∴ Oxidation state of sodium = + 1. The elements potassium, sodium, lithium and calcium are very reactive and they react with cold water to produce hydroxides and hydrogen gas. Gold and copper c. Sodium and iron d. Zinc and copper e. Copper and zinc f. Iron and zinc g. How can francium be extracted from francium oxide? Question 10.5. Q1 :Explain why is sodium less reactive than potassium? Secondly, on moving down the group, the atomic size increases and the effective nuclear charge decreases. Sodium is a chemical element with the symbol Na (from Latin "natrium") and atomic number 11. (c) Aluminium metal forms a thin layer of aluminium oxide all over its surface under the action of moist air. State two defects in Mendeleev’s periodic table For the main groups of the periodic table, the metallic properties of the elements vary approximately with their position as shown in the chart below. Find out the oxidation state of sodium in Na 2 O 2. This is mainly due to high ionisation enthalpy of sodium as compared to potassium. This shows that sodium is more reactive than zinc. It also reacts with water more violently than sodium. Sodium is less reactive than potassium because ionization enthalpy of K is 419 kJ mol-1. The elements magnesium, aluminium and iron are also considered as active metals and they react with steam to produce oxides and hydrogen gas. Answer: Reactivity in alkali metals is related to the tendency to lose electrons from the valence shell. As we move from top to bottom, the reactivity of metallic elements of Group IA increases. HCl and cone. Active 4 years ago. NCERT Solutions for Class 10 Science Chapter 3 – Metals and Non-metals. You will not be allowed to write during the first 15 minutes. Sodium, potassium and lithium … The reactivity series of metals is a chart listing metals in order of decreasing reactivity. Question 5. What more information would you need before you could say how aluminium should be extracted from aluminium oxide? So, (ii) Zn is more reactive than Fe, so it displaces iron as follows: Metals and nonmetals class 10 Question 5. Question 5. B. zinc has higher melting point than tin C. zinc is more reactive than tin D. zinc is less reactive than tin. Hence it is less reactive than potassium. As sodium and potassium both are alkali metals that belong to Group IA of the periodic table. Explain why potassium is more reactive than sodium, giving the balanced chemical symbol equation for the reaction of potassium and water. Because of these factors, the outermost electron in potassium can be lost easily as compared to sodium. Potassium has lower ionization enthalpy (496 kJ/mol) than sodium (520 kJ /mol). Question 10.5: Explain why is sodium less reactive than potassium? It follows, therefore, that this outermost electron is more easily lost than it is in sodium, so potassium can be converted to ionic form more readily than sodium. Therefore, potassium is more electropositive and a stronger reducing agent than sodium. Solution. Potassium and Lithium are metals and they have the tendency to loose electrons.Lithium is smaller in size than potassium . Solution 2 Show Solution. Now try these: For the element pairs below, state which is more reactive and which is less reactive. Answer: It is because ionization enthalpy ∆H i of potassium = 419 kJ mol -1. : (C) zinc is more reactive than tin and reacts with organic acids present in food to form poisonous compounds. i.e., A is more reactive than copper. Example, Lithium, sodium and Potassium. Aluminium is more reactive than zinc, but less reactive than magnesium. a. Calcium and lithium b. Explain why these sour substances are effective in cleaning the vessels. Posted on February 20, 2021 by — Leave a comment why is potassium more reactive than lithium gcse 2 mL each of cone. (b) Sodium, potassium and lithium are stored under oil to prevent their reaction with oxygen moisture and carbon dioxide of air so as to protect them as they are highly reactive metals. Solution: NCERT CBSE Solutions for Class 10 Science Chapter 3 . Answer: This is mainly due to higher ionisation enthalpy (Δ i H 1 = 496 kJ mol-1) of sodium as compared to potassium (A,H- = 419 kJ mol-1). SOLUTION: Ans. Explain why potassium is more reactive than lithium and chlorine less reactive than fluorine. As we move down the table in Group 1 elements, the effect of nuclear charge gets decreased as the size of the atom increases. Q:-Explain the terms Inductive and Electromeric effects. Concise Chemistry Part II - Selina Solutions for Class 10 Chemistry ICSE, 1 Periodic Table, Periodic Properties and Variations of Properties. Q:-Calculate the amount of carbon dioxide that could be produced when (i) 1 mole of carbon is burnt in air. So, (ii) Zn is more reactive than Fe, so it displaces iron as follows: Metals and nonmetals class 10 Question 5. Explain why is sodium less reactive than potassium. HCl and cone. Explain why is sodium less reactive than potassium. Since the reaction of sodium with water is highly exothermic, it catches fire when put in water. A more reactive metal will displace a less reactive metal from a compound. You are given a hammer, a battery, a bulb, wires and a switch : A. The metals above hydrogen are more reactive than hydrogen. Q 20. Hence, potassium is more reactive than sodium. Explain why is sodium less reactive than potassium. (i) Fe is less reactive than zinc. Question 2. Use the reactivity