Class 12th
Get insights from 12k questions on Class 12th, answered by students, alumni, and experts. You may also ask and answer any question you like about Class 12th
Follow Ask QuestionQuestions
Discussions
Active Users
Followers
New answer posted
2 months agoContributor-Level 10
Given the equations:
t? (A + 2B) = -1 which expands to t? (A) + 2t? (B) = -1 . (I)
t? (2A - B) = 3 which expands to 2t? (A) - t? (B) = 3 . (II)
Solving equations (I) and (II) simultaneously, we get:
t? (A) = 1
t? (B) = -1
Therefore, t? (A) - t? (B) = 1 - (-1) = 2.
New answer posted
2 months agoContributor-Level 10
Haematite: Fe? O?
Bauxite: Al? O? ·xH? O
Magnetite: Fe? O?
Malachite: CuCO? ·Cu (OH)?
New answer posted
2 months agoContributor-Level 9
Matching Calcium Compounds to their Description:
o Ca (OCl)? : Bleach
o CaSO? • ½ H? O: Plaster of paris
o CaO: Component of cement
o CaCO? : Antacid
New answer posted
2 months agoContributor-Level 9
Reaction Sequence:
o NO? + CH? COOH → HNO? + CH? COO?
o Sulphanilic acid (+ NH? CH? COO? ) + HNO? → N-acetylated diazonium intermediate + 2H? O
The intermediate + another molecule → Red Azodye + NH? + CH? COOH
New answer posted
2 months agoContributor-Level 10
Unimolecular Reactions might seem to not participate in the collision theory due to the presence of only a single molecule. In such cases, the molecule is activated by external forces such as heat, light, electricity, or by colliding with the walls of the container. This force charges the molecule enough to break the activation barrier and result in an effective collision.
New answer posted
2 months agoContributor-Level 9
Potential difference across resistor at time t = V = 30/3 = 10V
Current, I = 10 / (5 * 10? ) = 2? A
New answer posted
2 months agoContributor-Level 10
100 mol of KBr is doped with 10? mol of SrBr?
Therefore, 1 mol of KBr contains 10? mol of SrBr?
Molar mass of KBr = 119 g/mol .
119 g of KBr contains 10? mol of SrBr?
1 g of KBr contains (10? / 119) mol of SrBr?
Each Sr²? ion introduced creates one cation vacancy to maintain electrical neutrality.
Number of cation vacancies = (moles of SrBr? ) * (Avogadro's number)
Number of vacancies = (10? / 119) * (6.023 * 10²³) = 5.06 * 10¹?
The answer provided in the document is "5 (Rounded off)", which likely refers to the coefficient 5.06.
New answer posted
2 months agoContributor-Level 10
The reaction is N? O? (g)? 2NO? (g).
Δn_g = (moles of gaseous products) - (moles of gaseous reactants) = 2 - 1 = 1.
The relationship between Kp and Kc is Kp = Kc (RT)^Δn_g.
600.1 = 20.4 * (0.0831 * T)¹
T = 600.1 / (20.4 * 0.0831) = 353.99 K.
The answer, rounded off, is 354 K.
Taking an Exam? Selecting a College?
Get authentic answers from experts, students and alumni that you won't find anywhere else
Sign Up on ShikshaOn Shiksha, get access to
- 65k Colleges
- 1.2k Exams
- 679k Reviews
- 1800k Answers