Description : Magnesium per chlorate is called Anhydrone {mg (ClO4)2}
Last Answer : Bleaching powder is obtained when cl2 is passes through. Dry Slake lime CaOCl2+H2OàCa (OH) 2+Cl2
Description : Bleaching powder (chemically known as calcium chloro hypochlorite) is commercially produced by the action of chlorine on (A) Slaked lime (B) Soda lime (C) Calcium perchlorate (D) None of these
Last Answer : (A) Slaked lime
Description : Aren't keywords supposed to be separated by a comma?
Last Answer : No
Description : An integer constant in C must have A) At least one digit B) At least one decimal point C) A comma along with digits D) Digits separated by commas
Last Answer : A) At least one digit
Description : Arrange the following order of the property indicated: (a). F, Cl, Br and I (negative electron gain enthalpy) (b). Mg, Al, Si and Na (ionization enthalpy) (c). C, N, O and F (second ionization enthalpy)
Last Answer : Ans. (a). I
Description : Calculate the number of atoms present in 7.1 g of chlorine ?
Last Answer : Calculate the number of atoms present in 7.1 g of chlorine ? A. `0.2 N_(A)` B. `0.3N_(A)` C. `0.4N_(A)` D. `0.5 N_(A)`
Description : Find the structure of the following atoms: (i) `._(8)^(16)O" "` (ii) `._(17)^(35)Cl" "` (iii) `._(13)^(27)Al`.
Last Answer : Find the structure of the following atoms: (i) `._(8)^(16)O" "` (ii) `._(17)^(35)Cl" "` (iii) `._(13)^(27)Al`.
Description : Which one of the following pairs of atoms would form a non-polar covalent bond? A C and O B N and O C Cl and Cl D Na and Cl E Ne and Ne
Last Answer : C Cl and Cl
Description : Non-metallic character increases from (1) Magnesium to Barium (2) Potassium to Cesium (3) Oxygen to Selenium (4) Sodium to Chlorine
Last Answer : (4) Sodium to Chlorine Explanation: The elements which lose electrons to form cations are known as metals. Metallic character decreases across a period as we move from left to right.
Description : Write balanced chemical equations for the following word equations: (a) Iron + Chlorine → Iron (III) chloride (b) Magnesium + dil sulphuric acid → Magnesium sulphate + water (c) Magnesium + oxygen → ... oxide (d) Calcium oxide + water → Calcium hydroxide (e) Sodium + chlorine → Sodium chloride
Last Answer : (a) Iron + Chlorine → Iron (III) chloride 4Fe + 3Cl2 → 2F2Cl3 (b) Magnesium + dil sulphuric acid → Magnesium sulphate + water 2Mg + 2H2SO4 → 2MgSO4 + 2H2 (c) Magnesium + oxygen → Magnesium oxide 2Mg ... hydroxide CaO + H2O → Ca(OH)2 (e) Sodium + chlorine → Sodium chloride 2Na + Cl2 → 2NaCl
Description : The oxygen evolved during photosynthesis, comes from water molecules. Which one of the following pairs of elements is involved in this reaction? (a) Magnesium and Molybdenum (b) Magnesium and Chlorine (c) Manganese and Chlorine (d) Manganese and Potassium
Last Answer : (c) Manganese and Chlorine
Description : What is the dissociation of Cu(ClO4)2?
Last Answer : Cu(ClO4)2 ==> Cu^2+ and 2ClO4^-
Description : Is beryllium perchlorate ionic or covalent?
Last Answer : Need answer
Description : What is the net ionic equation for ammonium perchlorate and potassium hydroxide?
Last Answer : The chemical reaction is:NH4ClO4 + KOH ↔ KClO4 + NH4OH
Description : In which o the following situations is it not appropriate to use a comma?
Last Answer : To replace the word and in compound sentences
Description : Calculate the number of oxygen atoms in 1 mole of O2. -Chemistry 9th
Last Answer : 1 molecule of O2 = 2 oxygen atoms So, 1 mole of O2 = 2 mole oxygen atoms = 2 × 6.022 × 1023 = 12.044 ×1023 oxygen atoms.
Description : What is the most likely oxidation state of Cl (chlorine)?
Last Answer : In one's initial studies of chemistry it is -1. However, don't forget that in chlorine itself the O.S. is zero.
Description : Chlorine gas is produced by the electrolysis of brine (NaCl solution with solid NaCl make up) in mercury electrolytic cell. Which of the following is the anodic reaction? (A) Oxidation of Na + ions (B) Oxidation of Cl - ions (C) Reduction of Na + ions (D) Reduction of Cl - ions
Last Answer : (B) Oxidation of Cl - ions
Description : Is the following equation balanced Mg plus cl - and gt2Mgcl?
Last Answer : NO
Description : Na+/K+-ATPase along with ATP requires (A) Ca (B) Mn (C) Mg (D) Cl
Last Answer : Answer : C
Description : While waiting for a video game to download, you notice that 30 % 30%30, percent of 32 , 000 32,00032, comma, 000 kilobytes have been downloaded so far.?
Last Answer : 44811
Description : How can you justify that a reaction between magnesium and oxygen is a redox reaction w hile the reaction shows only addition of oxygen 2mg plus O 2mgo?
Last Answer : Oxidation is a redox reaction.
Description : How many moles of iodine are produced from 560 g of magnesium iodide?
