Description : How does dissolving a salt molecule in water make its atoms ionize? -Space
Last Answer : When salt is mixed with water, the salt dissolves because the covalent bonds of water are stronger than the ionic bonds in the salt molecules. Water molecules pull the sodium and chloride ions apart, breaking the ionic bond that held them together.
Description : After dissolving 0.25 kg of salt in 1 kg of water, its volume becomes 1200 cc. What is the concentration of solution ?
Last Answer : We know , 1 cc = 1cm ^ 3 = (10 ^ -6) m ^ 3 Density of salt water = (1 + 0.25) / (1200 × 10 ^ - ৬) = 1.04 kg / (m 3)
Description : When Salt dissolving water physical change or chemical change?
Last Answer : It is a physical change because the chemical composition of saltand water do not change. You can separate the salt and waterphysically by allowing the water to evaporate, which leaves thesalt.
Description : The solution made by dissolving Salt (NaOH) in water is called as
Last Answer : Ans. Brine solution
Description : What is the molarity of a salt solution prepared b dissolving three moles of salt in 500 milliliters of water? w) 1 x) 2 y) 4 z) 6
Last Answer : ANSWER: Z -- 6
Description : What is the molality of a salt solution prepared by dissolving two moles of salt in 500 grams of water?
Last Answer : ANSWER: 4
Description : Is salt the slowest dissolving powder?
Last Answer : Need answer
Description : What is the change in dissolving sugar in water ?
Last Answer : The physical change of dissolving sugar in water.
Description : The formation of pockets of gas in a liquid is called: w) absorption x) cavitation y) adsorption z) dissolving
Last Answer : ANSWER: X -- CAVITATION
Description : What is the molality of a solution made by dissolving 6 moles of Noah in 3 kg of water?
Last Answer : Feel Free to Answer
Description : Is dissolving sugar & water reversible or irreversible?
Last Answer : ,irrrversible
Description : Detergents dissolved in water help in cleaning clothes by A. Increasing the temperature of water B. Reacting chemically with dirt C. Reducing the surface tension of water D. Dissolving dirt
Last Answer : ANSWER: C
Description : The process of dissolving an acid or a base in water is a highly - (1) Exothermic reaction (2) Endothermic reaction (3) Sublimation reaction (4) Redux reaction
Last Answer : (1) Exothermic reaction Explanation: The process of dissolving an acid or a base in water is a highly exothermic one. This is why care must be taken while mixing concentrated nitric acid or sulphuric acid with water.
Description : Uranium is recovered from its ore (pitchblende) by (A) Froth floatation technique (B) Leaching with sulphuric acid (C) Smelting in a furnace (D) Dissolving in water
Last Answer : (B) Leaching with sulphuric acid
Description : Which of the following operations does not involve leaching? (A) Dissolving gold from ores (B) Dissolving pharmaceutical products from bark or roots (C) Dissolving sugar from the cells of the beet (D) Removing nicotine from its water solution by kerosene
Last Answer : (D) Removing nicotine from its water solution by kerosene
Description : Detergents dissolved in water help in cleaning clothes by-----? A. Increasing the temperature of water B. Reacting chemically with dirt C. Reducing the surface tension of water (Answer) D. Dissolving dirt
Last Answer : C. Reducing the surface tension of water (Answer)
Description : Pick up the correct statement from the following: (A) Lime is available in Free State (B) Lime is available by dissolving calcium carbonate in water (C) Lime is available by calcining calcium carbonate at 900°C (D) Lime is nothing but calcium chloride
Last Answer : Answer: Option C
Description : An aqueous solution of sodium chloride is prepared by dissolving 10kg of sodium chloride in 50 kg of water find (i) Weight % (ii) Mole % of solution. [Atomic weight of Na = 23, Cl = 35.5]
Last Answer : Weight of NaCl = 10 kg Weight of H2O = 50 kg Total weight = 60 kg Weight % of NaCl = (10/ 60) * 100 =16.67% Weight % of H2O = (50/ 60) * 100 = 83.33% Molecular weight of NaCl = 58.5 k moles of NaCl ... 100 = 5.79% Mol % of H2O = (moles of H2O / Total moles)*100 = (2.78/ 2.949)*100 = 94.26%
Description : Sperms produce an enzymatic substance or lysin for dissolving egg coverings. It is called
Last Answer : Sperms produce an enzymatic substance or lysin for dissolving egg coverings. It is called A. ... B. hyaluronidase C. Androgamone D. Diastase.
