chemical reaction and equation

A solution of substance ‘X’ is used for whitewashing. Which among the following is the correct formula of ‘X’?

• Ca (OH)2

• Zn (OH)2

• Mg (OH)2

• NaOH

What happens when dilute hydrochloric acid is added to iron fillings? Select correct option.

• Hydrogen gas and iron chloride are produced

• Chlorine gas and iron hydroxide are produced

• No reaction takes place

• ) Iron salt and water are produced

Magnesium burns with air to produce?

• Pop sound

• Dazzling white flame

• Golden flame

• Apple green flame

C(s) + O2 (g) → CO2 (g)? The given reaction is example of?

• Double decomposition reaction

• Decomposition reaction

• Displacement reaction

• Combination reaction

Na2 SO4 (aq) + BaCl2 (aq) → BaSO4 (s) + 2NaCl(aq)? What type of reaction is this?

• Decomposition reaction

• Displacement reaction

• Double displacement reaction

• Combination reaction                                    

What type of salt is Barium sulphate?

• Soluble salt

• Insoluble salt

• Double salt

• Complex salt

Corrosion is an example of what type of reaction?

• Reduction

• Oxidation

• Displacement reaction

• Decomposition reaction

Which of the following is correct with respect to oxidation reaction?

• Gain of electrons

• Gain of oxygen atom

• Gain of hydrogen atom

• loss of oxygen atom

Which of the following is correct with respect to reduction reaction?

• Loss of electrons

• Gain of oxygen atom

• Gain of hydrogen atom

• Loss of hydrogen atom

Which of the following is the formula of quicklime?

• CaCO3

• CaO

• NaO

• Ca (OH)2