11-NCERT Chemistry Most Important Questions

Q1. Which technique one can employ to separate crude oil in petroleum industry? Solution Fractional distillation technique can be used to separate crude oil in petroleum industry. Q2. How to detect percentage of oxygen in an organic compound? Solution Percentage of oxygen in an organic compound is detected by the difference between the total percentage and the sum of percentages of all other elements present. Q3. Alkyl radical stability increases as we proceed from: 1) Ethyl free radical< Isopropyl free radical<Methyl free radical 2) Methyl free radical<Ethyl free radical< Isopropyl free radical 3) Ethyl free radical<Methyl free radical< Isopropyl free radical 4) Isopropyl free radical< Methyl free radical<Ethyl free radical Solution Alkyl radica...

Q1. Generally atomic radii increases down the group, but atomic radius of Ga is less than that of Al. Why? Solution The presence of additional 10 d-electrons offer only poor screening effect for the outer electrons from the increased nuclear charge in gallium hence the atomic radius of Ga is less than Al. Q2. What are the applications of silicon compounds? Solution Applications of Silicon Compounds:a. Ferro-silicon and calcium silicate are used as alloying elements in the development of steel or cast iron.b. Silicon carbide possess a diamond like crystalline structure. Due to its hardness it is used as an abrasive. c. CaSiO 3 is used as a component of cement. Q3. What are the similarities between graphite and diamond? Solution Both graphite and diamond are forms of carbon. As such, they are said to be allotropes of carbon. Both occur naturally. Both are mined for industrial purposes, though larger diamonds are sought and used for other things. Both are prod...