Description : Name the chief factor responsible for the anomalous behavior of lithium.
Last Answer : Ans. High polarizing power (charge/size ratio).
Description : why sodium is less reactive than potassium?
Last Answer : Ans. The ionization enthalpy of potassium is less than that of sodium and the electrode potential of Potassium (-2.95 V) is more negative than that of sodium (-2.71 V) and hence sodium is less reactive than potassium.
Description : Why can caesium be used in photoelectric cell while lithium cannot ?
Last Answer : Ans. Caesium has the lowest while lithium has the highest ionization enthalpy. Hence Cs can lose electrons very easily while lithium cannot.
Description : Which of the following alkali metals has highest specific heat? (1) Caesium (2) Rubidium (3) Potassium (4) Lithium
Last Answer : Lithium
Description : what are the common physical features of alkali metals?
Last Answer : Ans. Large Atomic and ionic radii, Low ionization enthalpies, metallic character, low melting and boiling Point, form ionic bond, low density,show flame coloration ,photoelectric effect.
Description : When a cation is highly polarizing ? Which alkali metal cation has the highest polarizing power ?
Last Answer : Ans. A cation is highly polarizing if its charge/size ratio is very high.Li+ has the highest polarizing power .
Description : Name the alkali metal which forms only the normal oxide on heating with air ?
Last Answer : Ans. Li.
Description : Name the alkali metal which shows diagonal relationship with Mg?
Last Answer : Ans.Li
Description : Why is sodium metal kept under kerosene oil ?
Last Answer : Ans. Sodium metal is highly reactive and combines with air forming sodium oxide.
Description : What are the raw material used for the manufacture of washing soda by solvay process ?
Last Answer : Ans. Nacl, CaCO3 and NH3
Description : What happens when KO2 reacts with water ?
Last Answer : Ans. 2 KO2 + 2H2O ------> 2 KOH + H2O2 + O2
Description : The two elements that exist as liquids at 25°C are (a) Mercury and lithium (b) Mercury and caesium (c) Bromine and mercury (d) Mercury and argon
Last Answer : Ans:(c)
Description : The metals with very low melting points which melts by the temperature of palm are A) Sodium and potassium B) Lead and magnesium C) Aluminium and zinc D) Gallium and caesium
Last Answer : D) Gallium and caesium
Description : The material used in solar cells contains (1) Tin (2) Silicon (3) Caesium (4) Thallium
Last Answer : (2) Silicon Explanation: A solar cell (also called a photovoltaic cell) is an electrical device that converts the energy of light directly into electricity by the photovoltaic ... silicon, polycrystalline silicon, amorphous silicon, cadmium telluride, and copper iridium selenide/sulfide.
Last Answer : Silicon
Description : Which one of the following metals does not react with water to produce Hydrogen? (1) Cadmium (2) Lithium (3) Potassium (4) Sodium
Last Answer : (1) Cadmium Explanation: A cadmium metal does not react with water to produce Hydrogen.
Description : Which of the following metal has the lowest melting point? (1) Lead (2) Lithium (3) Potassium (4) Sodium
Last Answer : (3) Potassium Explanation: Here, Potassium has the lowest melting point in the given options i.e. 63.5° C. Helium has the lowest melting point of -272.2° C.
Description : Which one of the following metals does not react with water to produce Hydrogen ? (1) Potassium (2) Cadmium (3) Sodium (4) Lithium
Last Answer : (2) Cadmium Explanation: Cadmium is a soft, malleable, ductile, bluish-white divalent metal. It is similar in many respects to zinc but forms complex compounds. Unlike other metals, cadmium is ... occurs as a minor component in most zinc ores and therefore is a byproduct of zinc production.
Last Answer : Cadmium
Description : An atomic clock is based on transitions in - (1) Sodium (2) Caesium (3) Magnesium (4) Aluminium
Last Answer : (2) Caesium Explanation: An atomic clock is a clock device that uses an electronic transition frequency in the microwave, optical, or ultraviolet region of the electromagnetic spectrum of atoms ... the wave frequency of television broadcasts, and in global navigation satellite systems such as GPS.
Description : An atomic clock is based on transitions in (1) Sodium (2) Caesium (3) Magnesium (4) Aluminium
Last Answer : Caesium
Description : Why are Cs and K used as electrodes in photoelectric cells?
Last Answer : The alkali metal atoms have the largest sizes in a particular period of the periodic table. With This property makes caesium and potassium useful as electrodes in photoelectric cells.
Description : Lithium, sodium and potassium form a Dobereiner’s triad. The atomic masses of lithium and potassium are 7 and 39 respectively. Predict the atomic mass of sodium. -Science
Last Answer : Lithium, sodium and potassium form a Dobereiner's triad. The atomic masses of lithium and potassium are 7 and 39 respectively. Predict the atomic mass of sodium. Therefore, the atomic mass of sodium = average of the atomic mass of lithium and potassium = 23.
Description : Who of these has the smallest radius Lithium Oxygen Potassium or Sulfur?
Last Answer : Need answer
Description : A 55-year-old patient currently receiving other drugs for another condition is to be started on diuretic therapy for mild heart failure. Thiazides are known to reduce the excretion of (a) Diazepam (b) Fluoxetine (c) Imipramine (d) Lithium (e) Potassium
Last Answer : Ans: D
Description : What is the chemical equation for caesium plus water?
