CURIOUSITY QUIZ: ATOM

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Test Your knowledge on 'Atoms' prepared exclusively according to the NCERT science curriculum for Class-9 . Attempt all the questions by clicking on the right option. Submit the completed Form by clicking the 'Submit' button at the end of the Form. Get your Score and the correct Answer by clicking the 'View score' button. Good Luck!

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What does Atom mean literally and who coined the word?

1 point

End product and Maharishi Kanad of India respectively

Ultimate particle and Leucippus of Greece respectively

Indivisible and Democritus of Greece respectively

Smallest particle and Pakudha Katyayama of India respectively

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He laid the foundation of chemical sciences by establishing a very important law of chemical combination i.e. the Law of conservation of Mass and , for this discovery, he is often referred to as the Father of Chemistry :

1 point

John Dalton

Antoine L. Lavoisier

Berzilius

Proust

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Atomic radius is generally measured in units called :

1 point

Millimeters

Nanometers

Micrometers

Decimeters

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Which is NOT a postulate of Dalton's atomic theory?

1 point

All matter is made of very tiny particles called atoms, which participate in chemical reactions..

Atoms are divisible particles (as they can be divided into electrons, protons and neutrons) which are neither created nor destroyed in a chemical reaction.

Atoms of a given element are identical in mass and chemical properties.

Atoms of different elements have different masses and chemical properties.

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Now-a-days, which international scientific organization approves names of elements, their symbols and units?

1 point

IUPAC (International Union of Pure and Applied Chemistry)

International Chemical Union (ICU)

American Chemical Society (ACS)

World Association of Theoretical and Computational Chemists (WATCC)

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Which element is universally chosen as the standard reference for measuring atomic masses of elements?

1 point

Hydrogen

Oxygen

Carbon-12 isotope

Carbon-14 isotope

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The Latin name of this element is Kalium :

1 point

Silver

Gold

Potassium

Sodium

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How many times is an Ozone molecule heavier than an Oxygen molecule?

1 point

3 times

1.7 times

2 times

1.5 times

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The chemical formula of a molecular compound of an element is determined by its :

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Charge

Valency

Mass

Charge to Mass ratio

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The chemical formula of an ionic compound of an element is determined by its :

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Charge

Mass

Valency

Charge to Mass ratio

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In a chemical reaction equation, it is more convenient to refer to the amount of a substance in terms of the number of its molecules or atoms, rather than their masses. What is the SI unit of the amount of a substance (molecules/atoms/ions) in Chemistry? What does it literally mean ? Who introduced this term ?

1 point

amu, atomic mass unit ; Antoine L. Lavoisier (1778)

Avogadro Number, Number of entities, Amedeo Avogadro(1811)

Gram; Measure of Weight; Antoine L. Lavoisier (1778)

Mole; Heap or Pile; Wilhelm Ostwald (1896)

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The Atomic Mass of an element is a dimensionless physical quantity denoted by a simple number. This actually is its :

1 point

Apparent Atomic Mass

Relative Atomic Mass

Mean Atomic Mass

Standard Atomic Mass

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Who was the first to measure the Charge to Mass ratio (e/m) of an electron ?

1 point

James Chadwick

J.J. Thomson

Eugen Goldstein

Earnest Rutherford

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Isotope of which element is used to treat Cancer ?

1 point

Co-65

Co-60

Co-70

Co-55

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How many times is a Proton heavier than an electron ?

1 point

3400

1840

5678

597

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How many neutrons are present in a Helium atom?

1 point

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The Atomic Mass of various elements shown in the Periodic Table are actually their Relative Atomic Mass. What is the unit of the Relative Atomic Mass of the atom of an element ?

1 point

Mole

amu

No unit; because it is a ratio

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Who propounded the Law of Constant Proportions or definite Proportions , that is, in a chemical substance, the elements are always present in a definite proportion by mass ?

1 point

Ernest Rutherford

John Dalton

Antoine L. Lavoisier

Joseph Proust

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