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ASSERTION: Metallic character decreases across a period. REASON: Metals are electronegative.

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(a) Both the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion. (b) The Assertion and the Reason are correct but the Reason is not the correct explanation of the Assertion. (c) Assertion ...

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Class 10 science 3 years 1 Answer 6 views Enlightened 0

ASSERTION: Isotopes have same atomic masses. REASON: Isotopes have same atomic number and have similar chemical properties.

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.Assertion: Silver becomes black in colour when exposed to atmosphere. Reason: Silver reacts with H^S gas to form Ag,S which is black in colour.

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Assertion: Copper does not reacts with the H2SO4. Reason: Copper is more reactive than hydrogen

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Assertion: Highly reactive metals are obtained by electrolytic reduction of their molten ore. Reason: Highly reactive metals can be extracted by chemical reduction.

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Class 10 science 3 years 1 Answer 2116 views Enlightened 1

Assertion: Al2O3, is an amphoteric oxide. Reason: Al2O3 reacts with acid as well as base to form salt and water.

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Assertion: Nitrogen is a nonmetal. Reason: Nitrogen has 5 valence electrons.

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Assertion :Metals like Na, K, Ca and Mg are never found in their free state in nature Reason :Metals are very reactive elements, so it combines with other non-metals to complete its octet. Metals like Na, K, Ca and Mg are never found in their state in nature.

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Assertion: Reactivity Series is an arrangement of element based on their reactivity. Reason: Reactivity Series is used to separate elements based on their reactivity

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Class 10 science 3 years 1 Answer 55 views Enlightened 0

.Assertion: Elements Pt, Ag, noble gases, etc. occur in native state in nature. Reason: Elements which are attacked by moisture, oxygen and CO2 of air occur in native state.

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Class 10 science