Chemistry (Coordination Compounds)
12th CBSE Question Paper
One marks Questions
Q.1 What
is the coordination number of metal ion in
[Fe(C2O4)3]3-
Q.2 Give an example of linkage isomerism.
Q.3 How
if the magnitude of CFSE affected by nature of
legend and oxidation state of
metal ion?
Q.4 Illustrate
with example ionization isomerism in
coordination compounds.
Two marks Questions
Q.5
Write the isomers, name of isomerism and IUPAC
name
of one of isomer of [Cr(NH3)4Cl2]+
Q.6 Write
the chemical formula of following:
(i) Hexaammineplatinum (ii) chloride (iii)
tetraamminedichloridocobalt (iv) ion
Q.7 Write
the IUPAC name of following complexes:
(i) [Ni(H2O)6](ClO4)2 (ii)
[Co(NH3)5NO2]+2 (iii)
[Pt(NH3)4Cl2]Cl2 (iv) Na3[Cr(OH)2F4]
Three marks Questions
Q.8 Using
the valance bond theory explain the geometry and
magnetic nature of [Co(NH3)6]3+
Q.9 Write
the IUPAC name and possible optical isomers of
[CrCl3(en)(NH3)2]+
Q.10 Compare
the magnetic behavior of [Fe(CN)6]4- and
[FeF6]3-
Q.11 (i)
On the basis of CFT write the electronic configuration of d4 ion if CFSE is
less than pairing energy.
(ii)
Write the structure and name of all stereoisomers of the following:
(a)
[Co(en)3]Cl3 (b) [Fe(NH3)4Cl2]Cl
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Evolution of Quantum Concept
In 1922, Niels Bohr won the Nobel Prize for Physics. He won it “for his services in the investigation of the structure of atoms and of the radiation emanating from them.” Naturally then, his Nobel Lecture, which he delivered on December 11, 1922, discussed the field of physics to which his work belonged. His lecture was titled “The structure of the atom.” He therefore spoke about the structure of the atom and how he had been able to modify the planetary model of Ernest Rutherford to account for the hydrogen spectrum. By doing this, he had become the first to apply the quantum concept, which restricts the energy of a system to certain discrete values, to the problem of atomic and molecular structure.
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Indications of New Physics
Indications of New Physics in European Organisation (CERN)
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Need of Skill & Coaching
There are lot of students who decide to pursue their further studies in science field. They many opt for engineering or medical stream. However, to be successful in any of the streams, it is very important that students have good understanding about the fundamental concepts of the subjects.
Some schools appoint good and learned faculty or teachers to teach students. Such teachers work really hard to make sure that each student has grasped the concept well. However, not all the educational institutes lay that much emphasis on hiring qualified and learned teaching staff. In such scenarios, students should join science coaching classes at very initial stage itself.
It is suggested that student joins science coaching as early as possible so that he/she gets adequate time to understand, learn and improve his/her skills. It requires lots of practice to understand the concepts of science. Therefore, it will be beneficial for students if they get adequate time to practice.
Science
coaching classes emphasize on teaching the fundamental concepts in
the best possible way. They hire highly qualified faculties to teach
students. They also conduct assessments on regular basis which are
helpful in tracking the students
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SCIENCE COACHING INDIA
Science Coaching India explore, how can Talent Search Examinations help Students ?
The Strategy for Talent Search:
Ambitious XII Appeared / Pass Students, generally have reasonable understanding of most concepts but they do not have perfection in applying these concepts to solve examination-based problems. Even among extremely well prepared & deserving Students, a large percentage fail due to lack of proper Examination Temperament.
This will help them to know what they can achieve & how they came bridge the gap between their desire and aspiration. Based on their answers, Students will get suggestions to plug loopholes to perform to their optimum.
Preparing well for a particular Examination is one thing and transforming the knowledge & skills into success on the Examination day is another. Many Students are not able to adopt the right approach and proper examination temperament as they do not have the right feedback on their preparation.
This strategy help students to analyze & realize causes of failure in Examination and provide opportunity to learn from the experience of the successful Students and teach you how not to fail in Examination. This strategy will also boost your motivation & help you choose the right study material, books & provide assistance for preparation. If you take this seriously, you will learn what you need to do to succeed & get a good Rank in Examination.
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Science skilling of India
PSLV all set to ferry 31 satellites on January 12 by Cartosat-2F aimed at surveillance will be main payload. Among the world’s favourite and reliable commercial launchers for small satellites, the upcoming 42nd PSLV will carry a total of 31 satellites including 28 paid riders. The main payload, the 710-kg Cartosat-2F, is the seventh in the Cartosat-2 series and is built to work for five years. ISRO is putting up two of its own small satellites — a 100 kg micro satellite and the 11-kg nano satellite INS-1C. There are also 28 smaller customers.The commercial satellites include three 100-kg class micro satellites and 25 nanosats (1-10 kg) from Canada, Finland, France, Korea the U.K. and the U.S.The PSLV has so far launched 209 small and medium satellites for foreign countries and earned revenue for the commercial arm, Antrix Corporation Ltd. ISRO will be trying a two-orbit feat with the PSLV for the second time. On Friday, just after 17 minutes from take-off, the main satellite will be released first into a 505-km orbit, followed by 29 others. Almost 1.5 hours later, microsat will be released into a lower 359 km orbit. Between the two orbits, the engine in the fourth stage of the rocket will be re-started twice during the course. The flight lasting 2 hours and 21 minutes will be the longest of the PSLV, about six minutes longer than C-35 which was launched in September 2016.
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Solid Chemistry
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Surface chemistry
12th CBSE Question Paper (Topic:
Surface Chemistry)
One marks Questions
Q.1 Define
Electrophoresis.
Q.2 Why
is adsorption always exothermic
Q.3 What
is emulsion?
Q.4 Write
the reason for stability of sols.
Q.5 In
what way is a sol different from gel?
Q.6 How
does soap help in washing clothes?
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