Last Answer : not sure
Description : If the depletion of oxygen is found to be 2.5 mg/litre after incubating 2.5 ml of sewage diluted to 250 ml for 5 days at 20°C, B.O.D. of the sewage is A. 50 mg/l B. 100 mg/l C. 150 mg/l D. 250 mg/l
Last Answer : ANS: D
Description : In the reaction M g C I 2 plus 2 KO H - and gt MG OH 2 plus 2 K CI if 1 mole Mg CI 2 is added to 3 moles KO H what is the limiting reagent?
Last Answer : Feel Free to Answer
Description : The sum of the mass numbers of the atoms in a molecule equals the ______, which is measured in units called _______. a. Atomic Number; Milligrams b. Mass Weight; Micrograms c. Chemical Weight; Moles d. Molecular Weight; Daltons
Last Answer : d. Molecular Weight; Daltons
Description : Nitrogen gas is filled in a container of volume 2.32 L at 32°C and 4.7 atm pressure. Calculate the number of moles of the gas.
Last Answer : Nitrogen gas is filled in a container of volume 2.32 L at 32°C and 4.7 atm pressure. Calculate the number of moles of the gas.
Description : Which of the following elements has the atomic number greater than that of Phosphorus? (1) Aluminium (2) Silicon (3) Chlorine (4) Magnesium
Last Answer : (3) Chlorine Explanation: Chlorine is a chemical element with symbol Cl and atomic number 17. Phosphorus is a chemical element with symbol P and atomic number 15.
Description : The minimum number of numerically equal vectors whose vector sum can be zero is
Last Answer : The minimum number of numerically equal vectors whose vector sum can be zero is (A) 4 (B) 3 (C) 2 (D) 1
Description : How many moles are in a sample containing 2.71 x 10^24 atoms of iron?
Last Answer : two or three
Description : How do you turn atoms into moles?
Last Answer : One mole has 6,022 140 857 atoms (Avogadro number).
Description : How many atoms of potassium make up 3 moles?
Last Answer : The number of atoms is 18,066422571.10e23.
Description : How many atoms of LiBr would you have if you start with 1.25 moles What is the answer and how did you get it?
Last Answer : Not atoms of LiBr; formula units is correct.1 mol = 6,022 140 857.10e23 (molecules, atoms, ions); this is the Avogadro number.6,022 140 857.10e23 x 1,25 = 7,52767607125.10e23 formula units of LiBr
Description : How many moles of C3H8 contain 4.95 1024 hydrogen atoms?
Last Answer : What is the answer ?
Description : How many moles on atoms are contained in 4.5X10 to the power of 22 atoms Cu?
Description : How many atoms are found in 4.75 moles of Fe?
Last Answer : 4,75 moles of iron contain 28,60516907075.1oe23 atoms.
Description : How many atoms are in three moles of lithium?
Last Answer : 3 moles Li x 6.02x10^23 atoms/mole = 1.8x10^24 atoms
Description : If you have 1.20 and times 1024 atoms of copper how many moles of copper do you have?
Last Answer : 1.20x10^24 atoms x 1 mole/6.02x10^23 atoms = 1.99 moles
Description : How many moles of atoms are in .515 g of carbon?
Last Answer : 0,515 g of carbon is equal to 0,043 moles.
Description : How many atoms are in 5.00x10^-2 moles of krypton?
Last Answer : atoms are in 5.00x10^-2 moles of krypton is 1013.9558
Description : What is the formula of the compound formed between Magnesium and Chlorine?
Last Answer : The ionic compound formed between magnesium and chlorine has theformula MgCl2.
Description : What is the balanced equation of magnesium plus chlorine equals Magnesium chloride?
Last Answer : The reaction is:Mg + Cl2 = MgCl2
Description : Bleaching of paper pulp is done with (A) Activated clay (B) Bromine (C) Chlorine or chlorine dioxide (D) Magnesium sulphite
Last Answer : (C) Chlorine or chlorine dioxide
Description : Among the following, the number of elements showing only one non-zero oxidation state is: O,Cl,F,N,P,Sn,Tl,Na,Ti
Last Answer : Among the following, the number of elements showing only one non-zero oxidation state is: O,Cl,F,N,P,Sn,Tl,Na,Ti
Description : From the elements: Cl, Br, F, O, Al, C, Li, Cs and Xe; choose the following: (a) The element with highest negative electron gain enthalpy. (b) The element with lowest ionization enthalpy. ( ... . (f)The element which belongs to zero group. (g) The elements which forms largest number of compounds.
Last Answer : Ans. (a). The element chlorine (Cl) has the highest negative electron gain enthalpy. (b). The element cesium (Cs) has lowest ionization enthalpy. (c). The element fluorine F has lowest atomic radius. (d ... zero group (or group 18). (g). The element carbon (C) forms the largest number of compounds.
Description : What is the oxidation number of Cl in HClO (read: H - C - L - O)?
Last Answer : ANSWER: 1+ (accept 1)
Description : The normal concentration of chlorine in mg/100 ml of C.S.F is about (A) 200 (B) 250 (C) 300 (D) 440
Last Answer : Answer : D
Description : Dose of chlorine for disinfection of water is about __________ mg/litre of water. (A) 0.01 (B) 0.1 (C) 0.3 (D) 1
Last Answer : (D) 1
Description : Maximum permissible residual chlorine in treated water should be __________ mg/litre. (A) 0.001 to 0.01 (B) 0.2 to 0.3 (C) 2 to 3 (D) 5 to 10
Last Answer : (B) 0.2 to 0.3