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Periodic Classification of Elements Class 10 Assertion Reason Questions
The following questions consist of two statements – Assertion (A) and Reason (R). Answer these questions by selecting the appropriate option given below:
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
Q.1. Assertion (A): Isotopes are placed together in the modern periodic table.
Reason (R): Isotopes have same atomic number.
(a) Both A and R are true and R is the correct explanation of A.
Q.2. Assertion (A) : In Mendeléev Periodic Table, cobalt was placed before nickel.
Reason (R): The atomic mass of cobalt is less than nickel.
(c) A is true but R is false.
Q.3. Assertion (A) : Mendeléev concentrated on the compounds formed by elements with oxygen and hydrogen in his periodic table.
Reason (R) : Hydrogen and oxygen are very reactive and form compounds with most elements.
(a) Both A and R are true and R is the correct explanation of A.
Q.4. Assertion (A) : Magnesium belongs to 3rd period of modern periodic table.
Reason (R) : The valence electrons of magnesium is 2.
(b) Both A and R are true but R is not the correct explanation of A.
Q.5. Assertion (A) : According to Mendeléev, the properties of elements are a periodic function of their atomic masses.
Reason (R) : Atomic number is equal to the number of protons.
(b) Both A and R are true but R is not the correct explanation of A.
Q.6. Assertion (A) : Noble gases have zero valency.
Reason (R) : Noble gases have stable electronic configuration.
(a) Both A and R are true and R is the correct explanation of A.
Q.7. Assertion (A) : Silicon is a metalloid.
Reason (R) : Silicon shows only properties of non-metals.
(c) A is true but R is false.
Q.8. Assertion (A) : Elements in the same vertical column have similar properties.
Reason (R) : Elements have periodic dependence upon the atomic number.
(b) Both A and R are true but R is not the correct explanation of A.
Q.9. Assertion (A) : Fluorine has greater atomic radius than nitrogen.
Reason (R): Atomic radius decreases along a period.
(d) Assertion is false but reason is true
Q.10. Assertion (A): Li, Na, K form Döbereiner’s triads.
Reason (R) : Atomic mass of Na is roughly the average of atomic masses of Li and K.
(a) Both A and R are true and R is the correct explanation of A.
Assertion (A): Elements in the same group of the periodic table have similar chemical properties.
Reason (R): Elements in the same group have the same number of valence electrons.
(a) Both A and R are true and R is the correct explanation of A.
Assertion (A): Noble gases have complete outer electron shells.
Reason (R): Noble gases have a stable electronic configuration and do not readily form chemical bonds.
(a) Both A and R are true and R is the correct explanation of A.
Assertion (A): Sodium (Na) is not more reactive than magnesium (Mg).
Reason (R): Sodium has one valence electron, while magnesium has two valence electrons.
(d) A is false but R is true..
Assertion (A): The atomic number of an element represents the number of protons in its nucleus.
Reason (R): Protons carry a positive charge and are located in the nucleus of an atom.
(a) Both A and R are true and R is the correct explanation of A.
Assertion (A): The modern periodic table is not based on atomic numbers.
Reason (R): Atomic number determines the number of protons in an atom.
(d) A is false but R is true.
Assertion (A): Atomic size decreases from left to right across a period in the periodic table.
Reason (R): The increasing effective nuclear charge does not attract the valence electrons more strongly.
(c) A is true but R is false.
Assertion (A): Fluorine (F) is more reactive than chlorine (Cl).
Reason (R): Fluorine has a higher electronegativity value than chlorine.
(a) Both A and R are true and R is the correct explanation of A.
Assertion (A): Metals generally have low ionization energies.
Reason (R): Metals have a tendency to lose electrons and form positive ions.
(a) Both A and R are true and R is the correct explanation of A.
Assertion (A): The number of valence electrons in an atom determines its chemical properties.
Reason (R): Valence electrons are not involved in the formation of chemical bonds.
(c) A is true but R is false.
Assertion (A): Transition metals show variable oxidation states.
Reason (R): Transition metals have incompletely filled d-orbitals, allowing for the loss or gain of electrons.
(a) Both A and R are true and R is the correct explanation of A.
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