Class 12th

Directions for questions: Answer the questions on the basis of the information given below:

Sanskaram Karoti (SK) is a spiritual organisation involved in performing spiritual rites. Currently it has 37 volunteers. They are involved in three jobs : Meditation , Yoga and Pooja. Each volunteer working with Sanskaram Karoti (SK) has to be involved in at least one of the three jobs mentioned above.

• A maximum number of volunteers are involved in Yoga. Among them, the number of volunteers involved in Yoga alone is equal to the volunteers having additional involvement in the Pooja.

• The number of volunteers involved in Pooja alone is

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Payal Gupta

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Which one of the following compounds is aromatic in nature?

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Contributor-Level 10

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Answer the questions on the basis of the information given below.

Four houses Bachan, Khan, Chaudhary and Sharma are located in a row in the given order. Each of the houses is occupied by a person earning a fixed amount of a salary. The four persons are Powell, Kartik, Leo, and Samay.

Rea the following instruction carefully:

I. Powell lives between Samay and Kartik

II. Leo does not stay in Bachan house

III. The person living in Chaudhary house earns more than that of person living in Bachan

IV. Salary of Samay is more than that of Powell but lesser than that of Kartik

V. One of the person earns Rs. 80000

VI. The person earning Rs. 1100

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Contributor-Level 10

Name	Blue	Green	Red	Yellow	Salary
Paul	*	?	*	*	30
Krishna	*	*	?	*	110
Laxman	*	*	*	?	50
Som	?	*	*	*	80

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In the following sequence of reactions a compound A, (molecular formula C₆H₁₂O₂) with a straight chain structure gives a C4 caboxylic acid. A is

$A \to_{H_{3} O^{+}}^{L i A I H_{4}} B \to_{}^{O x i d a t i o n} C_{4} - c a r b o x y l i c a c i d$

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Contributor-Level 10

Here A is CH₃ - CH₂ – CH₂ – COO – CH₂ – CH₃

The given sequence of reaction is:

$C H_{3} - C H_{2} - C H_{2} - C H_{2} - O H \to_{}^{O x i d a t i o n} C H_{3} - C H_{2} - C H_{2} - C O O H$

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Which one of the following gives the most stable Diazonium salt?

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Contributor-Level 10

Only 1° aromatic amines give stable diazonium salt on reaction with nitrous acid

Here 1° aromatic amine is which gives most stable diazonium salt

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Answer the questions on the basis of the information given below.

Rea the following instruction carefully:

I. Powell lives between Samay and Kartik

II. Leo does not stay in Bachan house

III. The person living in Chaudhary house earns more than that of person living in Bachan

IV. Salary of Samay is more than that of Powell but lesser than that of Kartik

V. One of the person earns Rs. 80000

VI. The person earning Rs. 1100

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Contributor-Level 10

Name	Blue	Green	Red	Yellow	Salary
Paul	*	?	*	*	30
Krishna	*	*	?	*	110
Laxman	*	*	*	?	50
Som	?	*	*	*	80

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11 months ago

Identify A in the following reaction

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Class 12th Atomic Masses and Composition of Nucleus

Contributor-Level 10

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11 months ago

How does the number of neutrons affect the stability of a nucleus?

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Jaya Sharma

Contributor-Level 10

The number of neutrons in nucleus has an important role in determining the stability of nucleus. Stability of nucleus is affected by the balance between number of protons and neutrons and the number of nucleons. In lighter elements, the most stable nuclei has roughly equal number of protons and neutrons. For instance, Carbon-12 is the most common isotope of carbon with 6 protons and 6 neutrons.

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11 months ago

cas C,ad v,mad v,aDcA

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New question posted

11 months ago

Answer the questions on the basis of the information given below.

The regular mathematics faculty could not teach because of being sick. As a stop gap arrangement different visiting faculty taught different topics on 4 different days in a week. The scheduled time for class was 7:00 am with maximum permissible delay of 20 minutes. The monsoon made the city bus schedules erratic and therefore the classes started on different times on different days.

Mr. Singh didn’t teach on Thursday. Calculus was taught in the class that started at 7:20 am. Mr. Chatterjee took the class on Wednesday, but he didn’t teach probability. The clas