Master cadre chemistry 2020

Thermodynamics Thermodynamics is branch of physics which deals with study of heat and temperature and transformation are interconversion of heat energy. Thermal equilibrium #if a gas enclosed in a vessel which is is completely insulated from its surroundings with fixed P,V,T,m do not change with time is in state of of equilibrium. #in thermal equilibrium temperature of the the two systems are equal Zeroth law of thermodynamics #if objects A and B separately in thermal equilibrium with third object C then objects A and B are in in thermal equilibrium with each other. First law of thermodynamics ∆Q=∆U+∆W It implies that when we supply some heat energy to the system it may do one or both the following things. (1).it may increase the internal energy of the system if it remains in the system and (2.)it may do some external work if it leaves the system is known as first law of thermodynamics. #when heat is supplied to the system ∆Q is positive but when heat is drawn from the system ∆Q is neg...

some basic concepts of chemistry Q1. What will be the molarity of of a solution which contains 5.85 g of NaCl(s) per 500 mL (a) 4mol per litre (b) 20 mol per litre (c) 0.2 mol per litre (d) 2 mol per litre Q2. The compound contain 8% of sulphur the minimum molecular weight of the compound is (a)100 (b)200 (c)350 (d)400 Q3.which of the following methods of expressing concentration varies with temperature (a) molality (b) weight percent (c) normality (d) molarity Q4. Which of the following concentration terms is/are independent of temperature? (a) molality only (b) molality and mole fraction (c) molarity and mole fraction (d) molality and normality Q5. 80 gram of oxygen contains as many atoms as in (a) 10 gram of hydrogen (b) 5 g of hydrogen (c) 80 gram of hydrogen (d) man gram of hydrogen Answers 1(c) 2.(d) 3.(c),(d) 4.(b) 5.(b)

Q1. Which of the following parameters does not characterize the thermodynamic state of matter (a) temperature (b) pressure (c) work (d) volume Q2."heat cannot itself flow from a body at lower temperature to body at higher temperature"is a statement or consequence of (a) second law of thermodynamics (b) conservation of momentum (c) conservation of mass (d) first law of thermodynamics Q3. Even carnot engine cannot give 100% efficiency because we cannot (a) prevent radiations (b) find ideal sources (c) reach absolute zero temperature (d) eliminate friction Q4. If the temperature of a source is increased the efficiency of carnot engine (a) increase (b) decrease (c) remains constant (d) first increased and remains constant Q5. The internal energy of an ideal gas is function of its absolute temperature only this statement refers to (a) avogadro law (b) Maxwell law (c) joules law (d) regnault's law Answers 1.(c) 2.(a) 3.(c) 4.(d) 5.(c)

Daily Quiz Q1. Which of the following pears have same number of atoms (a) 16 gram of O2(g) and 4 gram of H2 (b) 16 gram of O2 and 44 gram of CO2 (c) 28 gram of N2 and 32 gram of O2 (d) 12 gram of C(s) and and 23g of Na(s) Q2. One mole of calcium phosphide on reaction with excess of water gives (a) 1 mol of phosphine (b) two moles of phosphoric acid (c) 2 moles of phosphine (d) one mole of phosphorus pentoxide Q3. Hydrocarbon is composed of 75% carbon the empirical formula of the compound is (a)CH2 (b)CH3 (c)CH4 (d) C2H7 Q4. What is molality of pure water (a)1 (b)18 (c)55.5 (d) none of these Q5. Molarity of 98% of H2 SO4 (d=1.8g/mL) bhai wait is (a)6M (b)18M (c)10M (d)4M

Q1. The amount of of substance deposited bye the passage of 1 ampere of current for one second is equal to (a) equivalent mass (b) molecular mass (c) electrochemical equivalent Q2.In which cell the free energy of chemical reaction is directly converted into electricity (a) leclanche cell (b) concentration cell (c)fuel cell. (d) lead storage battery Q3. Which of the following statements are correct regarding dry cell? (a) zinc container acts as anode (b)sync container in touch with a paste of MnO2 and carbon (c) dry cell can easily be charged (d) graphite rod acts as cathode Q4. Which of the following metals can displace H2 from an acid (a)iron (b) nickel (c) copper (d) silver Q5. Galvanized iron sheets are  coated with  (a)C (b)Cu (c)Zn (d)Ni

Q1 for a redox reaction to proceed in a cell the EMF must be (a) positive (b) negative (c) zero (d) fixed Q2. Point out the correct statement in a cell of zinc and copper (a) zinc acts as cathode and copper acts as anode (b) zinc acts as anode and copper x as cathode  (c) the standard reduction potential of zinc is more than that of copper (d) the flow of electrons is from copper to zinc Q3. Which of the following statements is incorrect about electrochemical cell? (a) electrons are released at anode (b) chemical energy is converted into electrical energy (c) salt bridge maintains the electrical neutrality of the electrolytes (d) cell can work indefinitely Q4. In a galvanic cell which one of the following statements is not correct? (a) anode is negative charged (b) cathode is positively charged (c) reduction takes place at anode (d) reduction takes place at cathode Q5. If the conductivity and conductance of a solution is same then its cell constant is equal to (a)1 (b)0 (c)10 (d)10...

