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Class 12th

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New answer posted

11 months ago

Class 12th Chemistry

The polymer formed on heating Novolac with formaldehyde is:
0 Follower 1 View

V
Vishal Baghel

Contributor-Level 10

Bakelite formed by the condensation reaction of phenol with formaldehyde and it is a thermosetting polymer/ plastics.

New answer posted

11 months ago

Class 12th English

Mr. John has 5 children & he gives different pocket money to all of his 5 children to do 5 particular tasks viz. going for morning walk, Exercise, Completing their home work, Drinking Milk and Assisting in family work. A particular child can do only one task at a time and each task can be assigned to one child only. (The values are in $)

Children

1

2

3

4

5

Going for

Morning Walk

35

31

44

23

36

Exercise

48

42

57

35

37

Completing their Homework

28

55

52

38

44

Drinking Milk

55

21

26

37

42

Assisting in

Family  work

26

35

34

51

47

If all the children increase the pocket money demanded by them for the tasks, then what will be the least amount for doing the task, keeping in mind that children 1, 2, 3, 4 and 5 increased the amount for the task by 50%?
0 Follower 1 View

P
Payal Gupta

Contributor-Level 10

The answer can be obtained directly by increasing the answer in question 11 by 50%, as all the Children increase the cost by 50% and hence the total cost will increase by 50% only.

New answer posted

11 months ago

Class 12th Chemistry Chemical Kinetics

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A): Heavy water is used for the study of reaction mechanism.

Reason (R): The rate of reaction for the cleavage of O-H bond is slower than that of O-D bond.

Choose the most appropriate answer from the options given below:
0 Follower 3 Views

A
alok kumar singh

Contributor-Level 10

Heavy water (D2O) is used to study reaction mechanism. O-H bond energy is less than O-D, hence it will produce fast reaction than O-D. Here assertion is true but Reason is false.

New answer posted

11 months ago

Class 12th English

Mr. John has 5 children & he gives different pocket money to all of his 5 children to do 5 particular tasks viz. going for morning walk, Exercise, Completing their home work, Drinking Milk and Assisting in family work. A particular child can do only one task at a time and each task can be assigned to one child only. (The values are in $)

Children

1

2

3

4

5

Going for

Morning Walk

35

31

44

23

36

Exercise

48

42

57

35

37

Completing their Homework

28

55

52

38

44

Drinking Milk

55

21

26

37

42

Assisting in

Family  work

26

35

34

51

47

If Mr. John has to choose 2 children to do all the work, where the first child will do the first 2 works and the remaining 3 works will be done by the other child. Then which two children will Mr. John choose so that he has to pay the least amount?
0 Follower 1 View

P
Payal Gupta

Contributor-Level 10

Note:

C1  Chosen 1 (Doing First 2 works)

C2  Chosen 2 (Doing remaining 3 works)

GM  Going for Morning walk

EX  Exercise

CH  Completing their Homework

DM  Drinking Milk

AF  Assisting in Family work

ToS  Total Cost

C1

C2

GM

EX

CH

DM

AF

ToS

1

2

35

48

55

21

35

194

1

3

35

48

52

26

34

195

1

4

35

48

38

37

51

209

1

5

35

48

44

42

47

216

2

1

31

42

28

55

26

182

3

1

44

57

28

55

26

210

4

1

23

35

28

55

26

167

5

1

36

37

28

55

26

182

2

3

31

42

52

26

34

185

2

4

31

42

38

37

51

199

2

5

31

42

44

42

47

206

3

2

44

57

55

21

35

212

4

2

23

35

55

21

35

169

5

2

36

37

55

21

35

184

3

4

44

57

38

37

51

227

3

5

44

57

44

42

47

234

4

3

23

35

52

26

34

170

5

3

36

37

52

26

34

185

4

5

23

35

44

42

47

191

5

4

36

37

38

37

51

199

Choosing Child 4 and Child 1 will be the best option for John.

