(English Medium) ICSE Class 9 - CISCE Question Bank Solutions for Chemistry

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Which of the following is the correct electronic configuration of potassium?

Explain

Octet rule for the formation of sodium chloride

Explain

Duplet rule for the formation of hydrogen 

Complete the following table relating to the atomic structure of some elements.

How do atoms attain noble gas configurations?

Write the formula of its (X)  

sulphate
nitrate
phosphate
carbonate
hydroxide.

Draw orbit structure diagram of sodium chloride (NaCl).

Draw orbit structure diagram of calcium oxide (CaO).

Compare :

Sodium atom and sodium ion

What do you understand by redox reactions?

Potassium (at No.19) and chlorine (at No.17) react to form a compound. Explain the formation of the compound on the basis of oxidation.

Potassium (at No.19) and chlorine (at No.17) react to form a compound. Explain the formation of the compound on the basis of reduction.

Potassium (at No.19) and chlorine (at No.17) react to form a compound. Explain the formation of the compound on the basis of oxidizing agent.

Potassium (at No.19) and chlorine (at No.17) react to form a compound. Explain the formation of the compound on the basis of reducing agent.

An element M burns in oxygen to form an ionic compound MO. Write the formula of the compounds formed if this element is made to continue with chlorine and sulfur separately.

\[\ce{^24_12Mg}\] and \[\ce{^26_12Mg}\] are symbols of isotopes of magnesium.

(a) Compare the atoms of these isotopes with respect to :
i. the composition of their nuclei
ii. their electronic configurations

(b) Give reasons why the two isotopes of magnesium have different mass numbers.

Write down the electronic configuration of
(i) chlorine atom (ii) chlorine ion

State the type of bond between Y and Z and give its molecular formula. 

Give the orbital diagram of the following:

Magnesium chloride

Give the orbital diagram of the following:

Nitrogen