.

Which of the following vitamins is the vitamin of alicyclic series?

(A) Vitamin C

(B) Vitamin K

(C) Vitamin B

(D) Vitamin A

The unit of rate constant for zero order reaction is _______.

(A) t^–1

(B) mol dm^–3 t^–1

(C) mol^–1 dm³ t^–1

(D) mol^–2 dm⁶ t^–1

10.0 grams of caustic soda when dissolved in 250 cm³ of water, the resultant gram molarity of solution is _______.

(A) 0.25 M

(B) 0.5 M

(C) 1.0 M

(D) 0.1 M