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

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Describe ‘froth floatation process’ for concentration of sulphide ore.

[6] General Principles and Processes of Isolation of Elements
Chapter: [6] General Principles and Processes of Isolation of Elements
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How does solubility of a gas in water varies with the temperature?

[2] Solutions and Colligative Properties
Chapter: [2] Solutions and Colligative Properties
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3-Methylbutane-2-ol on heating with HI gives ______

[11] Alcohols, Phenols and Ethers
Chapter: [11] Alcohols, Phenols and Ethers
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The Zieglar-Natta catalyst is used in the preparation of _______.

(A) LDPE

(B) PHBV

(C) PAN

(D) HDPE

[15] Introduction to Polymer Chemistry
Chapter: [15] Introduction to Polymer Chemistry
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How is phenol converted into the following?

Benzene

[11] Alcohols, Phenols and Ethers
Chapter: [11] Alcohols, Phenols and Ethers
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How is phenol converted into the following?

benzoquinone

[11] Alcohols, Phenols and Ethers
Chapter: [11] Alcohols, Phenols and Ethers
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How is phenol converted into the following?

picric acid

[11] Alcohols, Phenols and Ethers
Chapter: [11] Alcohols, Phenols and Ethers
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Explain the mechanism of action of hydroiodic acid on 3-methylbutan-2-ol.

[13] Amines
Chapter: [13] Amines
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Mention 'two' uses of propan-2-one.

[13] Amines
Chapter: [13] Amines
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Write the structure of melamine.

[15] Introduction to Polymer Chemistry
Chapter: [15] Introduction to Polymer Chemistry
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Explain the structure of carbonyl functional group

[12.01] Aldehydes and Ketones
Chapter: [12.01] Aldehydes and Ketones
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Write mathematical expression of molar conductivity of the given solution at infinite dilution.

[4] Electrochemistry
Chapter: [4] Electrochemistry
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Write the different oxidation states of manganese.

[8.01] D-block Elements
Chapter: [8.01] D-block Elements
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What is the action of Excess of chlorine on ammonia?

 

 

[7.01] Group 15 Elements
Chapter: [7.01] Group 15 Elements
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What is the action of Na Metal on ammonia? 

[7.01] Group 15 Elements
Chapter: [7.01] Group 15 Elements
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What is the action of the following reagents on ammonia :
Sodium metal

[7.01] Group 15 Elements
Chapter: [7.01] Group 15 Elements
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What is the position of actinoids in periodic table ?

[8.02] F-block Elements
Chapter: [8.02] F-block Elements
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How is Methoxyethane prepared from : Diazomethane

[11.03] Ethers
Chapter: [11.03] Ethers
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How are the following compounds prepared?

Propan-1-ol from propanal

[11.01] Alcohols
Chapter: [11.01] Alcohols
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How is nitroethane converted into N-ethylhydroxylamine

[11.03] Ethers
Chapter: [11.03] Ethers
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