Question Text
Question 1 :
A silver ornament of mass ‘m’ gram is polished with gold equivalent to $1\%$ of the mass of silver. Compute the ratio of the number of atoms of gold and silver in the ornament.
Question 3 :
What is an element which forms rust on exposure to moist air?
Question 7 :
What is a white lustrous metal used for making ornaments and which tends to get tarnished black in the presence of moist air?
Question 9 :
Calculate the number of moles of magnesium present in a magnesium ribbon weighing 12 g. Molar atomic mass of magnesium is $24g mol^{-1}$.
Question 21 :
Formula of sodium carbonate is ______ and that of ammonium sulphate is ______.
Question 24 :
3.42 g of sucrose are dissolved in 18g of water in a beaker. The number of oxygen atoms in the solution are _____.
Question 27 :
Which has more number of atoms, 100 g of sodium or 100 g of iron?
