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सी.आई.एस.सी.ई.आईसीएसई ICSE Class 7

Give Two Examples for Each of Ionic and Covalent Bond.

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प्रश्न

Give two examples for each of ionic and covalent bond.

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उत्तर

 Example of ionic bonds— Sodium chloride and calcium oxide.
Example of covalent bond— Water, carbon dioxide.

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अध्याय 4: Atoms, Molecules and Radicals - Additional questions

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सेलिना Concise Chemistry [English] Class 7 ICSE
अध्याय 4 Atoms, Molecules and Radicals
Additional questions | Q 13

संबंधित प्रश्न

Why is it not possible to see an atom with naked eyes?


Write the names of the elements present in the:-

Acetic acid


Define: Chemical bond


Name the particle or particles you would expect to find in :

The nucleus of an atom


An atom has 13 protons and 14 neutrons.

What is the atomic mass of the atom ?


Fill in the following blanks with suitable words :

In water, the proportion of oxygen and hydrogen is .............. by mass.


Find the mass of 2 moles of nitrogen atoms.


Which has more atoms, 50 g of aluminium or 50 g of iron ? Illustrate your answer with the help of calculations.

(Atomic masses : Al = 27 u ; Fe = 25 u)


Give brief information of three subatomic particles with reference to electrical charge, mass and location.


Give scientific reason.

All the mass of an atom is concentrated in the nucleus.


The electron shell ______ is nearest to the nucleus.


Name the gas that.

Turns moist starch iodide paper blue black.


Elements X and Y have 1 and 7 electrons in their outermost shell respectively.

What will be the charge present of the molecule XY after chemical combination?


Select the correct answer to the statement given below:

The basic unit of matter is not capable of independent existence.


The smallest particle of matter that can exist by itself is ______.


Define the following term with an example.

Metal


Atoms of different elements having ______ mass numbers, but ______ atomic numbers are called isobars. 


The smallest unit of an element is ______.


What is the fundamental particle of an element?


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