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28/06/2020

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18/11/2017

1. Among the following compounds in which case central element uses d-orbital to make bonds with attached atom
(A) BeF2 (B) XeF2 (C) SiF4 (D) BF3
2. When NH3 is treated with HCl, state of hybridisation on central nitrogen
(A) Changes from sp3 to sp2
(B) Remains unchanged
(C) Changes from sp3 to sp3d
(D) Changes from sp3 to sp
3.Which one of the following is an electron deficient compound?
(a) C2H2 (b) AlCl3 (c) H2O (d) NH3
4. In allene structure, three carbon atoms are joined by
(a) Three sigma bonds and three pi bonds
(b) Two sigma bonds and one pi-bond
(c) Two sigma bonds and two pi-bond
(d) Three pi bonds only
4.The octet rule is not valid for molecule
(a) CO2 (b) H2O (c) O2 (d) CO
5.Which of the following molecules has highest dipole moment?
(a) H2S (b) CO2 (c) CCl4 (d) BF3
6.Which of the following species is diamagnetic?
(a) (b) NO+ (c) NO
7.Intramolecular H-bonding is present in
(a) o-Nitrophenol (b) Salicylaldehyde
(c) m-Nitrophenol (d) Both (a) and (b)
8.Density of the ice is less than that of water because of
(a) extensive hydrogen bonding
(b) crystal modification of ice
(c) open porous structure of ice due to hydrogen bonding
(d) different physical states of these
9.Which of the following contains maximum number of electrons in the antibonding molecular orbitals?
(a) O2 (b) (c)
10. Which of the following species is paramagnetic?
(a) CO (b) NO (c) (d) CN
11.Bond angle is maximum for
(a) H2O (b) H2S (c) H2Se (d) H2Te
12. The geometrical arrangement of electron pairs and shape of are respectively
(a) Trigonal bipyramidal geometry, linear shape
(b) Hexagonal geometry, T-shape
(c) Triangular planar geometry, triangular shape
(d) Tetrahedral geometry, pyramidal shape

13.Which one is paramagnetic and has a bond order of 1/2?
(a) (b) (c) F2 (d)
14.In which one of the following compounds the oxidation number of oxygen is positive?
(a) H2O2 (b) Na2O2
(c) OF2 (d) H2O
15.The oxidation number of Cr in CrO5 is
(a) +3 (b) +5 (c) +6 (d) 0
16.On the basis of composition, the oxidation numbers of iron in Fe3O4 is / are
(a) +2 and +3 (b) +1 and +2
(c) +2 only (d) +3 only
17. Which of the following represents a redox reaction?
(a) NaOH + HCl  NaCl + H2O
(b) BaCl2 + H2SO4  BaSO4 + 2HCl
(c) CuSO4 + 2H2O  Cu(OH)2 + H2SO4
(d) Zn + HCl  ZnCl2 + H2
18.In which of the following compounds, nitrogen has an oxidation state of 1?
(a) N2O (b)
(c) NH2OH (d) N2H4
19.Which of the following acts as an oxidizing agent?
(a) HNO3 (b) Cl2
(c) FeCl3 (d) All the three
20.The compound that can work both as an oxidizing as well as reducing agent is
(a) KMnO4 (b) H2O2
(c) Fe2(SO4)3 (d) K2Cr2O7

1.Solution:
In XeF2. Xe atom has sp3d hybridization. Hence (B) is correct.
2.Solution:
On NH4+ state of hybridisation on central nitrogen atom is sp3 as in NH3.

16/11/2017

Good News for NEET Aspirants!
(1) The National Testing Agency (NTA) will now be responsible for conducting various National Level Entrance Examinations going forward, thus relieving the CBSE from its current responsibility of carrying out NEET UG, UGC NET, etc.
(2) The National Testing Agency aims to conduct these entrance exams twice a year as compared to the current scenario where NEET UG is conducted just once a year. It will relieve the mounting pressure on students to either clear the exams or wait for another year.
(3) Under the NTA, the entrance examinations will be conducted online at least twice a year. The agency will also bring in high reliability, standardized difficulty level to assess the aptitude, intelligence and problem-solving abilities of the students.
***** In the light of these recent developments it is obvious that the pattern of question paper is likely to be drastically changed, as it will aim to test your intelligence, aptitude and skill. Depending only on class books for competition now becomes a risk. You are advised to acquire deep knowledge from suitable text books meant for competition. Complete NCERT books in six month and then use other books and question books to succeed.

Home Tuition available in kozhikkode district.Special package for Gulf students.+1,+2 Entrance Oriented9946308396
02/07/2017

Home Tuition available in kozhikkode district.
Special package for Gulf students.
+1,+2 Entrance Oriented
9946308396

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Kozhikode

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+919946308396

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