Electronic configuration of some of the elements are given : Type… - Vidyadip

Question

Electronic configuration of some of the elements are given :

Type of element	Element	Atomic number	Number of electrons in shell
Metals	Sodium (Na)Magnesium (Mg)Aluminium (Al)	111213	2828283
Non-metals	Oxygen (O)Sulphur (S)Chlorine (Cl)	81617	26286287

(i) State one physical property to distinguish between metals and non-metals.
(ii) What is the nature of the bond formed when magnesium reacts with chlorine? Write the formula of the compound.
or
(ii) What is common between oxygen and sulphur? Draw the electron dot structure of $O _2$ molecule.

✓

Answer

(i) Metals are malleable and ductile while non-metals are brittle.
(ii) Ionic bond formed transfer of electrons from magnesium to chloride.
or
(ii) Both have same number of valence electron. Both belongs to the same group (Group 16) of the periodic table.

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(i) What is rusting?
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or
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which of the metals from its salt solution displaces copper ?
When zinc reacts with dilute sulfuric acid, which gas is evolved ?
When dry hydrogen is passed over a heated oxide of metal X using the apparatus , what substance is obtained and it could be in which form ?
OR
a) Which reactions are called displacement reaction?
b) When dilute hydrochloric acid is added to granulated zinc placed in a test tube, what result will be there after observation ?

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What was the colour of the crystals before heating and after heating?
Write the chemical equation for the reaction.
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→

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$\begin{array}{l}3 Fe +4 H _2 O \longrightarrow Fe _3 O _4+4 H _2 \\ \begin{array}{llll}\text { (Iron) } & \text { (water) } & \text { (iron oxide) } & \text { (hydrogen) }\end{array} \\\end{array}$
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2. What is true for the balanced chemical equation shown above?
A. Four atoms of water combine with iron to form four atoms of hydrogen.
B. Three atoms of iron combine with water to form four atoms of hydrogen.
C. Four molecules of water combine with iron to form an atom of iron oxide.
D. Three atoms of iron combine with water to form one molecule of iron oxide.

The pictures show the bonds formed by the sharing of electrons by the atoms of four different
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1. Which molecule has the strongest bond between its atoms?
A. Hydrogen
B. Carbon
C. Nitrogen
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3. Which of these is another way of representing the bonds between the atoms of a nitrogen molecule?
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Is this true about carbon compounds?	Yes or No
They are good conductors of electricity.	Yes/No
They exist in either saturated or unsaturated form	Yes/No
They have lower boiling points than ionic compounds.	Yes/No

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A piece of magnesium ribbon is added to a lask containing dilute hydrochloric acid.
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When a more reactive element displaces a less reactive element from its compound, it is called a displacement reaction. The reaction is of two types. Single displacement reaction and double displacement reaction.
Iron being more reactive than copper displaces copper from an aqueous solution of copper sulphate. This is an example of a single displacement reaction.
On adding silver nitrate solution to sodium bromide, a yellow ppt of silver bromide and solution of sodium nitrate is formed. This is an example of a double displacement reaction.
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OR
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