Elements are arranged in the modern Periodic Table based on their.....

Which of the following is a diprotic acid?

What salt is soluble in water?

When sodium thiosulphate solution react with acid, gas Y with pungent smell is produced. Name the gas Y

Element P and element Q are located in Group 2 and Group 17 in the Periodic Table respectively. Element P reacts with element Q to form a compound. What is the chemical formula of the compound?

Which of the following substances consists of atoms?

Element L reacts with element M to form an ionic compound with the formula LM₂. The electron arrangement of an atom of M is 2.8.7. Which of the following is a possible electron arrangement of an atom of L?

Which statement shows the difference between hexene and hexane?

The joint of a student’s leg is swollen and painful. What medicine is suitable to be given to the student?

Caffeine, C₈H₁₀N₄O₂ is a natural stimulant found in coffee, tea and cocoa beans. What is the percentage of carbon atom by mass in this compound?

[Relative atomic mass : H = 1; C = 12; O = 16; N = 14]

A decorative glassware maker encountered problem on his products which are fragile. He needs another material which is transparent but not fragile to replace glass. What is the most suitable material?

The reaction between excess zinc and hydrochloric acid produces 20 cm³ of hydrogen in 10 s. The reaction is completed in 1 minute and the maximum volume of hydrogen obtained is 40 cm³. What is the average rate of reaction at 10 s?

Who discovered neutrons?

Which of the following has the highest rate of reaction?