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Which of the following statements is correct regarding the oxidation number of Oxygen? I. The oxidation number of Oxygen in most compounds is -2. II. When Oxygen is bonded to Fluorine in compounds like Oxygen difluoride and Dioxygen diflouride, the Oxygen is assigned an oxidation number of +2 and +2 respectively. III. In peroxide, an Oxygen atom is assigned an oxidation number of -1 and in Superoxide, each oxygen atom is assigned an oxidation number of -1/2.
Consider the following statements : A = If n is even, then n2 is even. B = If n2 is not even, n is not even. C = If n2 is even, then n is even. D = If n is not even, then n2 is not even. Which of the following statements is true?
Which of the following metals does NOT react with Oxygen even at a high temperature?
Match List-I with List-II and select the correct answer using the code given below the Lists: List I (Low-Latitude Climate) List I (Characteristic) A. Wet Equatorial 1. Uniform temperatures, mean near 27°C  B. Monsoon and trade wind coastal 2. Marked temperature cycle with very high temperature before the rainy season C. Wet-dry tropical  3. Temperatures show an annual cycle with a high temperature in the high-Sun season Strong temperature cycle. with intense temperature during the high-Sun season  D. Dry tropical 4. Strong temperature cycle, with intense temperature during the high-Sun season
A mixture of oxygen and ethyne is burnt for welding. Which of the following statements is correct about NOT using a mixture of ethyne and air? 1. Ethyne may not burn completely with air as with pure oxygen. 2. Without mixing oxygen, it is difficult to reach the high temperatures needed for welding. Select the correct answer using the code given below.
In a well aerated and agitated microbial culture, the 'supply' of oxygen is equal to 'demand' (uptake) of the growing culture. The KLa for such a system will be (KLa = volumetric mass transfer coefficient, C* = dissolved oxygen concentration in liquid in equilibrium with gaseous oxygen, C = instantaneous value of dissolved oxygen concentration, 'r' = specific oxygen uptake rate per unit weight of cells, X = dry weight of the cells per unit volume)
Which of the following statement is/are true? I. Some metals react with water to produce metal hydroxides and hydrogen gas II. Generally, nonmetals do not react with water 
The following question has two premises and two conclusions. If the premises re assumed to be true (irrespective of factuality), then, in respect of each of the items given below, which of the following conclusions follow logically? Premises: All metals are grey in colour. Some metals are heavy. Conclusion: I. All heavy metals are grey in colour. II. All light metals are not grey in colour.
You are given three metals 'X', 'Y' and 'Z'. Metal 'X' is found to react with an aqueous solution of both YSO4 and ZSO4 whereas metal 'Z' is found to react only with aqueous solution of YSO4. Based on these observations, select the correct statement from the following.
Which one of the following metals does not react with oxygen, water or acids?