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NCERT - 10th - Chemistry | Sunali\'s Classes

Question 1. Molar mass of sodium acetate 10th ncert chemistry 00 How is it defined? The level of contamination was 15 ppm by mass. Give its statement. Burning a small sample of it in oxygen gives 3. A volume of Calculate i empirical formula, ii molar mass of the gas, and iii molecular formula. Question 2. Will the answer change if the temperature and pressure are changed? Calculate the ionisation energy of sodium in kJ mol�1.

Calculate the rate of emission of quanta per second. What is the energy associated with the fifth orbit? The ground state electron energy is �2. What is the longest wavelength of light in cm that can be used to cause this transition?

If its K. Give the possible values of n, l and ml for this electron. Deduce i the number of protons and ii the electronic configuration of the element. What are the possible values of l and ml? Calculate the radius of carbon atom if the length of this arrangement is 2. 10th ncert chemistry 00 a radius of zinc atom in pm and b number of atoms present in a length of 1.

Calculate the number of electrons present in it. If the static electric charge on the oil drop is �1. If the thin foil of light atoms like aluminium. Answer briefly. Assign the atomic symbol. If the ion conatins Assign the symbol to this ion. If the number of photons emitted is 5. If it emits strongly at nm, calculate a the frequency of emission b distance traveled by this radiation in 30 s c energy of quantum and d number of quanta present if it produces 2 J of energy.

Question 3. How do you explain the variation? Name a species that will be isoelectronic 10th ncert chemistry 00 each of the following atoms or ions.

Hint : Requirements for comparison purposes. Calculate the ionization enthalpy of atomic hydrogen in terms of J mol�1. Hint: Apply the idea of mole concept to derive the answer. Justify your answer. Which one of the following factors does not 10th ncert chemistry 00 the valence shell? Question 4. Write its significance and limitations. Can 10th ncert chemistry 00 two structures be taken as the canonical forms of the resonance hybrid representing H3PO3?

If not, give reasons for the 10th ncert chemistry 00. Explain this on the basis of dipole moment. How does it differ from electron gain enthalpy? Write the correct Lewis structure for acetic acid. Explain why CH4 is not square planar? Describe the shapes of sp, sp2, sp3 hybrid orbitals.

Illustrate by giving one exmaple of each type. Why are the axial bonds longer as compared to equatorial bonds? Is it weaker or stronger than the van der Waals forces?

Question 5. What would be its pressure? What is the molecular mass of the oxide? When 2 g of another ideal gas B is introduced in the same flask at same temperature the pressure becomes 3 bar. Find a relationship between their molecular masses. What will be its density at STP? What is the molar mass of phosphorus? What fraction of air would have been expelled out?

Calculate the pay load when a balloon of radius 10 m, mass kg is filled with helium at 1. What is the molar mass of the gas? Calculate the partial pressure of dihydrogen. Which of these has stronger intermolecular forces and why?

Question 6. A thermodynamic state function is a quantity i used to determine heat changes ii whose value is independent of 10th ncert chemistry 00 iii used to determine pressure volume work iv whose value depends on temperature. Enthalpy of formation of CH4 g will be i � The reaction will be i possible at high temperature ii possible only at low temperature iii not possible at any temperature v possible at any temperature Question 6.

What is the change in internal energy for the process? Calculate 10th ncert chemistry 00 change for the reaction at K. Molar heat capacity of Al is 24 J mol�1 K�1.

Calculate the heat released upon formation of Question 7. The volume of the container is suddenly increased. What is Kc, for 10th ncert chemistry 00 reverse reaction? Calculate equilibrium amount of NO and Br2. At equilibrium the partial pressure of HI g is 0. What is Kp for the given equilibrium?

Is the reaction mixture at equilibrium? If not, what is the direction of the net reaction? What is the equilibrium concentration of C2H6 when it is placed in a flask at 4.

Calculate the equilibrium constant. Has equilibrium been reached? After equilibrium was attained, 10th ncert chemistry 00 of PCl5 was found to be 0.

If value of Kc is 8. Isthe reaction at equilibrium? If not in which direction does the reaction tend to proceed to reach equilibrium? If initially pure BrCl is present at a concentration of 3.

Also, mention whether change will cause the reaction to go into forward or backward direction. The first stage of two stage reaction involves the formation of CO and H2. It also contain 0. Determine the concentration of CH4 in the mixture. The equilibrium constant, Kc for the reaction 10th ncert chemistry 00 the given temperature is 3. For each case give the corresponding conjugate acid and base.

Calculate 10th ncert chemistry 00 concentration of hydrogen ion in it. Calculate the ionization constants of the corresponding conjugate base. What is the concentration of phenolate ion in 0. What will be its degree of ionization if the solution is also 10th ncert chemistry 00. Calculate the concentration of HS� ion in its 0. How will this concentration be affected if the solution is 0.

If the second dissociation constant of H2S is 1.

Thus:

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Endothermic reactions : Those reactions in which heat is absorbed are known as endothermic reactions. Question 10 Why is respiration considered an exothermic reaction? Answer: Respiration is an exothermic process because during respiration glucose combines with oxygen in the cells of our body to form carbon dioxide and water along with the production of energy.

Question 11 Why are decomposition reactions called the opposite of combination reactions? Write equations for these reactions. Answer: In a decomposition reaction, a single compound breaks down to produce two or more simpler substances. For example:. While, in a combination reaction, two or more substances simply combine to form a new substance. Question 12 Write one equation each for the decomposition reactions where energy is supplied in the form of heat, light or electricity.

