Chemistry
The following table represent the elements and the atomic number.
With reference to this, answer the following using only the alphabets given in the table.
| Element | Atomic number |
|---|---|
| P | 13 |
| Q | 7 |
| R | 10 |
(i) Which element combines with hydrogen to form a basic gas?
(ii) Which element has an electron affinity zero?
(iii) Name the element, which forms an ionic compound with chlorine.
Chemical Bonding
ICSE 2020
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Answer
(i) Q combines with hydrogen to form a basic gas.
(ii) R has electron affinity zero as it's octet is complete and it is a stable element.
(iii) P forms an ionic compound with chlorine as it has +3 valency.
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Related Questions
Give one word or a phrase for the following statements:
(i) The chemical bond formed by a shared pair of electrons, each bonding atom contributing one electron to the pair.
(ii) Electrode used as cathode in electrorefining of impure copper.
(iii) The substance prepared by adding other metals to a base metal in appropriate proportions to obtain certain desirable properties.
(iv) The tendency of an atom to attract electrons to itself when combined in a compound.
(v) The reaction in which carboxylic acid reacts with alcohol in the presence of conc. H2SO4 to form a substance having a fruity smell.
Fill in the blanks from the choices given in brackets:
(i) The polar covalent compound in gaseous state that does not conduct electricity is ……………
(carbon tetra chloride, ammonia, methane)
(ii) A salt prepared by displacement reaction is ……………
(ferric chloride, ferrous chloride, silver chloride)
(iii) The number of moles in 11gm of nitrogen gas is ……………
(0.39, 0.49, 0.29) [atomic mass of N=14]
(iv) An alkali which completely dissociates into ions is ……………
(ammonium hydroxide, calcium hydroxide, lithium hydroxide)
(v) An alloy used to make statues is ……………
(bronze, brass, fuse metal)
Draw the electron dot diagram for the compounds given. Represent the electrons by [.] and [x] in the diagram.
[Ca=20, O=8, Cl=17, H=1]
(i) Calcium oxide
(ii) Chlorine molecule
(iii) Water molecule
Choose the correct word which refers to the process of electrolysis from A to E, to match the description (i) to (iv): A: Oxidation, B: Cathode, C: Anode , D: An electrolyte , E : Reduction
(i) Conducts electricity in aq. or in molten state.
(ii) Loss of electrons takes place at anode.
(iii) A reducing electrode
(iv) Electrode connected to the positive end or terminal of the battery.