Question Text
Question 1 :
Which has more number of atoms, 100 g of sodium or 100 g of iron?
Question 2 :
What is the SI prefix for $10^{-9}$ multiples and submultiples of a unit?
Question 13 :
Compute the ratio by mass of the combining elements Magnesium sulphide.
Question 19 :
Give the formulae of the compounds formed from carbon and oxygen.
Question 21 :
You are provided with a fine white coloured powder which is either sugar or salt. How would you identify it without tasting?
Question 24 :
A 0.24 g sample of compound of oxygen and boron was found by analysis to contain 0.096 g of boron and 0.144 g of oxygen. Calculate the percentage composition of the compound by weight.
Question 25 :
Which of the following statements is not true about an atom?
Question 29 :
In photosynthesis, 6 molecules of carbon dioxide combine with an equal number of water molecules through a complex series of reactions to give a molecule of glucose having a molecular formula $C_6 H_{12} O_6$. How many grams of water would be required to produce 18 g of glucose?
Question 30 :
Give the formulae of the compounds formed from nitrogen and hydrogen.