Chemistry
Which of the following is the most active chemically?
A. Chlorine
B. Fluorine
C. Lithium
D. Iodine
B. Fluorine
Which among the following is a Noble Gas?
A. Nitrogen
B. Hydrogen
C. Oxygen
D. Helium
D. Helium
How many electrons can the s-orbital accommodate?
A. 1
B. 2
C. 8
D. 16
B. 2
Which of the following alkali metal ions has the highest hydration enthalpy?
A. Lithium
B. Sodium
C. Potassium
D. Caesium
A. Lithium
Which of the following is responsible for the anomalous behaviour of lithium in the periodic table?
A. High melting point
B. Exceptionally small size of its atom and ion
C. High reactivity
D. Low ionisation energy
B. Exceptionally small size of its atom and ion
Which of the following statements about alkali metals is correct?
A. Lithium is the most powerful reducing agent.
B. Sodium is the least powerful reducing agent.
C. Potassium is the most inert metal.
D. Rubidium is the most abundant alkali metal.
A. Lithium is the most powerful reducing agent.
What is the atomic number of Barium?
A. 54
B. 56
C. 58
D. 60
B. 56
Which of the following elements has the highest first ionisation enthalpy?
A. Magnesium
B. Strontium
C. Beryllium
D. Barium
C. Beryllium
Which of the following is the use of washing soda?
A. Softening of water
B. Manufacture of glass
C. Manufacture of paints
D. All of the above
A. Softening of water
What is the general electron configuration of all alkaline earth metals?
A. ns¹
B. ns²
C. ns² np6
D. None of the above
B. ns²