Total age of 22 girls = 22 × 18 = 396 years Total age of 24 girls = 396 + (2 × 12) = 420 years Therefore new average age = 420/24 = 17.5 years
Alkali metals have ______.
I. low melting points
II. low densities
In a compound, the elements are always present in definite proportions by:
Anesthesia which is administered during the surgeries in the hospitals is a mixture of which of the following gases?
What is the common name of sodium carbonate?
Which dating method is commonly used to determine the age of materials from prehistoric times?
How can a mixture of sand and salt be separated?
Adding which substance gives a blue color to glass?
In the synthesis of aspirin (acetylsalicylic acid) from salicylic acid, which reagent is used?
Which is the best fire-extinguisher?
Which element gives hardness to stainless steel?
