Description : Teeth and Bones acquire strength and rigidity from (1) Calcium (2) Fluorine (3) Chlorine (4) Sodium
Last Answer : Calcium
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.
Description : Which one of the following elements is associated with teeth disorder ? (1) Chlorine (2) Fluorine (3) Bromine (4) Iodine
Last Answer : Fluorine
Description : Fluorine is-an important trace element for the growth of : (a) Hair (b) Teeth (c) Mucsles (d) Bones
Last Answer : (b) Teeth
Description : The most electronegative element among the following is – (1) Fluorine (2) Sodium (3) Chlorine (4) Oxygen
Last Answer : (1) Fluorine Explanation: Electronegativity of the elements using the Pooling Scale is as follows: Fluorine: 3.98, Oxygen: 3.44, Chlorine: 3.16, and Sodium: 0.93. Electronegativity increases down the group and decreases down the period.
Description : The most electronegative element among the following is (1) Fluorine (2) Sodium (3) Chlorine (4) Oxygen
Description : The main chemical substance present in the bones and teeth of animals is: A. Sodium Chloride B. Sugar C. Calcium Phosphate D. Calcium sulphate
Last Answer : ANSWER: C
Description : The main chemical substance present in the bones and teeth of animal is (a) sodium chloride (b) sugar (c) calcium phosphate (d) calcium sulphate
Last Answer : Ans:(c)
Description : What is the same about fluorine chlorine bromine and iodine?
Last Answer : They have many similarities, which is why we put them all into the same Periodic Table group. Here is a brief list:They are diatomic.They are coloured.They are oxidising agents.They react with hydrogen.They react with metals.
Description : How many valence electrons are in the element fluorine and do the same for chlorine and bromine?
Last Answer : The number of valence electrons is seven.
Description : What Element Would Be Least Reactive Out Of Chlorine Iodine Bromine And Fluorine?
Last Answer : Feel Free to Answer
Description : Which of the following does not belong to the halogen family? (a) Chlorine (b) Fluorine (c) Bromine (d) Morphine
Last Answer : Ans:(d)
Description : Seaweeds are important source of – (1) fluorine (2) chlorine (3) bromine (4) iodine
Last Answer : (4) iodine Explanation: Seaweed is a source of iodine, necessary for thyroid function and to prevent goitre. However, an excess of iodine is suspected in the heightened cancer risk in Japanese who consume a lot of the plant.
Description : The most reactive among the halogens is (1) Fluorine (2) Chlorine (3) Bromine (4) Iodine
Last Answer : (1) Fluorine Explanation: Fluorine is one of the most reactive elements in existence, attacking otherwise inert materials such as glass, and forming compounds with the heavier noble gases. It is a ... react with glass in the presence of small amounts of water to form silicon tetrafluoride (SiF4).
Description : The strongest oxidizing agent among the following is: (1) Chlorine (2) Iodine (3) Fluorine (4) Oxygen
Last Answer : (3) Fluorine Explanation: An oxidizing agent is a chemical species that removes an electron from another species. Fluorine, having the largest positive value of electrode potential, is the strongest ... all halogens have a tendency to take up electrons and thus act as strong oxidizing agents.
Description : Which one of the following does not form oxyacid? (1) Sulphur (2) Chlorine (3) Nitrogen (4) Fluorine
Last Answer : (4) Fluorine Explanation: Fluorine cannot form oxyacid because fluorine is more electronegative than oxygen. For oxygen to bind, it must be a positively charged ion.
Description : The non-metal found in the liquid state is – (1) bromine (2) nitrogen (3) fluorine (4) chlorine
Last Answer : (1) bromine Explanation: Bromine belongs to the halogen group. It is the only non-metal element that is in a liquid form at room temperature. At room temperature it is a reddish brown fuming liquid with an unpleasant chlorine like smell.
Description : A gas used as a disinfectant in drinking water is - (1) Hydrogen (2) Oxygen (3) Fluorine (4) Chlorine
Last Answer : (4) Chlorine Explanation: Water chlorination is the process of adding chlorine or chlorine compounds such as sodium hypochlorite to water.
Description : The most reactive among the halogens is - (1) Fluorine (2) Chlorine (3) Bromine (4) Iodine
Last Answer : (1) Fluorine Explanation: As a general rule, fluorine is the most reactive halogen and astatine is the least reactive. All halogens form Group 1 salts with similar properties.
Description : Out of the following, copper vessels are the most suitable for the storage of (A) Bromine (B) Dry chlorine & dry fluorine (C) Nitric acid (95% and fuming) (D) Phosphoric acid (95%) & sulphuric acid (95% and fuming)
Last Answer : (B) Dry chlorine & dry fluorine
Description : Why is fluorine (F2) more reactive than chlorine (Cl2)?
Last Answer : Ans. F2 is more reactive than Cl2 due to greater repulsion in the non-bonded electron pairs in the molecule of F2 as compared to Cl2 therefore the bond cleavage in fluorine becomes easier.
