Nust University islamabad

Which of the following is a balanced chemical equation for the reaction between calcium and water?

a) Ca+H2O→Ca(OH)2+H2

b) Ca+H2O→CaO+H2

c) Ca(OH)2+H2O→Ca+2H2O

d) CaO+H2O→Ca(OH)2

Which of the following is an example of a chemical change?

a) Freezing of water

b) Digestion of food

c) Cutting of hair

d) Burning of coal

What is the product obtained when zinc carbonate is heated?

a) Zinc oxide

b) Zinc nitrate

c) Zinc sulphate

d) Zinc chloride

What is the chemical formula of sulphuric acid?

a) H2SO4

b) HCl

c) HNO3

d) H3PO4

Which of the following is a balanced chemical equation for the reaction between iron and oxygen?

a) Fe+O→FeO

b) Fe+O2→FeO

c) FeO→Fe+O2

d) FeO→Fe+O

What is the product obtained when copper sulphate is heated?

a) Copper oxide

b) Copper nitrate

c) Copper sulphide

d) Copper chloride

What is the chemical formula of hydrochloric acid?

a) HCl

b) H2SO4

c) HNO3

d) H3PO4

Which of the following is a balanced chemical equation for the reaction between zinc and sulphuric acid?

a) Zn+H2SO4→ZnSO4+H2O

b) Zn+H2SO4→ZnSO4+H2

c) ZnSO4+H2O→Zn+H2SO4

d) ZnSO4+H2→Zn+H2SO4

What is the chemical formula of sodium hydroxide?

a) NaOH

b) Na2CO3

c) NaCl

d) NaNO3

Which of the following is an example of a chemical change?

a) Boiling of water

b) Burning of candle

c) Cutting of paper

d) Melting of ice

What is the product obtained when lead nitrate is heated?

a) Lead oxide

b) Lead nitride

c) Lead sulphate

d) Lead chloride

Which of the following is a balanced chemical equation for the reaction between magnesium and oxygen?

a) Mg+O→MgO

b) Mg+O2→MgO

c) MgO→Mg+O2

d) MgO→Mg+O