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प्रश्न
Choose the correct answer from the options given below:
A compound X consists of only molecules. Hence, X will have
A. A crystalline hard structure
B. A low melting point and low boiling point
C. An ionic bond
D. A strong force of attraction between its molecules
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उत्तर
A low melting point and low boiling point
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संबंधित प्रश्न
Identify the term/substance in the following:
The electrons present in the outermost shell of an atom.
By drawing an electron dot diagram show the formation of Ammonium ion [Atomic No.: N = 7 and H = 1]
Choose the most appropriate answer of the following:
Bonding in this molecule can be understood to involve coordinate bonding
(A) Carbon tetrachloride
(B) Hydrogen
(C) Hydrogen chloride
(D) Ammonium chloride
The following table shows the test a student performed on four different aqueous solutions which are X, Y, Z and W. Based on the observations provided, identify the cation present:
| Chemical test | Observation | Conclusion |
| To solution X, ammonium hydroxide is added in minimum quantity first and then in excess |
A dirty white precipitate is formed which dissolves in excess to form a clear solution |
(1) |
| To solution Y ammonium hydroxide is added in the minimum quantity first and then in excess |
A pale blue precipitate is formed which dissolves in excess to form a clear inky blue solution. |
(2) |
| To solution W a small quantity of sodium hydroxide solution is added and then in excess. |
A white precipitate is formed which remains insoluble. |
(3) |
| To a salt Z calcium hydroxide the solution is added and then heated. |
A pungent smelling gas turning moist red litmus paper blue is obtained. |
(4) |
Why do atoms combine?
What is a lone pair of electrons?
Draw an electron dot diagram of a hydronium ion and label the lone pair of electrons.
By drawing an electron dot diagram, show the lone pair effect leading to the formation of ammonium ion from ammonia gas and hydrogen ion.
Bonding in this molecule can be understood to involve coordinate bonding.
What are the term defined below?
A bond formed by a shared pair of electrons with both electrons coming from the same atom.