Description : Sea weeds are an important source of (A) Fluorine (B) Chlorine (C) Bromine (D) Iodine
Last Answer : (D) Iodine
Description : Which halogen does not appreciably react with methane in a free-radical substitution reaction? (a) chlorine (b) bromine (c) iodine (d) fluorine
Last Answer : iodine
Description : Which element in chlorofluorocarbons (CFCs) is responsible for destroying the Earth's ozone layer? w) oxygen x) fluorine y) chlorine z) bromine
Last Answer : ANSWER: Y -- CHLORINE
Description : Which of the following has the smallest atomic radius? w) iodine x) chlorine y) fluorine z) bromine
Last Answer : ANSWER: Y -- FLUORINE
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
Description : Which of the following halogens does NOT replace the other halogens from their compounds? w) fluorine x) iodine y) bromine z) chlorine
Last Answer : ANSWER: X -- IODINE
Description : The non-metal found in the liquid state is (1) bromine (2) nitrogen (3) fluorine (4) chlorine
Last Answer : bromine
Description : Which one of the following does not form oxyacid ? (1) Sulphur (2) Chlorine (3) Nitrogen (4) Fluorine
Description : Seaweeds are important source of (1) fluorine (2) chlorine (3) bromine (4) iodine
Description : Fluorosis is caused due to (A) Excessive intake of fluorine (B) Low intake of fluorine (C) Discoloration of the teeth due to low intake (D) All of these
Last Answer : Answer : A
Description : . In a linear polymer, the monomeric units are linked together to form long straight chains. The cross linked or branched chain polymers compared to linear polymers have higher (A) Densities (B) Melting point (C) Tensile strength (D) Hardness, rigidity & brittleness
Last Answer : (D) Hardness, rigidity & brittleness
Description : The keyway, (A) Reduces strength of shaft (B) Reduces rigidity of shaft (C) Increases stress concentration (D) All of above
Last Answer : (D) All of above
Description : The shafts will have same strength on the basis of torsional rigidity, if (A) Diameter and length of both shafts is same (B) Material of both shafts is same (C) Angle of twist for both shafts is same (D) All of above conditions are satisfied
Last Answer : (D) All of above conditions are satisfied
Description : Pick up the incorrect statement (A) The cross-sectional area of the welded member is effective (B) A welded joint develops strength of its parent metal (C) Welded joints provide rigidity (D) Welding takes more time than riveting
Last Answer : (D) Welding takes more time than riveting
Description : Polymerization helps to improve the property of (A) Strength (B) Rigidity (C) Elasticity (D) All of these
Last Answer : Answer: Option D
Description : What Properties Are Needed To Be Considered For Application Calling For Following Requirements? I) Rigidity. Ii) Strength Of No Plastic Deformation Under Static Load. Iii) Strength To Withstand Overload Without Fracture.
Last Answer : i) Reliability – elastic modulus and yield strength. ii) Strength (for no plastic deformation under static loading) – yield point. iii) Strength (overload) – Toughness and impact resistance. iv) Wear resistance – Hardness. v) Reliability and safety – Endurance limit and yield.
Description : What is the function of gypsum-binder in the investment:** A. Setting and hydroscopic B. Strength and rigidity
Last Answer : B. Strength and rigidity
Description : The shafts will have same strength on the basis of torsional rigidity, if (a) diameter and length of both shafts is same (b) material of both shafts is same (c) angle of twist for both shafts is same (d) all of above conditions are satisfied
Last Answer : (d) all of above conditions are satisfied
Description : .The shafts are designed on the basis of (a) Rigidity (b) Strength (c) Both of these (d) Either of these
Last Answer : (c) Both of these
Description : Strength of a shaft a. Is equal to maximum shear stress in the shaft at the time of elastic failure b. Is equal to maximum shear stress in the shaft at the time of rupture c. Is equal to torsional rigidity d. Is ability to resist maximum twisting moment
Last Answer : d. Is ability to resist maximum twisting moment
Description : The shafts are designed on the basis of a. strength and rigidity. b. ductility. c. malleablility. d. resilience.
Last Answer : a. strength and rigidity.
Description : The most electronegative element among sodium, bromium, fluorine and oxygen is (a) Sodium (b) Bromium (c) Fluorine (d) Oxygen
Description : Atomic number of which of the following elements is greater than that of Fluorine? (1) Sodium (2) Beryllium (3) Nitrogen (4) Boron
Last Answer : (1) Sodium Explanation: Sodium has higher atomic number (11) than Fluorine (9) The atomic number of Beryllium and Nitrogen are 4 and 7 respectively.
Description : The most electronegative element among the following is - (1) sodium (2) bromine (3) fluorine (4) oxygen
Last Answer : (3) fluorine Explanation: Fluorine is the most electronegative element, while francium is one of the least electronegative.
Description : What is the formula for the compound that is formed from Sodium and Fluorine?
Last Answer : ANSWER: NaF
Description : Which of the following elements gains electrons most readily? w) Sodium x) Magnesium y) Aluminum z) Fluorine
Last Answer : ANSWER: D -- FLUORINE