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CBSE Class 12-science Answered

half life of a radioactive particle is 1 second. The rate of dissociation of A is 1000 per second . Then after 3 second , A will be ?

Asked by Atulcaald | 31 May, 2018, 09:49: PM

Expert Answer

begin mathsize 18px style By space using comma straight A equals straight A subscript 0 open parentheses 1 half close parentheses to the power of straight t over straight T subscript begin display style bevelled 1 half end style end subscript end exponent space straight A over straight A subscript 0 space equals open parentheses 1 half close parentheses to the power of straight t over straight T subscript begin display style bevelled 1 half end style end subscript end exponent space straight A over straight A subscript 0 space equals open parentheses 1 half close parentheses to the power of 3 over 1 end exponent space equals space open parentheses 1 half close parentheses cubed space equals space 1 over 8 end style

Answered by Ramandeep | 08 Jun, 2018, 04:25: PM

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CBSE 12-science - Chemistry

xKIO, +yKI+zHCl → alCl+bKCl+cHâO (Balanced equation) x, y, z, a, b & c are coefficients in balanced equation (A) sum of coefficients x, y & z is 9 (B) sum of coefficients x, y & z is 7 (C) sum of coefficients a, b & c is 9 (D sum of coefficients a, b & c is 7

Asked by keshrianuska | 24 May, 2023, 12:40: AM

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CBSE 12-science - Chemistry

buten-2-al or but-2-enal Which one is correct ? (Organic Chemistry)

Asked by chiragd2706 | 11 Apr, 2023, 01:57: PM

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CBSE 12-science - Chemistry

1. Which of the following is the most stable complex species? (a) [Fe(C2O4)3]3- (b) [Fe(CN)6]3- (c) [Fe(CO)5] (d) [Fe(H2O)6]3+

Asked by paresh0311 | 01 Mar, 2023, 12:36: PM

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CBSE 12-science - Chemistry

Please answer fast Assertion (A): Zinc is not regarded as a transition element. Reason (R): In zinc, 3d orbitals are completely filled in its ground state as well as in its oxidised state. Select the correct answer to these questions from the codes (a), (b), (c) and (d) an given below. (a) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A). (b) Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A). (c) Assertion (A) is true, but Reason (R) is false. (d) Assertion (A) is false, but Reason (R) is true.

Asked by sagarmishra | 01 Mar, 2023, 12:33: PM

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CBSE 12-science - Chemistry

Please answer Q.17 from board paper. Assertion (A): Nucleophilic substitution of iodoethane is easier than chloroethane. Reason (R): Bond energy of C — CI bond is less than C — I bond.

Asked by anubhutiupadhaya | 01 Mar, 2023, 12:30: PM

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CBSE 12-science - Chemistry

Please answer this: Give reasons for the following: (a) Carboxylic carbon is less electrophilic than Carbonyl carbon of aldehydes and ketones. (b) Propanal is more reactive than Propanone towards addition of HCN.

Asked by jayeshsah1995 | 01 Mar, 2023, 12:14: PM

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CBSE 12-science - Chemistry

Please answer fast. Write the equations involved in the presentation of KMnO4 from Pyrolusite ore

Asked by varma.renu9481 | 01 Mar, 2023, 12:09: PM

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CBSE 12-science - Chemistry

what is titration

Asked by elabarman58 | 23 Jan, 2023, 09:39: AM

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CBSE 12-science - Chemistry

what is titration

Asked by elabarman58 | 23 Jan, 2023, 09:38: AM

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CBSE 12-science - Chemistry

Amines are basic substance while amides are neutral

Asked by kaushiksahil779 | 19 Jan, 2023, 08:55: PM

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