Question Text
Question 2 :
What is the SI prefix for $10^{-1}$ multiples and submultiples of a unit?
Question 5 :
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 6 :
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 7 :
What is the element used by Rutherford during his $\alpha$ - scattering experiment?
Question 8 :
Which of the following statements is not true about an atom?
Question 9 :
A change in the physical state can be brought about ___.
Question 10 :
3.42 g of sucrose are dissolved in 18g of water in a beaker. The number of oxygen atoms in the solution are _____.
Question 21 :
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 24 :
Compute the ratio by mass of the combining elements for Carbon monoxide.
Question 26 :
Compute the ratio by mass of the combining elements Magnesium sulphide.
Question 30 :
Give the formulae of the compounds formed from hydrogen and sulphur.
Question 32 :
What is the fraction of the mass of water due to neutrons?
Question 36 :
Compute the ratio by mass of the combining elements for Ammonia.
Question 39 :
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 45 :
Calculate the number of molecules of sulphur ($S_8$) present in 16 g of solid sulphur.
