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

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
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Why can caesium be used in photoelectric cell while lithium cannot ?

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.

Why are potassium and caesium, rather than lithium used in photoelectric cells ?

Description : Why are potassium and caesium, rather than lithium used in photoelectric cells ?

Last Answer : Ans. Potassium and caesium have much lower ionization enthalpy than that of lithium. As a result, these metals on exposure to light, easily emit electrons but lithium does not. Therefore, K and Cs rather than Li are used in photoelectric cells

Which of the following alkali metals has highest specific heat? (1) Caesium (2) Rubidium (3) Potassium (4) Lithium

Description : Which of the following alkali metals has highest specific heat? (1) Caesium (2) Rubidium (3) Potassium (4) Lithium

Last Answer : Lithium

In which of the following groups, are the elements written in the descending order of their respective atomic weights? (a) Nitrogen, carbon, oxygen, hydrogen (b) Oxygen, argon, nitrogen, hydrogen (c) Oxygen, nitrogen, helium, hydrogen (d) Oxygen, nitrogen, helium, bromine

Description : In which of the following groups, are the elements written in the descending order of their respective atomic weights? (a) Nitrogen, carbon, oxygen, hydrogen (b) Oxygen, argon, nitrogen, hydrogen (c) Oxygen, nitrogen, helium, hydrogen (d) Oxygen, nitrogen, helium, bromine

Last Answer : Ans:(c)

Which are the only two elements on the periodic table that are liquid at room temperature? A. Mercury and Bromine (Answer) B. Carbon and helium C. Nitrogen and Hydrogen D. Oxygen and Neon

Description : Which are the only two elements on the periodic table that are liquid at room temperature? A. Mercury and Bromine (Answer) B. Carbon and helium C. Nitrogen and Hydrogen D. Oxygen and Neon

Last Answer : A. Mercury and Bromine (Answer)

Which among the following is not a noble gas? (a) Argon (b) Radon (c) Neon (d) Bromine

Description : Which among the following is not a noble gas? (a) Argon (b) Radon (c) Neon (d) Bromine

Last Answer : Ans:(d)

Are argon in bromine similar?

Description : Are argon in bromine similar?

Last Answer : Need answer

What is the only non-metal element that is a liquid at room temperature and one atmosphere? w) bromine x) argon y) silicon z) selenium

Description : What is the only non-metal element that is a liquid at room temperature and one atmosphere? w) bromine x) argon y) silicon z) selenium

Last Answer : ANSWER: W -- BROMINE

A common fluorescent tube contains (a) sodium vapour (b) argon at low pressure (c) mercury vapour at low pressure (d) mercuric oxide and neon

Description : A common fluorescent tube contains (a) sodium vapour (b) argon at low pressure (c) mercury vapour at low pressure (d) mercuric oxide and neon

Last Answer : Ans:(c)

The most commonly used substances in fluorescent tubes are (a) sodium oxide and argon (b) sodium vapour and neon (c) mercury vapour and argon (d) mercuric oxide and neon

Description : The most commonly used substances in fluorescent tubes are (a) sodium oxide and argon (b) sodium vapour and neon (c) mercury vapour and argon (d) mercuric oxide and neon

Last Answer : Ans:(c)

What is the most commonly used substance in fluorescent tubes? (1) Sodium oxide and argon (2) Sodium vapour and neon (3) Mercury vapour and argon (4) Mercury oxide and neon

Description : What is the most commonly used substance in fluorescent tubes? (1) Sodium oxide and argon (2) Sodium vapour and neon (3) Mercury vapour and argon (4) Mercury oxide and neon

Last Answer : (3) Mercury vapour and argon Explanation: A fluorescent lamp or fluorescent tube is a gas-discharge lamp that uses electricity to excite mercury vapour. it contains mercury vapour and ... A fluorescent lamp converts electrical power into useful light more efficiently than an incandescent lamp.

What is the most commonly used substance in fluorescent tubes? (1) Sodium oxide and argon (2) Sodium vapour and neon (3) Mercury vapour and argon (4) Mercury oxide and neon

Description : What is the most commonly used substance in fluorescent tubes? (1) Sodium oxide and argon (2) Sodium vapour and neon (3) Mercury vapour and argon (4) Mercury oxide and neon

Last Answer : Mercury vapour and argon

Which of the following primary cells has the highest voltage ? A. Manganese-alkaline B. Carbon-zinc C. Lithium D. Mercury

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

Which of the given nonmetal is a liquid? A) Hydrogen B) Bromine C) Chlorine D) Mercury

Description : Which of the given nonmetal is a liquid? A) Hydrogen B) Bromine C) Chlorine D) Mercury

Last Answer : B) Bromine

Which one of the following substances does not have a melting point? (1) Bromine (2) Sodium chloride (3) Mercury (4) Glass

Description : Which one of the following substances does not have a melting point? (1) Bromine (2) Sodium chloride (3) Mercury (4) Glass

Last Answer : (3) Mercury Explanation: The boiling point is the temperature at which a material changes from a liquid to a gas (boils) while the melting point is the temperature at which a material changes from a solid to a liquid (melts).