New answer posted

11 months ago

Class 12th English

Mr. John has 5 children & he gives different pocket money to all of his 5 children to do 5 particular tasks viz. going for morning walk, Exercise, Completing their home work, Drinking Milk and Assisting in family work. A particular child can do only one task at a time and each task can be assigned to one child only. (The values are in $)

Children

1

2

3

4

5

Going for

Morning Walk

35

31

44

23

36

Exercise

48

42

57

35

37

Completing their Homework

28

55

52

38

44

Drinking Milk

55

21

26

37

42

Assisting in

Family  work

26

35

34

51

47

 

If no two children can work simultaneously so that each task is done one after than the other, then at most what amount will be the given to get all the tasks done? 
0 Follower 1 View

P
Payal Gupta

Contributor-Level 10

For this we need to maximize the cost each of the task, then we will find the maximum cost.

Maximum Cost = $36 (Child 5 doing Going for Morning walk) + $57 (Child 3 doing Exercise) + $55 (Child 2 doing home work) + $55 (Child 1 drink Milk) + $51 (Child 4 family work) = $254

New answer posted

11 months ago

Class 12th Chemistry Coordination Compounds

Indicate the complex / complex ion which did not show any geometrical isomerism:
0 Follower 2 Views

A
alok kumar singh

Contributor-Level 10

[ C o ( N H 3 ) 3 ( N O 2 ) 3 ] shows Facial and Meridional geometrical isomerism.

[ C o C l 2 ( e n ) 2 ] shows cis and trans geometrical isomerism.

[ C o ( N H 3 ) 4 C l 2 ] +  shows cis and trans geometrical isomerism.

[ C o ( C N ) 5 ( N C ) ] 3 − can not show geometrical isomerism.

New answer posted

11 months ago

Class 12th English

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

Mr. John has 5 children & he gives different pocket money to all of his 5 children to do 5 particular tasks viz. going for morning walk, Exercise, Completing their home work, Drinking Milk and Assisting in family work. A particular child can do only one task at a time and each task can be assigned to one child only. (The values are in $)

Children

1

2

3

4

5

Going for

Morning Walk

35

31

44

23

36

Exercise

48

42

57

35

37

Completing their Homework

28

55

52

38

44

Drinking Milk

55

21

26

37

42

Assisting in

Family  work

26

35

34

51

47

If no two children can work simultaneously so that each task is done one after than the other, then what will be the least amount a parent has to give to all the tasks done?
0 Follower 1 View

P
Payal Gupta

Contributor-Level 10

For this we need to minimize the cost for each of the task, then we will find the minimum cost.

Minimum cost = $23 (Child 4 doing Going for Morning walk) + $37 (Child 5 doing Exercise) + $28 (Child 1 doing home work) + $21 (Child 2 drink Milk) + $34 (Child 3 family work) = $143

New answer posted

11 months ago

Class 12th English

The Pie charts given below represent the market share of different chocolates in the chocolate market in the year 2020 & 2022. A new C6 has entered the market in 2022.

If the new entrant 6 has grown at the expense of C2, C3 & C5, what would be the change in the net value of sales of C4 in the year 2022, had C6  not entered the market?
0 Follower 2 Views

P
Payal Gupta

Contributor-Level 10

As we do not know that what part of the market share of C2, C3, C5 has been eaten by C5& in what proportion. So, we cannot find the answer.

New answer posted

11 months ago

Class 12th English

The Pie charts given below represent the market share of different chocolates in the chocolate market in the year 2020 & 2022. A new C6 has entered the market in 2022.

If the market grows at 10% per annum for the next two years & C4 captures one third of the new market, and also retains providing amount. What would be its market share of C4 in 2016? (approximately)
0 Follower 2 Views

P
Payal Gupta

Contributor-Level 10

Total Market in 2024 = 1.1 * 1.1 * 11520 = 14000 (approx.)

New Market = 14000 – 2480 = 1240. As C4 captures 1 3 of 2480; so the approximately share of C4 in 2024 = 28% of (11520) + 1 3  * 2480 = 4050

So, percentage share of C4 in 2024 = 405014000*100=29% (approx.)

New answer posted

11 months ago

Class 12th English

The Pie charts given below represent the market share of different chocolates in the chocolate market in the year 2020 & 2022. A new C6 has entered the market in 2022.

What is the compounded annual growth rate (CAGR) with which the market has grown for the period 2012 - 2014.
0 Follower 2 Views

P
Payal Gupta

Contributor-Level 10

11520 = 8000 (1+r)2

R=20 percent

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