Question Text
Question 2 :
Formula of sodium carbonate is ______ and that of ammonium sulphate is ______.
Question 3 :
Which of the following statements is not true about an atom?
Question 4 :
You are provided with a fine white coloured powder which is either sugar or salt. How would you identify it without tasting?
Question 5 :
Compute the ratio by mass of the combining elements for Ammonia.
Question 6 :
Give the formulae of the compounds formed from carbon and oxygen.
Question 8 :
Give the formulae of the compounds formed from nitrogen and hydrogen.
Question 9 :
Compute the ratio by mass of the combining elements for Carbon monoxide.
Question 15 :
Why is it not possible to see an atom with naked eyes?
Question 16 :
Which has more number of atoms, 100 g of sodium or 100 g of iron?
Question 17 :
Give the formulae of the compounds formed from hydrogen and sulphur.
Question 21 :
What is a white lustrous metal used for making ornaments and which tends to get tarnished black in the presence of moist air?
Question 23 :
When 3.0 g of carbon is burnt in 8.0 g of oxygen, 11.00 g of carbon dioxide is produced. What mass of carbon dioxide will be formed when 3.00 g of carbon is burnt in 50.0 g of oxygen?
Question 24 :
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?