Question : Soft silvery metallic element which ionizes easily when heated or exposed to light and is present in atomic clocks is:
Option 1: Cerium
Option 2: cesium
Option 3: Calcium
Option 4: califonrium
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Correct Answer: cesium
Solution : The correct optin is - cesium.
Cesium is often used in ultra-precise atomic clocks. Among alkali metals, cesium has the lowest ionization energy and a melting point of 38.4 °C. As a result, it may fully demonstrate the photoelectric effect.
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Question : Calcium salt used as fertilizer is
Option 1: Calcium Carbide
Option 2: Calcium Carbonate
Option 3: Calcium Cyanide
Option 4: Calcium Sulphate
Question : What is the name of a metallic radioactive transuranic element with atomic number 101 in the actinide series, discovered in 1955?
Option 1: Seaborgium
Option 2: Nobelium
Option 3: Mendelevium
Option 4: Rutherfordium
Question : The mercury and sodium street lamps light up because of:
Option 1: Atomic emission
Option 2: Atomic absorption
Option 3: Electron emission
Option 4: Electron absorption
Question : The chemical that is used to ripen mangoes is
Option 1: calcium sulphide
Option 2: calcium carbide
Option 3: calcium carbonate
Option 4: calcium chloride
Question : The element absorbed both in cation and anion form is
Option 1: Sulphur
Option 2: Nitrogen
Option 4: Phosphorus
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