Chemistry
Get insights from 6.9k questions on Chemistry, answered by students, alumni, and experts. You may also ask and answer any question you like about Chemistry
Follow Ask QuestionQuestions
Discussions
Active Users
Followers
New answer posted
a year agoContributor-Level 10
3.38. In a period, metallic character decreases as we move from left to right. Therefore, metallic character of K, Mg and Al decreases in the order: K > Mg > Al. However, within a group, the metallic character, increases from top to bottom. Thus, Al is more metallic than B. Therefore, the correct sequence of decreasing metallic character is: K > Mg > Al > B, i.e., option (d) is correct
New answer posted
a year agoContributor-Level 10
1.43 There is one octahedral hole for each atom in hexagonal close packed arrangement. If the number of oxide ions (O2−) per unit cell is 1, then the number of
New answer posted
a year agoContributor-Level 10
Step 1. Write the structure of the products side by side with their oxygen atoms pointing towards each other.
New question posted
a year agoNew answer posted
a year agoContributor-Level 10
1.42 The ratio less than 2:1 in Cu2O shows that some cuprous (Cu+) ions have been replaced by cupric (Cu+2) ions. To maintain electrical neutrality, every two Cu+ ions will be replaced by one Cu+2 ion, thereby creating a hole. As conduction will be due to the presence of these positive holes, hence it is a p -type semi conductor
New answer posted
a year agoContributor-Level 10
1.41 These solids have conductive in the intermediate range from 10−6 to 104ohm−1m−1. As there is rise in
the temperature, conductivity also increases because electrons from the valence band jump to
conduction band.
Types of semiconductors
(a) n - type semiconductor when silicon or germanium crystal is doped with group 15 element like P or
As, the dopant atom forms four covalent bonds like a Si or Ge atom but the fifth electron no used in
bonding, becomes delocalised and contribute its share towards electrical conduction. Thus, silicon or
germanium doped with P or As is called n-type semiconductor (negative
New answer posted
a year ago
Contributor-Level 10
(a) 2-Methykbuut-2-ene
(b) Pent-1-ene-3-yne
(c) But-1,3-diene
(d) 4-Phenylbut-1-ene
(e) 2-Methyl phenol (f) 5- (2-Methylpropyl)decane
(g) 4-Ethyldeca-1,5,8-triene
New answer posted
a year agoContributor-Level 10
Chlorination of methane is a free radical reaction which occurs by the following mechanism involving initiation, propagation and termination steps:
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
- 67k Colleges
- 1.2k Exams
- 718k Reviews
- 1850k Answers