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Syllabus
Q. Element A has 2 electron in its M shell. Element B has atomic number 7.
(a) Write equations to show how A and B form ions.
(b) If B is a diatomic gas, write the equation for the direct combination of A and B to form a compound.
(c) If the compound formed between A and B is melted and an electric current is passed through the molten compound, the element A will be obtained at the ....... and B at the ......... of the electrolytic.
Electrovalent compounds are soluble in water, insoluble in organic solvents, good conductors of electricity in molten or aq. solution state, have high melting points and undergo electrolytic dissociation on passage of electric current, while covalent compounds are soluble in organic solvents insoluble in water, non-conductors of electricity, have low melting points & undergo ionisation on passage of electric current.
(a) (i) In covalent compounds, the bond is formed due to ............. [sharing/transfer] of electrons.
(ii) Electrovalent compounds have a ................ [low/high] boiling point.
(iii) A molecule of .............. contains a triple bond. [hydrogen, ammonia, nitrogen].
(b) By drawing an electron dot diagram, show the lone pair effect leading to the formation of — ammonium ion from ammonia gas and hydrogen ion.
(c) Give reasons — Hydrogen chloride can be termed as a polar covalent compound.
Q. Complete the following:
(a) When the nuclei of two different reacting atoms are of......... mass, then a bond so formed is called ..... covalent bond (equal, unequal, polar, non-polar).
(b) In case of non-polar covalent bond, the covalent bond is formed in the ......... of atoms and shared
electrons are ........ distributed (corner, middle, equally, unequally).
(c) The ions in .............compounds are held very strongly due to strong .................. forces
(electrovalent, covalent, electromagnetic,
electrostatic).
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18. Explain the terms a] Lone pair of electrons b] Coordinate bond. Explain diagrammatically the lone pair effect of:
a] The nitrogen atom of the ammonia molecule leading to the formation of ammonium ions
b] The oxygen atom of the H2O molecule leading to formation of hydronium & hydroxyl ions
W=2,8,1
X=2,8,7
Y=2,5
Z=1
i) What type of bond is between a)W&X b)Y&Z
ii)What is the formula of the compound formed between a)X&Z b)W&X
A.Oxidation
B.Reduction
C.Redox
D.Displacement
A) Carbon tetrachloride,
B) Hydrogen,
C) Hydrogen Chloride,
D) Ammonium Chloride
Plzz explain the answer also.
Write the electron dot structure of the following
i) H3O+
ii) NH4+
Give reasons for the following:
l. NH3 gas a covalent compound does not conduct electricity but its aq. soln. NH40H is a weak
electrolyte.
2. MgCl2 is soluble in water but insoluble in acetone, while methane is insoluble in water, but soluble in acetone.
3. Iron displaces copper from a solution of a copper salt. The reaction is deemed as a redox reaction
A non-metallic atom [at. no. 9] forms a molecule of the same,containing a single covalent bond.
In the formation of MgO the magnesium atom [at no. 12] loses two electrons from its valence shell.
1) When L is heated with a iron metal ,it forms a compound FeL.What chemica term would you use to describe the change undergone by L
Q3. Iron displaces copper from a solution of a copper salt. The reaction is deemed as a redox reaction.
Q4. A non-metallic atom [at. no.9] forms a molecule of the same, containing a single covalent bond.
Q5. In the formation of MgO the magnesian atom [at. no.12] loses two electrons from its valence shell.
Why non polar covalent compound are insoluable in water .give reason
Please give the ans
Could you please explain how to balance a chemical equation using partial equation method? Also, if you could specifically explain how the given equation is to be split.
Thanks