Which among the following is liquid non-metal? (1) Mercury (2) Bromine (3) Water (4) Alcohol

Description : Which among the following is liquid non-metal? (1) Mercury (2) Bromine (3) Water (4) Alcohol

Last Answer : (2) Bromine Explanation: Bromine, a non-metal of halogen group, is found in liquid state. Mercury is a metal. Water and alcohol are compounds

Which among the following is liquid non-metal ? (1) Mercury (2) Bromine (3) Water (4) Alcohol

Description : Which among the following is liquid non-metal ? (1) Mercury (2) Bromine (3) Water (4) Alcohol

Last Answer : Bromine

Example of non-metal which exist in solid state is __________ . a) sulphur b)bromine c)chlorine d)oxygen

Description : Example of non-metal which exist in solid state is __________ . a) sulphur b)bromine c)chlorine d)oxygen

Last Answer : a) sulphur

Which of the following liquids has the least density? (1) Fresh water (2) Salt water (3) Petrol (4) Mercury

Description : Which of the following liquids has the least density? (1) Fresh water (2) Salt water (3) Petrol (4) Mercury

Last Answer : (3) Petrol Explanation: Gasoline or petrol is a transparent, petroleum-derived liquid that is used primarily as a fuel in internal Combustion engines. It consists mostly of organic compounds obtained by the fractional distillation of petroleum, enhanced with a variety of additives.

On all instruments like measuring cylinder, pipette and burette, readings are always taken at the bottom of the meniscus of liquid. This is not true for liquids like A. Oil B. Ink C. Mercury D. Seawater

Description : On all instruments like measuring cylinder, pipette and burette, readings are always taken at the bottom of the meniscus of liquid. This is not true for liquids like A. Oil B. Ink C. Mercury D. Seawater

Last Answer : Mercury

Zinc is most soluble in which of the following liquids? w) Water x) Alchohol y) Mercury z) Oil

Description : Zinc is most soluble in which of the following liquids? w) Water x) Alchohol y) Mercury z) Oil

Last Answer : ANSWER: Y -- MERCURY

Which of the following liquids has the least density ? (1) Fresh water (2) Salt water (3) Petrol (4) Mercury

Description : Which of the following liquids has the least density ? (1) Fresh water (2) Salt water (3) Petrol (4) Mercury

Last Answer : Petrol

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

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

What is the chemical equation for caesium plus water?

Description : What is the chemical equation for caesium plus water?

Last Answer : Feel Free to Answer

An atomic clock is based on transitions in - (1) Sodium (2) Caesium (3) Magnesium (4) Aluminium

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.

The material used in solar cells contains (1) Tin (2) Silicon (3) Caesium (4) Thallium

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.

Which metal among the following melts below 30^0 C. a) copper b)aluminium c)gold d)caesium

Description : Which metal among the following melts below 30^0 C. a) copper b)aluminium c)gold d)caesium

Last Answer : d)caesium

The material used in solar cells contains (1) Tin (2) Silicon (3) Caesium (4) Thallium

Description : The material used in solar cells contains (1) Tin (2) Silicon (3) Caesium (4) Thallium

Last Answer : Silicon

An atomic clock is based on transitions in (1) Sodium (2) Caesium (3) Magnesium (4) Aluminium

Description : An atomic clock is based on transitions in (1) Sodium (2) Caesium (3) Magnesium (4) Aluminium

Last Answer : Caesium

Immiscible liquids: w) are not mutually soluble x) dissolve in each other y) dissolve in more than one liquid z) are unstable and chemically react e) do not exist

Description : Immiscible liquids: w) are not mutually soluble x) dissolve in each other y) dissolve in more than one liquid z) are unstable and chemically react e) do not exist

Last Answer : ANSWER: W -- ARE NOT MUTUALLY SOLUBLE

There are two elements calcium (atomic number 20) and argon (atomic number 18) The mass number of both the elements is 40. They are therefore known as (a) isotones (b) isochores (c) isobars (d) isotopes

Description : There are two elements calcium (atomic number 20) and argon (atomic number 18) The mass number of both the elements is 40. They are therefore known as (a) isotones (b) isochores (c) isobars (d) isotopes

Last Answer : Ans:(c)

Which element forms compounds with all others elements except except helium neon and argon?

Description : Which element forms compounds with all others elements except except helium neon and argon?

Last Answer : i believe the answer is flourine.

Which of the following elements is obtained from the sea algae? (1) Argon (2) Sulphur (3) Vanadium (4) Iodine

Description : Which of the following elements is obtained from the sea algae? (1) Argon (2) Sulphur (3) Vanadium (4) Iodine

Last Answer : (4) Iodine Explanation: Fusus vesiculosus is a brown seaweed and is also known as bladder wrack or red algae, according to the National Institutes of Health (NTH). Red marine algae ... dietary supplements. The high iodine content in red marine algae can lead to hypothyroidism or hyperthyroidism.

Which one of the following elements is polyatomic? (1) Argon (2) Sodium (3) Sulphur (4) Oxygen

Description : Which one of the following elements is polyatomic? (1) Argon (2) Sodium (3) Sulphur (4) Oxygen

Last Answer : (3) Sulphur Explanation: The term polyatomic is used for a molecule or an ion which contains either two or more than two atoms.

