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Important Questions for HSC Science (General) 12th Board Exam - Maharashtra State Board - Chemistry

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Define terms: Fuel cell

Appears in 13 question papers
Chapter: [4] Electrochemistry
Concept: Batteries > Primary Batteries

Write the chemical equations involved in the following reactions:(i) Hoffmann-bromamide degradation reaction

Appears in 12 question papers
Chapter: [13.01] Amines
Concept: Amines > Preparation of Amines

The following data were obtained during the first order thermal decomposition of SO2Cl2 at a constant volume :

SO2Cl2 (g) → SO2 (g) + Cl2 (g)

Experiment Time/s–1 Total pressure/atm
1 0 0.4
2 100 0.7

Calculate the rate constant.

(Given : log 4 = 0.6021, log 2 = 0.3010)

Appears in 6 question papers
Chapter: [5] Chemical Kinetics
Concept: Factors Influencing Rate of a Reaction

Account for the following : Nitrogen does not form pentahalide.

Appears in 6 question papers
Chapter: [7.01] Group 15 Elements
Concept: P - Block Group 15 Elements > Dinitrogen

State Henry’s law.

Appears in 5 question papers
Chapter: [2] Solutions and Colligative Properties
Concept: Solubility > Solubility of a Gas in a Liquid

Explain the term Antiseptics

Appears in 5 question papers
Chapter: [16.01] Chemicals in Medicines
Concept: Drugs and Their Classification

Define limiting molar conductivity.

Appears in 4 question papers
Chapter: [4] Electrochemistry
Concept: Conductance of Electrolytic Solutions > Variation of Conductivity and Molar Conductivity with Concentration

For a reaction A + B ⟶ P, the rate is given by

Rate = k [A] [B]2

How is the rate of reaction affected if the concentration of B is doubled?

Appears in 4 question papers
Chapter: [5] Chemical Kinetics
Concept: Factors Influencing Rate of a Reaction

For a reaction A + B ⟶ P, the rate is given by

Rate = k [A] [B]2

What is the overall order of reaction if A is present in large excess?

Appears in 4 question papers
Chapter: [5] Chemical Kinetics
Concept: Factors Influencing Rate of a Reaction

[NiCl4]2− is paramagnetic, while [Ni(CO)4] is diamagnetic, though both are tetrahedral. Why? (Atomic number of Ni = 28)

Appears in 4 question papers
Chapter: [9] Coordination Compounds
Concept: Bonding in Coordination Compounds > Magnetic Properties of Coordination Compounds

On the basis of crystal field theory, write the electronic configuration for d4 ion if ∆0 < P.

Appears in 4 question papers
Chapter: [9] Coordination Compounds
Concept: Bonding in Coordination Compounds > Crystal Field Theory (CFT)

Distinguish between crystalline solid and amorphous solid

Appears in 3 question papers
Chapter: [1] Solid State
Concept: Amorphous and Crystalline Solids

An element crystallizes in a f.c.c. lattice with cell edge of 250 pm. Calculate the density if 300 g of this element contain 2 × 1024 atoms.

Appears in 3 question papers
Chapter: [1] Solid State
Concept: Calculations Involving Unit Cell Dimensions

An element with molar mass 27 g mol−1 forms a cubic unit cell with edge length 4.05 ✕ 10−8 cm. If its density is 2.7 g cm−3, what is the nature of the cubic unit cell?

Appears in 3 question papers
Chapter: [1] Solid State
Concept: Number of Atoms in a Unit Cell

Define the following term

Schottky defect

Appears in 3 question papers
Chapter: [1] Solid State
Concept: Imperfections in Solids - Introduction

An element with density 2.8 g cm–3 forms a f.c.c. unit cell with edge length 4 x 10–8 cm. Calculate the molar mass of the element.

(Given : NA = 6.022 x 1023 mol –1)

Appears in 3 question papers
Chapter: [1] Solid State
Concept: Calculations Involving Unit Cell Dimensions

Calculate the freezing point of solution when 1.9 g of MgCl2 (M = 95 g mol−1) was dissolved in 50 g of water, assuming MgCl2 undergoes complete ionization.

(Kf for water = 1.86 K kg mol−1)

Appears in 3 question papers
Chapter: [2] Solutions and Colligative Properties
Concept: Colligative Properties and Determination of Molar Mass > Depression of Freezing Point

What happens when the external pressure applied becomes more than the osmotic pressure of solution?

Appears in 3 question papers
Chapter: [2] Solutions and Colligative Properties
Concept: Colligative Properties and Determination of Molar Mass > Osmosis and Osmotic Pressure

When 2.56 g of sulphur was dissolved in 100 g of CS2, the freezing point lowered by 0.383 K. Calculate the formula of sulphur (Sx).

(Kf for CS2 = 3.83 K kg mol−1, Atomic mass of sulphur = 32 g mol−1]

Appears in 3 question papers
Chapter: [2] Solutions and Colligative Properties
Concept: Colligative Properties and Determination of Molar Mass > Depression of Freezing Point

Blood cells are isotonic with 0.9% sodium chloride solution. What happens if we place blood cells in a solution containing

(i) 1.2% sodium chloride solution?

(ii) 0.4% sodium chloride solution?

Appears in 3 question papers
Chapter: [2] Solutions and Colligative Properties
Concept: Colligative Properties and Determination of Molar Mass > Osmosis and Osmotic Pressure
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