GK
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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located on the left most column of the periodic table
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extremely nonreactive
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usually gases
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form negative ions
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Detailed explanation-1: -Alkali metal form a part of the leftmost group, i.e. group 1 of the ultramodern periodic table.
Detailed explanation-2: -The alkali metals are six chemical elements in Group 1, the leftmost column in the periodic table. They are lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium (Fr).
Detailed explanation-3: -The correct answer is Red color of gemstone Ruby is due to the element beryllium present in it. Alkaline-earth metals are Beryllium (Be), Magnesium (Mg), Calcium (Ca), Strontium (Sr), Barium (Ba), and Radium (Ra). Strontium chloride imparts a bright red color to a flame. Hence 1 is true.
Detailed explanation-4: -Group 1A (or IA) of the periodic table are the alkali metals: hydrogen (H), lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium (Fr). These are (except for hydrogen) soft, shiny, low-melting, highly reactive metals, which tarnish when exposed to air.