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

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Chemistry
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Define terms: Fuel cell

Appears in 15 question papers
Chapter: [0.04] 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: [0.13] Amines
Concept: Amines > Preparation of Amines

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

Draw the structures of the HClO3.

Appears in 10 question papers
Chapter: [7.03] Group 17 Elements
Concept: P - Block Group 17 Elements > Oxoacids of Halogens

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: [0.05] 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 elements of Group 15 Elements > Dinitrogen

State Henry’s law.

Appears in 5 question papers
Chapter: [0.02] Solutions and Colligative Properties
Concept: Solubility > Solubility of a Gas in a Liquid

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

Appears in 5 question papers
Chapter: [0.09] Coordination Compounds
Concept: Bonding in Coordination Compounds > Crystal Field Theory (CFT)

Explain the term Antiseptics

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

Explain the term osmosis.

Appears in 4 question papers
Chapter: [0.02] Solutions
Concept: Colligative Properties and Determination of Molar Mass > Osmosis and Osmotic Pressure

Explain the term osmosis.

Appears in 4 question papers
Chapter: [0.02] Solutions and Colligative Properties
Concept: Colligative Properties and Determination of Molar Mass > Osmosis and Osmotic Pressure

Define limiting molar conductivity.

Appears in 4 question papers
Chapter: [0.04] 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: [0.05] 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: [0.05] Chemical Kinetics
Concept: Factors Influencing Rate of a Reaction

Explain pseudo-first-order reaction with an example.

Appears in 4 question papers
Chapter: [0.06] Chemical Kinetics
Concept: Pseudo First Order Reaction

Describe the manufacturing of H2SO4 by the contact process.

Appears in 4 question papers
Chapter: [0.07] Elements of Groups 16, 17 and 18
Concept: Chemical Properties of Elements of Groups 16, 17 and 18

Elements of group 16 have lower ionization enthalpy values compared to those of group 15 elements. Explain why?

Appears in 4 question papers
Chapter: [0.07] Elements of Groups 16, 17 and 18
Concept: Atomic and Physical Properties of Elements of Group 16, 17 and 18

[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: [0.09] Coordination Compounds
Concept: Bonding in Coordination Compounds > Magnetic Properties of Coordination Compounds

Distinguish between crystalline solid and amorphous solid

Appears in 3 question papers
Chapter: [0.01] Solid State
Concept: Types of Solids

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

Appears in 3 question papers
Chapter: [0.01] Solid State
Concept: Calculations Involving Unit Cell Dimensions
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