Bissoy.com
Doctors Medicines MCQs Q&A

Related Questions

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.
Which of the following statements is/are correct? 1) Conductor contains a large number of electrons in the conduction band at room temperature. No energy gaps exist and the valence and conduction bands overlap. 2) A semiconductor is a material in which the energy gap is so large that practically no electron can be given enough energy to jump this gap. 3) An insulator is a solid with an energy gap small enough for electrons to cross rather easily from the valence band to conduction band.
Which of the following points are correct regarding the electronic configuration? A. It is the arrangement of electrons in the shells of an atom. B. It is the arrangement of electrons in the subshells. C. It is the arrangement of electrons in the orbitals of an atom.
Consider the following statements: 1. A water molecule is formed when two atoms of hydrogen bond covalently with an atom of oxygen. 2. The oxygen atom attracts the electrons more strongly than the hydrogen, this gives water an asymmetrical distribution of charge. 3. Molecules that have ended with partial negative and positive charges are known as polar molecules.  Which of the above statement is/are correct?
In the question two statements are given, followed by two conclusions, I and II. You have to consider the statements to be true even if it seems to be at variance from commonly known facts. You have to decide which of the given conclusions, if any, follows from the given statements. Statement I: No electron is proton. Statement II: All protons are atom. Conclusion I: Some electrons are atoms. Conclusion II: No electrons are atom.
Anything that influences the valence electrons will affect the chemistry of the element. Which one of the following factors does not affect the valence shell?
How may valence electrons does a silicon atom have?
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)
According to Thomson's model of an atom: 1. An atom consists of a positively charged sphere and the electrons are embedded in it. 2. The negative and positive charges are not always equal in magnitude. So, the atom as a whole is not always electrically neutral. Choose the correct code:  
Which of the following options are correct? 1. Three carbon atom is indicated by 'prop'. 2. Four carbon atom is indicated by 'but'. 3. Seven carbon atom is indicated by 'Hex'. 4. Nine carbon atom is indicated by 'Non'.