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Official Class XII Preparation

(211 Posts)

This thread is dedicated to preparation for Class XII exams. You may share questions from any of the subjects like Mathematics, Science and Business Studies.

Question should not exceed 100 characters.Use add options for multiple choice questions and "Uploadimage/Add related data" for passage text papers.
Question should be at least 10 characters long.
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Shreyansh Sisodia
Posted on 04 Jul, 2019 9:44 PM

What's about physics of class 12th

Please type your answer before submitting.
Papiya Das
Shared from The Harappan Civilization - I on 02 Jun, 2019 11:03 PM

Which of the following statements is/are incorrect?

a. The citadel of Lothal was built at a height and was fortified with baked or sunbaked bricks.
b. The houses at Lothal were built of mud bricks, drains were made of burnt bricks.
c. The number of wells in Lothal was about 700.

 
a, b and c
b and c
a and c
a and b
only b
Please type your answer before submitting.
Papiya Das
Posted on 02 Jun, 2019 11:03 PM

Wrong answer is mentioned

Ankit Sarkar
Shared from p-Block Elements - 1 on 06 Jan, 2019 11:50 AM

The toxic element of Boron family is

 
B
In
Tl
Ga
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Ankit Sarkar
Posted on 06 Jan, 2019 11:50 AM

Q

Balaji Vanapalli
Shared from Electrochemistry - II (Class XII) on 30 Nov, 2018 9:16 PM

On the basis of the information available from the reaction: 4Al + 3O2 2Al2O3; G = - 827 kJ mole-1 of O2, the minimum emf required to carry out electrolysis of Al2O3 is (1 F = 96500 C)

 
2.14 V
4.28 V
6.42 V
8.56 V
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Balaji Vanapalli
Posted on 30 Nov, 2018 9:16 PM

Why 3/2 is taken

Simran Kapure
Shared from Haloalkanes on 04 Nov, 2018 1:00 PM

Alkyl bromides are prepared by the following reaction:

C2H5OH + KBr + HBr C2H5Br + KHSO4 + H2O

The mixture of KBr and H
2SO4 is not used for secondary and tertiary alcohols because

 
secondary and tertiary alcohols do not undergo nucleophilic substitution readily
the reaction becomes non-spontaneous
the carbocation formation cannot take place
2o and 3o alcohols will undergo dehydration to form alkenes
Please type your answer before submitting.
Simran Kapure
Posted on 04 Nov, 2018 1:00 PM

C2H5OH KBr H2SO4 ------> C2H5Br KHSO4 H2O Its following reaction is correct