Chemistry For Class IX - Chapter No.2 - MCQs And Fill In The Blanks

Go To Index

Chapter No.2: Laws Of Chemical Combinations
Multiple Choice Questions/
Fill In The Blanks

Fill In The Blanks:

i) 18 grams of H₂O contains 6.02x10²³ molecules.
ii) A change which alters the composition of a substance is called chemical change.
iii) A reaction in which a chemical substance breaks down to form two or more simpler substance is called decomposition reaction.
iv) The reaction of NaCl with AgNO₃ is given as:
NaCl + AgNO₃ → NaNO₃ + AgCl
Is the reaction of a type double displacement.
v) When metals react with acid or water then produce H₂ gas.
vi) Addition is the reaction in which two or more substances combine together to form a single substance.
vii) A reaction in which a substance burns in oxygen to produce heat and flame is called combustion reaction.
viii) Chemical equation is the short hand method to describing chemical reaction.
ix) The reaction Zn + 2HCl→ZnCl₂ + H₂ (g) is the single displacement reaction.