series above to help you. Since Ionization enthalpy of potassium is less than that of sodium, potassium is more reactive than sodium… Explain why is sodium less reactive than potassium. Ionization enthalpy of sodium = 496 kJ mol-1. Hence, sodium is less reactive than potassium. All the solutions of Periodic Table, Periodic Properties and Variations of Properties - Chemistry explained in detail by experts to … Metals that are more reactive than hydrogen displace it from dilute acids. Recently Viewed Questions of Class Chemistry. Q. Question 5. Download free PDFs of NCERT Solutions Class 10 Science Chapter 5 Periodic Classification Of Elements prepared by expert teachers at BYJU'S. Class 11. Therefore it will lose electrons less readily as compared to potassium. Click here to get Class 10 … 67. Explain why is sodium less reactive than potassium? Solution. Question 6. So, therefore, the outermost electron of potassium is easily removed. Because of these factors, the outermost electron in potassium can be lost easily as compared to sodium. the masses of the atoms and the neutrons are as follows: 21h = 2.0140 amu 31h = 3.01605 amu 42he = 4.002603 amu 10n = 1.008665 amu. (b) Aluminium is reactive and forms an oxide layer on its surface when comes to contact with air. (i) Fe is less reactive than zinc. Hence, potassium is more reactive than sodium. This makes Potassium more reactive as the outer electron can be easily lost when compared to Sodium. Sodium has 3 shells while potassium has 5. so valence electrons are more tightly held in Li than K. Due to larger size of K the valence electrons are loosely held and easy to remove the electron from K.Hence K is more reactive. HNO3 and a mixture of cone. B + FeSO 4 → Displacement, i.e., B is more reactive than iron. Hence, lithium reacts slowly while sodium reacts vigorously with water. Since Ionization enthalpy of potassium is less than that of sodium, potassium is more reactive than sodium. It is a soft, silvery-white, highly reactive metal.Sodium is an alkali metal, being in group 1 of the periodic table. Previous Question Next Question. This time is to be spent in … ICSE Chemistry Previous Year Question Paper 2013 Solved for Class 10 ICSE Paper 2013 CHEMISTRY (Two Hours) Answers to this Paper must be written on the paper provided separately. Answer 10.5: In alkali metals, on moving down the group, the atomic size increases and the effective nuclear charge decreases. Solution: (a)In order to prevent rusting iron grill is painted frequently. Popular Questions of Class Chemistry. This is because sodium is less reactive than potassium so cannot displace it. Answer : In alkali metals, on moving down the group, the atomic size increases and the effective nuclear charge decreases. 2 mL each of cone. Rusting is an oxidation reaction. Answer: Because ionisation enthalpy of sodium is higher than that of potassium. The reactivity series allows us to predict how metals will react. Explain why this rock cannot be called an Ore 65. HNO 3 in the ratio of 3 : 1 were taken in test tubes labelled as A, B and C. A small piece of metal was put in each test tube. Question 10.5 Explain why is sodium less reactive than potassium . Why is potassium highly reactive than the sodium? As a result, the potassium is more electropositive and stronger reducing agent than sodium. The ionization potential of sodium is lower than that of lithium as sodium is a larger atom compared to lithium. Question 5. Answer: It is because ionization enthalpy ∆H i of potassium = 419 kJ mol -1. Explain why is sodium less reactive than potassium. Hence, potassium is more reactive than sodium. Francium is more reactive than lithium. Thus, sodium having lower ionization enthalpy is more reactive than lithium. The standard reduction potential of potassium (-2.925 V) is more negative than that of sodium (-2.714 V). Class 10 Science Chapter 5 Extra Questions and Answers Periodic Classification of Elements. HNO 3 and a mixture of cone. Explain why sodium is less reactive than potassium. Answer. Explain why these sour substances are effective in cleaning the vessels. Hence, potassium is more reactive than sodium. Ionization enthalpy of sodium = 496 KJ mol. HNO3 in the ratio of 3 : 1 were taken in test tubes labelled as A, B and C. A small piece of metal was put in each test tube. Its only stable isotope is 23 Na. Thus, the ease with which K loses an electron is higher than the ease with which Na loses an electron. Chapter 3 – Metals and Non-metals. (b) Explain why, though aluminium is more reactive than iron, yet there is less corrosion of aluminium when both are exposed to air. Question 24: Sodium is more reactive than lithium. Question 10.6 Ionization enthalpy of sodium = 496 KJ mol. (v Hence, ionization enthalpy of potassium is less than that of sodium, potassium is more reactive than sodium. They have one valence electron in their valence shell. 66. HCl, cone. Home / Uncategorized / why is potassium more reactive than lithium gcse. Find best tutors for Class 11 Tuition Classes by posting a requirement. Answer : As we know that in alkali metals, as we go down the group the atomic size increases and also the effective nuclear charge decreases. The free metal does not occur in … Explain. The size of X is more than Y because size of the atom decreases on moving from left to right in a period. HCl, cone.
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