Description : Assertion : Hydrometallurgy involves dissolving the ore in a suitable reagent followed by precipitation by a more electropositive metal. Reason : Copp
Last Answer : Assertion : Hydrometallurgy involves dissolving the ore in a suitable reagent followed by precipitation ... : Copper is extracted by hydrometallurgy.
Description : Pyrosulphuric acid may be synthesised by dissolving `SO_(3)` in
Last Answer : Pyrosulphuric acid may be synthesised by dissolving `SO_(3)` in A. `H_(2)O` B. `H_(2)SO_(3)` C. `H_(2)SO_(4)` D. `H_(2)S_(2)O_(8)`
Description : What are three way of speeding up dissolving?
Last Answer : firstly Temperature, size of pieces, and stirring
Description : Is Acid rain dissolving paint off a wall a chemical change or physical change?
Last Answer : Chemical change
Description : How can you speed uo the dissolving process when preparing juice from frozen concentrate?
Description : What is the molar mass of haemocyanin and the freezing point of the solution when an aqueous solution is prepared by dissolving 1.5 grams of haemocyanin a protein obtained from crabs in 0.25 litres of?
Last Answer : Haemocyanins are a group of proteins.
Description : What is the molarity of a solution made by dissolving 6 moles of naoh in 3 kg?
Description : What are the citizens of Louisiana dissolving themselves of?
Last Answer : h
Description : Which of the following is not related to the powers of the Governor? (1) Diplomatic and military powers (2) Power to appoint Advocate General (3) Summoning, proroguing and dissolving State Legislature (4) Power to grant pardons, reprieves, respites or remission of punishments
Last Answer : (1) Diplomatic and military powers Explanation: Diplomatic and military powers is related to the powers of the President. It is not the power of Governor.
Description : Pick out the wrong statement regarding the solubility characteristics of high polymers. (A) Greater the degree of cross-linking in the polymer, lesser is its solubility (B) Polymers having more ... of the solvent (D) High molecular weight polymers on dissolving gives solution of very low viscosity
Last Answer : (D) High molecular weight polymers on dissolving gives solution of very low viscosity
Description : Furfural solvent extraction is used for upgrading (by dissolving aromatics) (A) Naphtha (B) Lubricating oils (C) Wax (D) Cracking feedstock
Last Answer : (B) Lubricating oils
Description : Filter aids like asbestos, kieselguhr, diatomaceous earth etc. are used to increase the porosity of the final filter cake & reducing the cake resistance during filtration. Filter aid is (A) Added to the feed slurry (B) Pre ... the cake by dissolving solids or by burning it off (D) All 'a', 'b' & 'c'
Last Answer : (D) All 'a', 'b' & 'c'
Description : The mass transfer co-efficient for a solid sphere of radius 'a' dissolving in a large volume of quiescent liquid, in which ‘D’ is the diffusivity of solute, is (A) D/a (B) D/2a (C) Proportional to √D (D) Dependent on the Reynolds number
Last Answer : (D) Dependent on the Reynolds number
Description : While dissolving a gas into a liquid at a constant temperature, the ratio of the concentration of the gas in the solution phase and in the gaseous phase is (A) Infinity (B) Unity (C) Constant (D) Negative
Last Answer : (C) Constant
Description : 9.Acrosome is important for ----------- . a)ATP production, b)Dissolving membrane of ovum, c)Motility of sperm, d)Nutrition of sperm
Last Answer : b)Dissolving membrane of ovum,
Description : A negative heat of solution indicates that: w) an endothermic dissolving process occurs x) solute solubility increases with rising solution temperature y) solute solubility decreases with rising solution temperature z) super-saturation conditions exist
Last Answer : ANSWER: Y -- SOLUTE SOLUBILITY DECREASES WITH RISING SOLUTION TEMPERATURE
Description : In an acid base reaction which product is produced along with a salt? (1) Hydrogen gas (2) Oxygen gas (3) Carbon dioxide (4) Water
Last Answer : (4) Water Explanation: When an acid and a base are placed together, they read to neutralize the acid and base properties, producing a salt. The H(+) cation of the acid combines with the OH(-) anion of the base to form water.
