Related InterviewSolutions

• Sodium thiosulphate, `Na_(2)S_(2)O_(3).5H_(2)O` is used in photography toA. Reduce the AgBr grains to metallic AgB. Convert metallic Ag to Ag saltC. Remove undecomposed AgBr as soluble silver thisolphate complexD. Remove reduced silver
• On dissolving moderate amount of sodium metal in liquid ammonia at low temperature, which of the following does not occur ?A. Blue-colured solution is obtainedB. Ammoniated `Na^(o+)` ions are formed in solutionC. Liquid ammonia becomes good conductor of electricityD. The liquid ammonia remains diamagnetic
• Match the compounds given in (X) with uses in (Y), (X) A. NaOH , (Y) 1. Glass (X) B. `Na_(2)S_(2)O_(3)` , (Y) 2. Germicide (X) C. NaCN , (Y) 3. Antichlor (X) D. `Na_(2)CO_(3)` , (Y) 4. Soap Codes:A. A 4, B 3, C 2, D 1B. A 3, B 4, C 1, D 2C. A 2, B 3, C 4, D 1D. A 1, B 2, C 3, D 4
• The pairs of compounds which cannot exist together in aqueous solution areA. `NaHCO_(3)+NaOH`B. `NaHCO_(3)+Na_(2)CO_(3)`C. `Na_(2)CO_(3)+NaOH`D. `NaOH+NaCI`
• Lithium imparts sky-blue colour to the flame.
• A ceratin compound (A) imperts a golden yellow flame and exhibits following reactions: a. When a concentrated solution of (A) is boiled with Zn power, hydrogen gas is evolved. b. When an aqueous solution of (A) is added to an precipitate is obtained, which dissolves in excess of solution (A). Identify (A) and give equations for reactions in (ii).
• Potassium gives a -------- colour to the Bunsen flame.A. violetB. blueC. apple greenD. brick red
• Which of the following compound(s) will impart a golden yellow colour to the Bunsen flame ?A. `KCI`B. `K_(2)CO_(3)`C. `NaCI`D. `Na_(2)CO_(3)`
• Assertion (A): Alkali metals can form ionic hydrides which contain hydride ion, H. Reason (R ): The alkali metals have low EN. Their hydrides conduct electricity, when fused and liberate hydrogen at the anode.A. Statement I is true, Statement II is true, Statement II is the correct explanation for statement I.B. Statement I is true, Statement II is true, Statement II is not the correct explanation for Statement I.C. Statement I is true, Statement II is false.D. Statement I is false, Statement II is true.
• Give reasons for the following: a. Alkli metals do not occur free in nature. b. Alkali metal salts impart characteristic colour to the flame. c. Caesium is used in photoelectric cell. d. Alkali metals are good reducing agents in aqueous medium.