OR Decomposition reactions require energy either in the form of heat or light or electricity for breaking down the reactants. Write one equation each for decomposition reactions where energy is supplied in the form of heat, light and electricity. Question 13 What is the difference between displacement and double displacement reactions? Answer: In displacement reactions, a more reactive metal displaces a less reactive metal from its solution.

In double displacement reactions, two reactants in solution exchange their ions. Question 14 In the refining of silver, the recovery of silver from silver nitrate solution involved displacement by copper metal. Write down the reaction involved.

Question 15 What do you mean by a precipitation reaction? Explain by giving examples. Answer: A reaction in which an insoluble solid called precipitate is formed that separates from the solution is called a precipitation reaction.

Question 16 Explain the following in terms of gain or loss of oxygen with two examples each: a Oxidation and b Reduction. Answer: a Oxidation : The addition of oxygen to a substance is called oxidation.

The black coloured compound is copper oxide CuO. The reaction involved is. Question 18 Why do we apply paint on iron articles? Answer: Paint does not allow iron articles to come in contact with air, water and saves iron articles from damage due to rusting. Question 19 Oil and fat containing food items are flushed with nitrogen. Answer: To keep food items fresh and save from getting oxidised, food items are flushed with nitrogen.

Question 20 Explain the following terms with one example each a Corrosion, b Rancidity. Answer: a Corrosion : It is the process in which metals are eaten up gradually by the action of air, moisture or a chemical such as an acid on their surface. Example : When iron is exposed to moist air for a long period of time, its surface acquires a coating of a brown, flaky substance called rust. Rancidity spoils the food materials prepared in fats and oils which have been kept for a considerable time and makes them unfit for eating.

Rancidity can be prevented by adding anti-oxidants to foods containing fats and oils. It can also be prevented by flushing fat and oil containing foods with nitrogen before sealing. Question 1 Which of the given statements about the reaction below are incorrect? Lead is getting reduced b. Carbon dioxide is getting oxidised c. Carbon is getting oxidised d. Lead oxide is getting reduced i a and b ii a and c iii a , b and c iv all Solution: i a and b.

Question 2 The above reaction is an example of a i. Combination reaction ii. Double displacement reaction iii. Decomposition reaction iv. Displacement reaction Solution: iv Displacement reaction. Question 3 What happens when dilute hydrochloric acid is added to iron fillings? Tick the correct answer.

Hydrogen gas and iron chloride are produced b. Chlorine gas and iron hydroxide are produced c. No reaction takes place d Iron salt and water are produced Solution: Hydrogen gas and iron chloride are produced. Solution: An equation for a chemical reaction is an equation in which the number of atoms for each element in the reaction and the total charge is the same for both the reactants and the products.

In other words, the mass and the charge are balanced on both sides of the reaction. Hydrogen gas combines with nitrogen to form ammonia b. Hydrogen sulfide gas burns in air to give water and sulfur dioxide c.

Barium chloride reacts with Aluminium sulfate to give Aluminium chloride and a precipitate of barium sulphate d. Potassium metal reacts with water to give a potassium hydroxide and hydrogen gas Solution: a. Question 6 Balance the following chemical equations. Question 8 Write the balanced chemical equation for the following and identify the type of reaction of each case.

Solution: a. Question 9 What is meant by exothermic and endothermic reactions? Solution: An exothermic reaction is one that releases heat. If 1 mole of N 2 molecule reacts with 1 mole of O 2 molecule, the heat of KJ has to be supplied to initiate the reaction to give 1 mole of NO molecule. This means that the bonds between N � N and O � O are so strong that they do not break easily. N 2 has triple covalent bond between the two N atoms. O 2 has a double covalent bond.

Thus energy has to be put into the reaction to break the strong bonds. Thus the above reaction is a good example of an endothermic reaction. Solution: During respiration, glucose combines with oxygen in the cells of our body to form carbon dioxide and water along with the production of energy. Write equations for decomposition reactions. Solution: Essentially, decomposition reactions are the opposite of combination reactions.

A compound decomposes i. Most decomposition reactions are endothermic. Another example of decomposition reaction is the heating of calcium carbonate sea shells, chalk :. Question 12 Write one equation each for decomposition reactions in which energy is supplied in the form of heat, light or electricity? Solution: When calcium carbonate is heated, it decomposes to give calcium oxide and carbon dioxide:. Write relevant equations for the above?

Solution: The difference between the displacement and double displacement reactions is that in a displacement reaction one element displaces another by virtue of it being more reactive whereas in a double displacement two anions and two cations switch places between two compounds respectively.

Thus Zn displaces Cu in the salt form. These chapter wise test papers for Class 10 Chemistry will be useful to test your conceptual understanding. Board: Central Board of Secondary Education www. All the CBSE Worksheets for Class 10 Chemistry provided in this page are provided for free which can be downloaded by students, teachers as well as by parents. So practising these worksheets will promote students problem-solving skills and subject knowledge in an interactive method.

These solutions by Chemistry experts will help you to study the different types of elements, chemical reactions and more. If you have any doubts while studying, you can ask your doubt on the TopperLearning portal. An academic expert will respond to your query within 24 hours. Enter the OTP sent to your number Change. Resend OTP. Starting early can help you score better! Avail Offer. Ok Cancel. Ok Choose Chapter.

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