Q1. Which of the following terms are unitless? (a) molality (b) molarity (c) mole fraction (d) mass per cent Q2. How many  moles of sucrose are in tablespoon of sugar that contains 3.26 gram? (a)0.00953 (b)0.053 (C)0.0039 (d)0.0953 Q3. Which of the following statements about a compound  is incorrect? (a)a molecule of a compound has atoms of different elements. (b)a compound cannot be separated into its constituent elements by physical method of separation. (c) a compound retains the physical properties of its constituent elements (d) the ratio of atoms of different elements in a compound is fixed. Q4. One of the statements of Dalton atomic theory is given below "Compounds are formed when atoms of different elements combine in a fixed ratio." Which of the following laws is not related to this statement (a) law of conservation of mass (b) law of definite proportion (c) law of multiple proportions (d) avogadro law Q5. What is the the mass percent of carbon in carbon dioxide? (a)...

Q1. The most unsymmetrical and symmetrical systems are are respectively (a) tetragonal, cubic (b) triclinic, cubic (c) rhombohedral, hexagonal (d) orthorhombic, cubic Q2. Close packing is maximum in the crystal which is (a)bcc (b)FCC (c) simple cubic (d)all Q3. If the alignment of of magnetic moments in a substance is in a compensatory way so as to give net magnetic moment then substance is said to be (a) ferromagnetism (b) antiferromagnetism (c) ferri magnetism (d) diamagnetism Q4. The number of tetrahedral and octahedral holes in a hexagonal primitive unit cell are (a)8,4.   (b)6,12 (c)2,1 (d)12,6 Q5. Example of of body centred cube is (a) sodium (b) magnesium (c) zinc (d) copper

Q1 which of the following property of water can be used to explain the shperical shape of of rain droplets? (a) viscosity (b) surface tension (c) critical phenomena (d) pressure Q2. The interaction energy of London force is inversely proportional to 6th power of of the distance between two interacting particles but their magnitude depends upon (a) change of of interacting particles (b) mass of of interacting particles (c) strength of permanent dipoles in the particles (d) polarizability of interacting particles Q3. Increase in kinetic energy can overcome intermolecular forces of attraction. How will the viscosity of liquid be affected by increase in temperature? (a) increase (b) no effect (c) decrease (d) no regular pattern will be followed Q4. How does the surface tension of a liquid vary with increase in temperature? (a) remains same (b) decreases (c) increases (d) no regular pattern will be followed Q5. Under which of the following two conditions applied together, a gas Daviates mos...

Q1. In case of alkali metals, the covalent character decrease in in the order (a)MCl>MI>MBr>MF (b)MF>MCl>MBr>MI (c)MF>MCl>MI>MBr (d)MI>MBr>MCl>MF Q2. Which of the following is least likely to behave as Lewis base (a)NH3 (b)BF3. (c)OH-. (d) H2O Q3 which of the following is polar molecule? (a)BF3.    (b)SF4.     (c)SiF4.  (d)XeF4 Q4. Dipole induced dipole interactions are present in which of the following pairs (a) H2O and alcohol (b)Cl2 and CCl4 (c)HCl and He atoms (d)SiF4 and He atoms Q5.XeF2 is isostructural with (a)TeF2 (b)ICl2-.  (c)SbCl3.    (d)BCl3 Q6. In which of the following pairs both the species are not isostructural  (a)SiCl4.     (b) Diamond, carbide.  (c)NH3, PH3 (d)XeF4,XeO4 Q7. Consider the molecules CH4,NH3,and H2O which of the following statement is false? (a) the H-O-H bond angle in H2O is larger than the H-N-H bond angle in CH4 (b) the H-O-H bond angle in water is...

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Spectroscopy may be defined s the interaction of matter with electromagnetic radiations so that energy is absorbed or a method in accordance with relation              ΔE=hν There is two types of spectroscopy (1) emission spectroscopy (2) absorption spectroscopy Emission spectroscopy Atoms or molecules are subjected to to intense heat are an electric discharge ,absorb energy and get excited. But lifetimes of excited state is very short So they return to their lower exited states or ground states. And at that time absorbed energy is is released in the the form of of light. And this light passed through prism it gives rise to emission spectrum Such a recorded spectrum on photographic plate appears as bright lines on dark background. Emission spectroscopy is used for study of atoms. Absorption spectroscopy If electromagnetic radiations allowed to pass through medium some of it reflected some is observed and other is transmitted when this transmitted light...