Chemical Reactions and equations

The following is an example of :

4NH₃ + 5O₂ -----> 4NO + 6H₂O

(i) displacement reaction

(ii) combustion reaction

(iii) redox reaction

(iv) neutralization reaction

• (i) and (iv)

• (ii) and (iii)

• (i) and (ii)

• (iii) and (iv)

The electrolysis of water is a decomposition reaction. The mole ratio of hydrogen and oxygen gases liberated during electrolysis of water

• 1:1

• 2:1

• 4:1

• 1:2

Tags

NGSS.HS-PS1-7

Which of the following processes involve chemical reactions

• Storing of oxygen gas under pressure in a gas cylinder

• Liquification of air

• Keeping petrol in a china dish in open

• Heating copper wire in the presence of air at high temperature

Identify the type of reaction :

Iron nails when left dipped in blue copper sulphate solution become brownish in colour and the blue colour of copper sulphate fades away.

Tags

NGSS.HS-PS1-2

What is the formula of magnesium nitride?

• MgN₃

• Mg₂N₃

• Mg₃N₂

• Mg₂N

Tags

NGSS.HS-PS1-2

What are the products of decomposition of PbCO₃

• PbO + CO₂

• Pb + CO₂ + O₂

• PbO + C

• Pb + C + O₂

A metal 'M' reacts with an acid according to the equation :

M + H⁺ --------> M³⁺ + H₂

_{The metal can be}

• Potassium

• Magnesium

• Aluminium

• Barium

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

When dil. sulphuric acid is added to pieces of iron sulphie, hydrogen sulphide gas is produced and soluble ferrous sulphate is produced. The type of chemical reaction involved is :

• Decomposition reaction

• Combination reaction

• Displacement Reaction

• Double displacement reaction

When ethane reacts with oxygen present in air it produces CO₂ and water. In this reaction how many moles of oxygen is used?

• 3

• 5/2

• 2

• 7/2

Tags

NGSS.HS-PS1-7

A powdered salt X was heated in a dry test tube and evolution of brown fumes of nitrogen dioxide and a yellow residue of lead oxide is formed. The salt X is :

• Magnesium Carbonate

• Lead nitrate

• Ammonium Sulphate

• Calcium carbonate

Tags

NGSS.HS-PS1-2