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Carbon, diamond and graphite are together called:
A
Allotrope
B
Isomers
C
Isomorphs
D
Isotopes
Correct Answer:
Allotrope
Carbon, diamond and graphite are together called Allotrope.
City High School must put together a debating team consisting of four debaters.There are candidates of equal ability : X,Y and Z who are all seniors; and A,B,C and D who are all juniors..The school requires that there should be two seniors and two juniors in the team.It is also necessary that all of the debaters be able to work with one another. *Debaters Y and A cannot work together. *Debaters Z and C cannot work together. *Debaters A and B cannot work together. which of the following statements must be false? 1.Debaters Y and C are never selected together. 2.Debaters Z and D are never selected together. 3.Debaters Z and D are never selected together.
A
Only I
B
Only II
C
Only III
D
All of these
The value ∆H transition of C (graphite) → C (diamond) is 1.9 kJ/mol at 25℃ entropy of graphite is higher than entropy of diamond. This implies that?
A
C(diamond) is more thermodynamically stable then C (graphite) at 25℃
B
C(graphite) is more thermodynamically stable than C (diamond) at 25℃
Working together B and C take 50% more number of days than A, B and C together take and A and B working together, take $$\frac{8}{3}$$ more number of days than A, B and C take together. If A, B and C all have worked together till the completion of the work and B has received Rs. 120 out of total earnings of Rs. 450, then in how many days did A, B and C together complete the whole work?
A
2 days
B
4 days
C
6 days
D
8 days
E
10 days
Price of a diamond is directly proportional to square of its weight. A man broke the diamond accidently in three pieces in the ratio of 3 : 5 : 7 and thusloses Rs 42600. What was the original price (in Rs) of the diamond?
A
11786
B
60000
C
67500
D
75000
Read the following information carefully and answer the questions given below it. There are five men A,B,C,D and E and six women P, Q, R, S, T and U. A, B and R are advocates, C, D, P, Q and S are doctors and the rest are teachers. Some teams are to be selected from amongst these eleven persons subject to the following conditions. A, P and U have to be together. B cannot go with D or R. E and Q have to be together. C and T have to be together. D and P cannot go together. C cannot go with Q. If the team is to consist of two male advocates, two lady doctors and one teacher, the members of team are
A
A, P, R, S, U
B
A, B, P, Q, U
C
B, E, Q, R, S
D
A, B, P, U, S
An Fe/graphite diffusion couple is annealed at 1273 K. The carbon content (in mass %) on the Fe side of the Fe/graphite diffusion couple will be close to
A
0.5
B
1
C
1.6
D
6.7
কার্বন মৌল হীরা ও গ্রাফাইট-এ ভিন্নরূপ। এদের ক্ষেত্রে কোন উক্তিটি সত্য নয়? (Diamond and graphite are the allotropes of carbon. For them. which of the following statements is incorrect?
A
উভয়েই কার্বন মৌল দ্বারা গঠিত। (Both of them are made of carbon.)
B
হীরা ও গ্রাফাইটে কার্বন পরমাণুর সংকরায়ন হলো যথাক্রমে sp3 ও sp2 (Hybridization of carbon atom in diamond and graphite are sp3 and sp2, respectively.)
C
উভয়ের দহন তাপ একই। (Both of them possesses the same heat of combustion.)
D
উভয়ের বিদ্যুৎ পরিবাহিতা ভিন্ন। Both of them possesses different electrical conductivity.)
কার্বন মৌল হীরা ও গ্রাফাইট -এ ভিন্নরূপ। এদের ক্ষেত্রে কোন উক্তিটি সত্য নয়? (Diamond and graphite are the allotropes of carbon. For them, which of the following statements is incorrect?)
A
উভয়েই কার্বন মৌল দ্বারা গঠিত। (Both of them are made of carbon )
B
হীরা ও গ্রাফাইটে কার্বন পরমাণুর সংকরায়ন হলো যথাক্রমে sp3 ও sp2। (Hybridization of carbon atom in diamond and graphite are sp3 and sp2, respectively.)
C
উভয়ের দহন তাপ একই (Both of them possesses the same heat of combustion)
D
উভয়ের বিদ্যুৎ পরিবাহিতা ভিন্ন। (Both of them possesses different electrical conductivity)
City High School must put together a debating team consisting of four debaters.There are candidates of equal ability : X,Y and Z who are all seniors; and A,B,C and D who are all juniors..The school requires that there should be two seniors and two juniors in the team.It is also necessary that all of the debaters be able to work with one another. *Debaters Y and A cannot work together. *Debaters Z and C cannot work together. *Debaters A and B cannot work together. If debater B is selected and debater Y is rejected,the team will consist of which foursome?
A
X,Z,A and B
B
X,Z,D and ?B
C
X,Z,C and B
D
None of these
City High School must put together a debating team consisting of four debaters.There are candidates of equal ability : X,Y and Z who are all seniors; and A,B,C and D who are all juniors..The school requires that there should be two seniors and two juniors in the team.It is also necessary that all of the debaters be able to work with one another. *Debaters Y and A cannot work together. *Debaters Z and C cannot work together. *Debaters A and B cannot work together. If both Y and Z are selected, which of the other debaters must be in the team as well ?
A
Both C and D
B
Only D
C
Both B and A
D
Both B and D