Related InterviewSolutions

• Name two salts that are used in black and white photography. Give equations of the reactions that occur when these are exposed to sun light
• Rancidity in the food stuff cooked in oil or ghee is prevented by using `"________".`
• (a) Complete the following equation for the chemical reaction `2FeSO_(4) overset("heat")to Fe_(2)O_(3) + ……………..` (b) What happens when water is added to quick lime ? Write chemical equation.
• (a) Write the chemical equation in the balanced form. `Fe(s) + H_(2)O(g) to Fe_(3)O_(4)(s) + H_(2)(g)` (b) Identify the type of reaction from the equation given below : `Na_(2)SO_(4)(aq) + BaCl_(2) (aq) to BaSO_(4)(s) + NaCI(aq)` (c) You could have noted that when copper powder is heated in a china dish, the surface of copper powder gets coated with black coloured substance. (i) Why is this black coloured substance formed ? (ii) What is this black substance ? (iii) Write the chemical equation of the reaction taking place.
• What happens when : `CO_(2)(g)` is bubbled through lime water (i) in small amount (ii) in excess ?
• Write the balanced equation for the following chemical reactions. (i) Hydrogen + Chlorine `rarr` Hydrogen chloride (ii) Barium chloride + Aluminium sulphate `rarr` Barium sulphate + Aluminium chloride (iii) Sodium + Water `rarr` Sodium hydroxide + Hydrogen
• Balance the equation stepwise. Is it posible to produce hydrogen by decomposition of water by means of heat, electricity or light ?
• Translate the following statements into chemical equations and then balance them.A. Hydrogen gas combines with nitrogen to form ammonia.B. Hydrogen sulphide gas burns in air to give water and sulpur dioxide.C. Barium chloride reacts with aluminium sulphate to give aluminium chloride and a precipitate of barium sulphate.D. Potassium metal reacts with water to give potassium hydroxide and hydrogen gas.
• Write the balanced chemical equations for the following and identify the type of reaction in each case : (a) `"Barium"+"Potassium"to"Barium"+"Potassium"` `"chloride (aq)"" ""sulphate (aq)"" ""sulphate (s)"" ""chloride (aq)"` (b) `"Zinc carbonate (s)"to "Zinc oxide (s)"+ "Carbon dioxide (g)"` (c ) `"Hydrogen (g)" + "Chlorine (g)"to "Hydrogen chloride (g)"` (d) `"Magnesium (s)"+ underset("acid"(aq))("Hydrochloric")to underset("chloride"(aq))("Magnesium")+ "Hydrogen (g)"`
• Balance the equation stepwise. What is the difference in the process of dissolution and a chemical reaction ?