Match List-I with List-II and select the correct answer using the code given below the Lists: List-I (Element): A. Mg B. Ca C. Sr D. Ba List-II (Property/Use): 1. Gives red colour to flame 2. Sulphate compound used in medicine to examine the alimentary canal of a patient 3. Traps the energy of sunlight in photosynthesis 4. Control of muscle contraction

Bright light is found to emit from photographer's flashgun. This brightness is due to the presence of which one of the following noble gases?

Which of the following gasses is/are lighter than air? 1. Hydrogen chloride 2. Sulfur dioxide 3. Helium

Which of the following represent the suitable condition for the liquefaction of gases?

Which one of the following greenhouse gases is present in the largest quantity in the atmosphere?

For an ideal gas, which one of the following statements does not hold true?