Description : Common salt is produced from sea water in India generally by the __________ method. (A) Freeze drying (B) Solar evaporation (C) Electrolytic (D) None of these
Last Answer : B) Solar evaporation
Description : Does sea salt taste the same no matter where it was produced?
Last Answer : I wouldn’t think so. Different oceans have different minerals.
Description : The acidic solution of a salt produced a deep blue colour with starch iodine solution. The salt may be
Last Answer : The acidic solution of a salt produced a deep blue colour with starch iodine solution. The salt may be A. chloride B. carbonate C. acetate D. bromide
Last Answer : The acidic solution of a salt produced a deep blue colour with starch iodine solution. The salt may be A. Suphite B. Bromide C. Nitrite D. Chloride
Description : If addition of conc. `H_(2)SO_(4)` is made to an unknown salt, a colourless and odouriess gas is produced then which of the following can be present ?
Last Answer : If addition of conc. `H_(2)SO_(4)` is made to an unknown salt, a colourless and odouriess gas is produced then which ... C. `Cl^(-)` D. `NO_(3)^(-)`
Description : One-tenth of the total salt produced in India comes from (a) Tamil Nadu Coast (b) Sambhar Lake (c) Chilka Lake (d) Wular Lake
Last Answer : Ans: (b)
Description : Common salt is generally not produced commonly by __________ method from brine. (A) Freeze drying (B) Electrolytic (C) Solar evaporation (D) Vacuum evaporation
Last Answer : (A) Freeze drying
Description : Which of the following is the main constituent of the mother liquor produced in salt industry? (A) Quick lime (B) Glauber's salt (C) Salt petre (D) Bromine
Last Answer : (D) Bromine
Description : Vegetables are cooked in lesser time by adding a pinch of salt while cooking because (1) boiling point of water increases (2) latent heat of vaporization of water decreases (3) latent heat of vaporization of water increases (4) boiling point of water decreases
Last Answer : (1) boiling point of water increases Explanation: Adding salt raises the boiling point of water, which allows food to cook at higher temperature. The higher the temperature, the higher the rate of heat transfer between the food and water, thus it cooks more quickly.
Description : An egg sinks in soft water but floats in a concentrated solution of salt because – (1) Egg absorbs salt from the solution and expands (2) Albumin dissolves in salt solution and egg becomes lighter (3) The density of salt solution exceeds the density of eggs (4) Water has high surface tension
Last Answer : (3) The density of salt solution exceeds the density of eggs Explanation: Following the density principle, the density of the egg compared to the density of the tap water is lesser (the density principle ... and that is why an egg sinks in soft water but floats in a concentrated solution of salt.
Description : A fresh egg when placed in salt water will – (1) sink and go to the bottom (2) sink but will not go to the bottom (3) float (4) burst
Last Answer : (3) float Explanation: When a fresh egg is placed in regular water, it sinks. However, when the same egg is placed in saltwater, it floats. This is because salt water is denser than the egg causing it to float.
Description : Which one among the following substances evolved heat when dissolved in water? (1) Glucose (2) Fructose (3) Quick lime (4) Salt peter
Last Answer : (3) Quick lime Explanation: Quicklime is a widely used chemical compound. It is a white, caustic, alkaline, crystalline solid at room temperature. When limestone is heated, at about 1000° C it undergoes thermal decomposition.
Description : Which of the following is a conductor of electricity? (1) Rubber (2) Pure water (3) Salt water (4) Benzene
Last Answer : (3) Salt water Explanation: Pure water is actually an extremely poor conductor, but saturated salt water is a good conductor. The saltier the water, the better the conductance. The reason it ... charged Chlorine CF. When current is applied, it is easily conducted by the highly charged ions.