WorksheetsChemical Reactions and equations
Total questions: 15
Worksheet time: 8mins
Why should we rub a Magnesium ribbon with sand paper before using it?
To remove the layer of carbon-di-oxide formed on it.
To remove the layer of chlorine formed on it.
To remove the layer of oxygen formed on it.
To remove the layer of neon formed on it.
Magnesium and oxygen react with each other and form
Magnesium di oxide.
Magnesium triphosphate
Magnesium oxide.
Magnesium Hydroxide
What is the chemical equation of Aluminium Hydroxide?
Al2O3Al_2O_3
Al2
O3
Al3O2Al_3O_2
Al3
O2
Al(OH)2Al(OH)_2
Al(OH)2
Al(OH)3Al\left(OH\right)_3
Al(OH)3
A chemical reaction in which two or more substances combine with each other to form a single substance is called?
Double displacement reaction
Displacement reaction
Combination reaction
Decomposition rection
What is the chemical formula of Quick lime?
CaO
CaOH
NaOH
MgO
What is the chemical formula of Glucose?
C6H6O12C_6H_6O_{12}
C6
H6
O12
C6H12O5C_6H_{12}O_5
C6
H12
O5
C6H12O6C_6H_{12}O_6
C6
H12
O6
C12O6H3C_{12}O_6H_3
C12
O6
H3
H2+O2 = H2O Is an example of which reaction?
Decomposition
Double displacement
Dispalcement
Combination
By which method can we decompose water molecule?
Heating
Electrolysis
Oxidation
Reduction
Which of the following is not the characteristics of chemical reactions?
Change in colour
Change in temperature
Evolution of gas
None of the above
Quicklime reacts with water to form?
Cao
Ca(OH)2Ca\left(OH\right)_2
Ca(OH)2
NH4O2NH_4O_2
NH4
O2
LimeLime
Lime
The substances which combine in a chemical reaction is called?
Products
Reactants
Combining elements
Refractions
Why do we need to balance the chemical equations?
To maintain the law of conservation of mass
To maintain the law of constant proportions
To maintain law of constant mass
To write the chemical formula of the given compounds.
Methanol is manufactured from
Carbon-hydroxide
&
Hydrogen
Alchohol
&
Hydrogen
Sulphur
&
Carbon
Carbon-monoxide
&
Hydrogen
What is used a catalyst during the preperation of oxygen gas from potassium chlorate?
Carbondioxide
Manganese dioxide
Carbon monoxide
Methane
Why is repiration considered a exothermic reaction?
