Covalent Bond
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- 1g of O atom
- 1 g of
molecule
- 1 g of
molecule
- +3.4 eV
- +6.8 eV
- −13.6 eV
- +13.6 eV
- PH3
- BeCl2
- H2O
- SO2
What is the difference between covalent bond and hydrogen bond?
(i)
Elements X, Y and Z have 4, 5 and 7 valence electrons respectively.
Write the molecular formula of the compounds formed by the elements individually with hydrogen.
(ii) Which of these compounds will have highest dipole moment?
50 %
43 %
72.24%
55.3 %
What is lowest energy structure, in terms of formal charge?
- Free radicals
- Carbocation
- Carbanion
- Both A & B
- H2O2
- BaO2
- OF2
- H2S2O8
Which of the following solid is isotropic?
Molecular
Metallic
Amorphous
Ionic
Reason (R): Silicon are organosilicon polymers, which have (−R2SiO−) as repeating unit.
- Both A and R are correct and R is the correct explanation of A.
- Both A and R are correct and R is not the correct explanation of A.
- A is not correct but R is correct.
- Both A and R are not correct
A Gallium has higher ionization enthalpy than Aluminium.
B Boron does not exist as \(B^{3+}\) ion
C Aluminium forms \([AlF_6]^{3-}\)- ion but Boron does not form \([BF_6]^{3-}\)- ion.
D \(PbX_2\) is more stable than \(PbX_4\).
E \(Pb^{4+}\) acts as an oxidizing agent but \(Sn^{2+}\) acts as a reducing agent.
F Electron gain enthalpy of chlorine is more negative as compared to fluorine.
G \(Tl (NO_3)_3\) acts as an oxidizing agent.
H Carbon shows catenation property but lead does not.
I \(BF_3\) does not hydrolyze.
J Why does the element silicon not form a graphite-like structure whereas carbon does.
CH3CHO, CH3CH2OH, CH3OCH3, CH3CH2CH3
- Natural rubber
- Polystyrene
- Teflon
- Nylon-6, 6
- 6
- 8
- 12
- 4
(b) calcium oxide.
What are triple covalent bonds ?
- Na2[NiCl4]
- K2[Ni(CN)4]
- NiCl2.6H2O
- [Ni(CO)4]
- Hydrogen ion, H+, exists freely in solution.
- Hydrogen has three isotopes of which protium is the most common.
- Hydrogen never acts as cation in ionic salts.
- Dihydrogen does not act as a reducing agent.
Which of the following elements can show covalencey greater than 4?
(a) Be (b) P (c) S (d) B
Question 17
The electronic configurations of the elements A, B and C are given below. Answer the question on the basis of these configurations.
A 1s2 2s2 2p6
B 1s2 2s2 2p6 3s2 3p3
C 1s2 2p6 2p6 3s2 3p5
The bond between B and C will be
(a) ionic
(b) covalent
(c) hydrogen
(d) coordinate
Aspartame is a non-nutritive sweetner . Assuming that both amide and ester bonds are hydrolyzed in the stomach, the amino acid obtained is
- BOTH (A) AND (c)
- none of these
- 83
- 50
- zero
- 17
Draw the electron dot structure for .
Reason: Six F atoms in SF6 prevent the attack of H2O on sulphur atom of SF6.
- Both assertion and reason are correct statements, and reason is the correct explanation of the assertion
- Both assertion and reason are wrong statements.
- Assertion is wrong but reason is correct statement
- Both assertion and reason are correct statements, but reason is not the correct explanation of the assertion.
- Assertion is correct but reason is wrong statement.