Question 681 Temporary hardness of water is due to the presence of ? A) Magnesium Bicarbonate B) Magnesium Sulphate C) Calcium chloride D) Calcium carbonate No Details
Question 682 Permanent Hardness of the water can be removed by adding ? A) Soda lime B) Washing soda C) Sodium Bicarbonate D) Sodium chloride No Details
Question 683 Which of the following is not a non? A) Acetic Acid B) Ethanol C) Glucose D) Urea No Details
Question 684 Which of the following gas is used in eigarette lighters ? A) Butane B) Propane C) Methane D) Ethane No Details
Question 686 Periodic table was given by ? A) Faraday B) Lavoisier C) Arrhenius D) Mendeleef No Details
Question 687 The chemical name of washing soda is ? A) Sodium sulphate B) Sodium Bicarbonate C) Sodium carbonate D) Sodium Biosulphate No Details
Question 688 Air contains maximum amount of ? A) Oxygen B) Nitrogen C) Hydrogen D) Carbon - dioxide No Details
Question 689 Which is used in preparation of dynamite? A) Glycerol B) Ethyl alcohol C) Methyl alcohol D) Glycol No Details
Question 690 The nucleus of a hydrogen atom consists of ? A) 1 proton only B) 1 proton + 2 neutrons C) 1 neutron only D) 1 electron only No Details