Last Answer : Feel Free to Answer
Description : Which metal among the following melts below 30^0 C. a) copper b)aluminium c)gold d)caesium
Last Answer : d)caesium
Description : Solar cells work on the principle of – (1) photovoltaic effect (2) photoelectric effect (3) photoconductive effect (4) photosynthesis
Last Answer : (1) photovoltaic effect Explanation: Solar cells work on the principle of photovoltaic effect.
Description : ROM is composed of 1) Magnetic cores 2) Micro-processors 3) Photoelectric cells 4) Floppy disks
Last Answer : 2) Micro-processors
Description : Solar cells work on the principle of (1) photovoltaic effect (2) photoelectric effect (3) photoconductive effect (4) photosynthesis
Last Answer : photovoltaic effect
Description : Which of the following scientists explained the photoelectric effect? Was it: w) Einstein x) Planck y) Bohr z) Chadwick
Last Answer : ANSWER: W -- EINSTEIN
Description : Which of the following primary cells has the highest voltage ? A. Manganese-alkaline B. Carbon-zinc C. Lithium D. Mercury
Last Answer : C. Lithium
Description : Lithium cells operates ranging from a. -25 ° C to 25 ° C b. -50 ° C to 25 ° C c. -50 ° C to 75 ° C d. -75 ° C to 75 ° C
Last Answer : c. -50 ° C to 75 ° C
Description : What is the physical condition of lithium ?
Last Answer : Silver white metal.
Description : What is the solubility of lithium ?
Last Answer : Lithium has one.
Description : What is the boiling point of lithium ?
Last Answer : Lithium has a boiling point of 1340 degrees Celsius.
Description : What is the melting point of lithium ?
Last Answer : Lithium has a melting point of 179 degrees Celsius.
Description : What is the relative atomic mass of lithium ?
Last Answer : The relative atomic mass of lithium is seven.
Description : What are the advantages and disadvantages of LED storage cell and lithium ion batteries ?
Last Answer : Although both cells are rechargeable, lithium ion batteries have higher recharge efficiency. Due to this its use as an alternative to commercial led storage cell is increasing. Light Li / C anode and ... LiOH and H2, gases that are dangerous. LIB costs more than Ni-Cd rechargeable batteries .
Description : What is Lithium Ion Battery ( LIB) ?
Last Answer : Lithium-ion battery ( LIB) is a rechargeable battery. In this the Li + ion is transferred from the anode to the cathode during discharge and the same Li + ion from the cathode to the ... added ( Li +) graphite rod anode. Nowadays, its efficiency in applying nanotechnology has been greatly enhanced.
Description : What is the symbol of lithium ?
Last Answer : Lithium symbolizes Li
Description : What is the sign of lithium ?
Last Answer : : Likhiam's signal Li.
Description : The element with highest first ionization energy is - (1) hydrogen (2) helium (3) lithium (4) sodium
Last Answer : (2) helium Explanation: The first ionisation energy is the energy required to remove the most loosely held electron from one mole of gaseous atoms to produce 1 mole of gaseous ions each with a charge of ... ) of Hydrogen: around 1200: Helium: about 2500; Lithium: about 500; and Sodium: about 500.
Description : Which one of the following is the softest (1) sodium (2) iron (3) aluminium (4) lithium
Last Answer : (1) sodium Explanation: lightest-lithium, heaviestosmium, hardest-tungsten, soft metal- sodium.
Description : Which one of the following elements exhibits the greatest tendency to lose electrons? (1) Fluorine (2) Lithium (3) Oxygen (4) Zine
Last Answer : (2) Lithium Explanation: Alkali metals such as Lithium are the most electropositive elements in the periodic table. As alkali metals have low ionization energies, they have a great tendency to lose electrons forming unipositive ions.
Description : How do you account for the strong reducing power of lithium in aqueous solution?
Last Answer : Ans.Electrode potential is a measure of the tendency of an element to lose electrons in the aq.solution .It depends upon following factors : (i)Sublimation enthalpy. (II)Ionisation enthalpy (iii) ... hydration.Thus Li has the most negative E0 Value and hence lithium is the strongest reducing agent.
Description : In what ways lithium shows similarities to magnesium in its chemical behavior?
Last Answer : Ans. (a) the hydroxides of both lithium and Mg decompose on heating (b) Both form ionic nitrides when heated in an atmosphere of nitrogen. (C) The carbonates of both Li and Mg decompose on heating
Description : Mention the Points of Similarities between ‘Lithium and Magnesium’
Last Answer : The similarity between lithium and magnesium is particularly striking and arises because of their similar sizes : (atomic radii, Li = 152 pm, Mg = 160 pm; ionic radii : Li+ = 76 ... Both LiCl and MgCl2 are deliquescent and crystallise from aqueous solution as hydrates, LiCl·2H2O and MgCl2·8H2O.
Description : Mention the Points of Difference between ‘Lithium and other Alkali Metals’
Last Answer : (i) Lithium is much harder. Its m.p. and b.p. are higher than the other alkali metals. (ii) Lithium is least reactive but the strongest reducing agent among all the alkali metals. ... and Li2O are comparatively much less soluble in water than the corresponding compounds of other alkali metals.
Description : Lithium and beryllium, shows similarity with which elements .
Last Answer : Lithium shows similarities to magnesium and beryllium to aluminium in many of their properties. This type of diagonal similarity is commonly referred to as diagonal relationship in the periodic table.