A student observes a gas in a sealed container that is pale yellow in color and highly reactive. The gas also shows strong oxidizing behavior and is the most electronegative element in the periodic table. Which halogen is being described?

A laboratory sample of a halogen is observed at room temperature. It exists as a yellow-green gas and is commonly used in water purification due to its disinfecting properties. Identify the halogen.

A chemist notes a reddish-brown liquid that produces irritating vapors and easily evaporates at room temperature. This substance is a halogen in liquid form. Which halogen is it?

A solid substance is observed in a laboratory that has a grey-black crystalline appearance. On heating, it produces violet vapors. Identify the halogen.

Which of the following correctly matches the physical state of halogens at room temperature in increasing order of atomic number?

A student is given four sealed containers labeled A, B, C, and D containing different halogens. The observations are:

A halogen element is described as follows: It is the lightest halogen, exists as a pale yellow gas, and reacts explosively with most metals and non-metals. Which element is it?

Which halogen is correctly described as producing violet vapors when heated from its solid form?

A teacher demonstrates a substance that easily evaporates, producing reddish-brown fumes. It is stored in sealed glass ampoules due to its volatility. Identify the substance.

Which statement correctly distinguishes chlorine from fluorine?

A halogen is observed in solid state with a metallic grey-black appearance. On gentle heating, it directly converts into vapor without becoming liquid. What property is being demonstrated?

A student mistakenly identifies a halogen gas as green in color and assumes it is fluorine. However, the correct observation shows a yellow-green gas used in bleaching and sterilization. What is the correct identity?

Which halogen shows the most distinct change in physical state compared to others at room temperature?

A sealed tube contains a grey-black crystalline solid. On heating, violet vapors fill the tube. The substance is most likely:

Which correct trend describes halogens in terms of physical appearance from top to bottom in Group 17?

A highly reactive halogen is observed that is never stored in glass containers due to its extreme corrosiveness and pale yellow color. Identify it.

Which of the following correct comparisons is true regarding halogen colors?

A gas is observed that strongly bleaches moist litmus paper and has a yellow-green color. It is widely used in disinfecting drinking water. Which halogen is it?