Chemical Reaction-1

The ______________ are in left hand side of a reaction.

• reactant

• product

• initiator

• all of them

Burning of methane is a ____________ reaction.

i. combination

ii. decomposition

iii. endothermic

iv. exothermic

• i and ii

• ii and iii

• i and iv

• ii and iii

Burning of magnesium ribbon gives __________________.

• ashes

• metal pieces

• soot

• white precipitate

We can identify the change as chemical change if there is _________.

• change shape and colour

• evolution of gases

• rise in temperature

• all of them

The -----> in a reaction gives us an idea of _____________.

• which is product

• which is reactant

• direction of reaction

• the end product

CO + H₂ -----> _____________________.

Complete the reaction in balanced form by choosing the correct option.

• CO₂ + H₂O

• CH₃OH

• COOH

• H₂CO₃

The reaction for photosynthesis is _________.

• 6CO₂ + 6H₂O --------> C₆H₁₂O₆

• 6CO₂ + 6H₂0 ----------> C₆H₁₂O₆ + 6O₂

• 6CO₂ (aq) + 6H₂0 (l) ----------> C₆H₁₂0₆ (aq) + 6O₂ (aq)

• both iii and iv

Magnesium ribbon is cleaned before burning because ____________.

• it needs to be shiny

• we need to get the desired product

• it is always covered with a layer of magnesium oxide

• we need to remove the impurities which can slow down or stop the process of burning

When two or more reactant combine to form one or more product respectively, its called ________________ reaction.

• displacement

• decomposition

• combination

• double displacement

___________ reaction is opposite of combination reaction.

• exothermic

• endothermic

• precipitating

• decomposition