Which refining process is generally used in the purification of low melting metals?

Match List-I with List-II : List - I (Name of ore/mineral) List - II (Chemical formula) (a) Calmine (i) $$Zns$$ (b) Malachite (ii) $$FeC{O}_3$$ (c) Siderite (iii) $$ZnC{O}_3$$ (d) Sphalerite (iv) $$CuC{O}_3.Cu(OH{)}_2$$ Choose the most appropriate answer from the options given below :

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : Aluminium is extracted from bauxite by the electrolysis of molten mixture of Al2O3 with cryolite. Reason (R) : The oxidation state of Al in cryolite is +3. In the light of the above statements, choose the most appropriate answer from the options given below :

Calamine and Malachite, respectively, are the ores of :

Which one of the following 0.06 M aqueous solutions has lowest freezing point?

Which one of the following 0.10 M aqueous solutions will exhibit the largest freezing point depression?

The gas released during anaerobic degradation of vegetation may lead to :

Given below are two statements : Statement I : The value of the parameter "Biochemical Oxygen Demand (BOD)" is important for survival of aquatic life. Statement II : The optimum value of BOD is 6.5 ppm. In the light of the above statements, choose the most appropriate answer from the options given below :

Given below are two statements : Statement I : An allotrope of oxygen is an important intermediate in the formation of reducing smog. Statement II : Gases such as oxides of nitrogen and sulphur present in troposphere contribute to the formation of photochemical smog. In the light of the above statements, choose the correct answer from the options given below :

Given below are two statements : Statement I : The pH of rain water is normally 5.6. Statement II : If the pH of rain water drops below 5.6, it is called acid rain. In the light of the above statements, choose the correct answer from the options given below :

The presence of ozone in troposphere :

The type of pollution that gets increased during the day time and in the presence of O3 is :

The green house gas/es is (are) : (A) Carbon dioxide (B) Oxygen (C) Water vapour (D) Methane Choose the most appropriate answer from the options given below :

Reducing smog is a mixture of :

Which of the following statement(s) is (are) incorrect reason for eutrophication? (A) excess usage of fertilisers (B) excess usage of detergents (C) dense plant population in water bodies (D) lack of nutrients in water bodies that prevent plant growth Choose the most appropriate answer from the options given below :

The statements that are TRUE : (A) Methane leads to both global warming and photochemical smog (B) Methane is generated from paddy fields (C) Methane is a stronger global warming gas than CO2 (D) Methane is a part of reducing smog Choose the most appropriate answer from the options given below :

Given below are two statements : Statement I : Non-biodegradable wastes are generated by the thermal power plants. Statement II : Bio-degradable detergents leads to eutrophication. In the light of the above statements, choose the most appropriate answer from the options given below :

Which one of the following gases is reported to retard photosynthesis?

Given below are two statements : Statement I : Chlorofluoro breakdown by radiation in the visible energy region and release chlorine gas in the atmosphere which then reacts with stratospheric ozone. Statement II : Atmospheric ozone reacts with nitric oxide to give nitrogen and oxygen gases, which add to the atmosphere. For the above statements choose the correct answer from the options given below :

Which one of the following statements is NOT correct?