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Chemistry Periodic Classification Of Elements Difficulty: Medium

In which of the following groups of modern periodic table, noble gases are placed?

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The radiations with highest speed are _______. Hydrochloric acid is also known as was the first person to isolate methane gas. He discovered that methane mixture with air could be exploded using an electric spark. Which of the following metal (shown by its symbol) is generally used for making filaments of bulb? Which of the following fertilisers has more nitrogen content?