Which of the following elements is obtained from sea weeds? (1) Iodine (2) Vanadium (3) Argon (4) Sulphur

Description : Which of the following elements is obtained from sea weeds? (1) Iodine (2) Vanadium (3) Argon (4) Sulphur

Last Answer : (1) Iodine Explanation: Seaweed is rich in iodine, a trace element essential for healthy thyroid function and a healthy metabolism. Iodine is particularly vital for pregnant and lactating women. Seaweed also contains zinc and anti-okidants, which help strengthen immunity.

Which of the following elements is obtained from sea weeds? (1) Argon (2) Sulphur (3) Vanadium (4) Iodine

Description : Which of the following elements is obtained from sea weeds? (1) Argon (2) Sulphur (3) Vanadium (4) Iodine

Last Answer : (4) Iodine Explanation: Ribbon seaweeds(sp. laminaria) contain iodine compounds which they obtain by extracting iodide ions from seawater.

Which of the following elements is found in the earth's crust as both a native element and as a compound? w) argon x) copper y) chlorine z) silicon

Description : Which of the following elements is found in the earth's crust as both a native element and as a compound? w) argon x) copper y) chlorine z) silicon

Last Answer : ANSWER: X -- COPPER

Which of the following elements does not normally occur as a diatomic molecule? w) hydrogen x) chlorine y) argon z) oxygen

Description : Which of the following elements does not normally occur as a diatomic molecule? w) hydrogen x) chlorine y) argon z) oxygen

Last Answer : ANSWER: Y -- ARGON

Which of the following elements has the highest first ionization energy? w) Helium x) Neon y) Fluorine z) Argon

Description : Which of the following elements has the highest first ionization energy? w) Helium x) Neon y) Fluorine z) Argon

Last Answer : ANSWER: W -- HELIUM

Which of the following elements is obtained from the sea algae ? (1) Argon (2) Sulphur (3) Vanadium (4) Iodine

Description : Which of the following elements is obtained from the sea algae ? (1) Argon (2) Sulphur (3) Vanadium (4) Iodine

Last Answer : Iodine

Which of the following elements is obtained from sea weeds ? (1) Iodine (2) Vanadium (3) Argon (4) Sulphur

Description : Which of the following elements is obtained from sea weeds ? (1) Iodine (2) Vanadium (3) Argon (4) Sulphur

Last Answer : Iodine

Which one of the following elements exhibits the greatest tendency to lose electrons? (1) Fluorine (2) Lithium (3) Oxygen (4) Zine

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.

Lithium and beryllium, shows similarity with which elements .

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. 

Which of the following elements has the highest electronegativity? w) Lithium x) Iodine y) Cesium z) Oxygen

Description : Which of the following elements has the highest electronegativity? w) Lithium x) Iodine y) Cesium z) Oxygen

Last Answer : ANSWER: D -- OXYGEN

Which one of the following elements exhibits the greatest tendency to lose electrons ? (1) Fluorine (2) Lithium (3) Oxygen (4) Zinc

Description : Which one of the following elements exhibits the greatest tendency to lose electrons ? (1) Fluorine (2) Lithium (3) Oxygen (4) Zinc

Last Answer : Lithium

The molar volume of which two elements is the same at standard temperature and pressure? w) fluorine and bromine x) fluorine and iodine y) fluorine and chlorine z) bromine and iodine

Description : The molar volume of which two elements is the same at standard temperature and pressure? w) fluorine and bromine x) fluorine and iodine y) fluorine and chlorine z) bromine and iodine

Last Answer : ANSWER: Y -- FLUORINE AND CHLORINE

How is bromine separated from other elements?

Description : How is bromine separated from other elements?

Last Answer : Need answer

Which one of the following elements is associated with teeth disorder? (1) Chlorine (2) Fluorine (3) Bromine (4) Iodine

Description : Which one of the following elements is associated with teeth disorder? (1) Chlorine (2) Fluorine (3) Bromine (4) Iodine

Last Answer : (2) Fluorine Explanation: Fluorine is the element that is associated with teeth disorder because the presence of sodium fluoride in drinking water at the level of 2 ppm may cause mottled enamel ... , topically applied fluoride (toothpaste, dental rinses) has been shown to help reduce dental caries.

Which of the following elements has the lowest melting point? (1) Bromine (2) Zinc (3) Calcium (4) Lead

Description : Which of the following elements has the lowest melting point? (1) Bromine (2) Zinc (3) Calcium (4) Lead

Last Answer : (1) Bromine Explanation: Bromine is a chemical element with symbol Br and atomic number 35. Thus, the melting and boiling points of bromine are intermediate between those of chlorine and iodine.

Which of the following elements would form a covalent bond with Bromine? w) Calcium x) Aluminum y) Oxygen z) Tin

Description : Which of the following elements would form a covalent bond with Bromine? w) Calcium x) Aluminum y) Oxygen z) Tin

Last Answer : ANSWER: Y -- OXYGEN