The average age of a class of 17 girls is 12 years. If 3 new girls having average age of 8 years join the class, then the average age of the class becomes:
Total age of 17 girls = 17 × 12 = 204 years Total age of 20 girls = 204 + (3 × 8) = 228 years Therefore new average age = 228/20 = 11.4 years
Anesthesia which is administered during the surgeries in the hospitals is a mixture of which of the following gases?
Which acid is found in vinegar?
_______ is a common name of ethanoic acid.
Which of the following pair of element – atomicity is correct?
I. Helium – monoatomic
II. Oxygen – triatomic
Alkali metals have ______.
I. low melting points
II. low densities
Metallurgy is the process of:
The chemical name of ______ is sodium hydrogen carbonate.
Which of the following statement regarding Rutherford nuclear model is NOT correct?
_________is a formula for rust.
The colour of neutral litmus solution is
