Description : The hottest part of the flame of a Bunsen burner is the
Last Answer : The hottest part of the flame of a Bunsen burner is the A. Blue Zone B. Zone of complete combustion ... D. All parts of the flame are equally hot.
Description : In which direction should you move the inoculating loop in the Bunsen burner flame?
Last Answer : Need answer
Description : Why should you turn a Bunsen burner to a yellow flame if you need to leave it?
Last Answer : The yellow flame is more visible - making it easier for othersto see. It's also a colder flame than the blue conical one.
Description : Bunsen burner is an example of a/an __________ burner. (A) Inside mixing/premix type (B) Outside mixing/diffusion flame/nozzle mix type (C) Rotary cup (D) Submerged combustion
Last Answer : (A) Inside mixing/premix type
Description : When a metal is heated in a flame, the electrons absorb energy and jump to higher energy state. On coming back to the lower energy state, they emit light, which we can observe in - (1) Raman spectra (2) Absorption spectra (3) Emission spectra (4) Fluorescence
Last Answer : (3) Emission spectra Explanation: When a metal atom is strongly heated, its electrons absorb the heat energy and jump to a higher energy level. When the electron returns to its original position it ... to the energy the electron has released at each stage °fits fall back to its original state.
Description : When a metal is heated in a flame, the electrons absorb energy and jump to higher energy state. On coming back to the lower energy siate, they emit light, which we can observe in (1) Raman spectra (2) Absorption spectra (3) Emission spectra (4) Fluorescence
Last Answer : Emission spectra
Description : Give reasons for the following observations: (a) The element carbon forms a very large number of compounds. (b) Air holes of a gas burner have to be adjusted when the heated vessels get blackened by the flame. (c) Use of synthetic detergents causes pollution of water. -Chemistry
Last Answer : Answer. (a) Carbon forms large number of compounds since carbon is small in size and can form stable covalent bonds (catenation) and it shows tetravalency. (b) Air holes of gas burner are ... not get blackened. (c) Some synthetic detergents are non-biodegradable, therefore, cause pollution of water.
Description : What kind of combustion is observed in alkanes? Why do air holes of a gas burner have to be adjusted when vessel being heated gets blackened by the flame? -Science
Last Answer : Alkanes are saturated hydrocarbons and generally burn in air with a blue, non-sooty flame. If the bottoms of the cooking vessels in our homes are getting blackened, it shows that the air holes of the gas stove are getting blocked and the fuel is not burning completely.
Description : Who Discovered Bunsen Burner ?
Last Answer : Robert Bunsen discovers Bunsen Burner.
Description : What is a Bunsen burner from the North Sea?
Last Answer : The bunsen burner doesn't come from the North Sea. In the UnitedKingdom, the mains gas supply is natural gas which largely comesfrom the wells in the North Sea, so we call it North Sea gas. ... 1970's we used coal gaswhich needed a different admixture of air so all our bunsens had tobe converted.
Description : Why is it safer to close the air holes of the Bunsen burner with unattended?
Last Answer : What is the answer ?
Description : What is a stand and mat used to hold a beaker or flask over a Bunsen burner?
Description : A colorless salt gives violet colour to Bunsen flame and also turns moisture litmus paper blue. It is :
Last Answer : A colorless salt gives violet colour to Bunsen flame and also turns moisture litmus paper blue. It is : A. `Na_(2) ... C. `NaNO_(3)` D. `K_(2)CO_(3)`
Description : How many of following metals impart a characteristic colour to the Bunsen flame ? `(i) Na " " (ii) Li " " (iii) K " " (iv) Ba` `(v) Sr " " (vi) Mg " "
Last Answer : How many of following metals impart a characteristic colour to the Bunsen flame ? `(i) Na " " (ii) Li " " (iii) K ... ix) `Be " " (x )Ca " " (x i)Cu`
Description : In the following diagram bunsen flame the (X ) represent.
Last Answer : In the following diagram bunsen flame the (X ) represent. A. Oxidising zone B. Reducing zone C. Lower temperature zone D. Hottest portion of flame
Description : Colour imparted to the Bunsen flame by strontium salt is - (1) bluish green (2) apple-green (3) brick red (4) crimson red
Last Answer : (4) crimson red Explanation: A flame test is performed by introducing a sample into the blue flame of a bunsen burner and noting any change in the colour of the flame. The tests can be used ... metallic elements in salts. With strontium salt, the colour of Bunsen flame ranges from crimson to red.
Description : Colour imparted to the Bunsen flame by strontium salt is (1) bluish green (2) apple-green (3) brick red (4) crimson red
Last Answer : crimson red
Description : What does Perma-Flame Instant Re-Ignition mean on the Dacor SGM304S 30" Preference All-Gas 4 Burner Cooktop ?
Last Answer : If the piolet light blows out it will reignite instantly so you do not need matches.
Description : Which of the following statements represents an application of a silicon controlled rectifier? A. To provide DC power for a main propulsion motor. B. For use as a voltage reference diode. C. For sensing flame in an automated burner. D. To eliminate power supply hum.
Last Answer : Answer: A
Description : Presence of moisture in fuel oil would (A) Keep the burner tips cool (B) Aid in proper combustion (C) Because sputtering, possibly extinguishing flame (D) Clean the nozzles
Last Answer : (D) Clean the nozzles
Description : A hollow sphere and a solid sphere of the same material and equal radii are heated to the same temperature. In this case, (A) The cooling rate will be the same for the two spheres and hence the ... equal amount of radiation from the surrounding in the beginning (D) Both (B) & (C)
Last Answer : (D) Both (B) & (C)
Description : Which metal gives violet colour in oxidising flame when heated with borax ?
Last Answer : Which metal gives violet colour in oxidising flame when heated with borax ? A. Fe B. Pb C. Co D. Mn
Description : What happens when a piece of bangle is heated in a candle flame?
Last Answer : When a piece of bangle is heated in a candle flame, it first becomes soft and then melts as glass does not have a definite melting point.
Description : Four identical samples of a metal are heated to different temperatures. Based on the colors of their incandescences, which sample is the hottest? The sample that is: w) blue-white x) bright red y) yellow z) orange
Last Answer : ANSWER: W -- BLUE-WHITE
Description : What is an element that was discovered by Bunsen?
Last Answer : R. Bunsen and G. Kirchhoff discovered rubidium and cesium.
Description : When any solution passess through a cation exchange resin that is in acidic form, H ion of the resin is replaced by cations of the solution. A solutio
Last Answer : When any solution passess through a cation exchange resin that is in acidic form, H ion ... D. tetraaquadichloro chromium (III) chloride dihydrate.
Description : What is the correct order of decreasing stability of the following cations ? `overset(oplus)underset(CH_(3)-CH-CH_(3)` II `overset(oplus)underset(CH_(
Last Answer : What is the correct order of decreasing stability of the following cations ? `overset(oplus)underset(CH_(3)-CH-CH_( ... gt I gt III D. II gt III gt I
Description : Divalent cations are generally eliminated in marine fishes through
Last Answer : Divalent cations are generally eliminated in marine fishes through A. Gill membrane B. Anal membrane C. Fecal matter D. Oral membrane
Description : In \( III ^{ rd } \) group of salt analysis for cations \( NH _{4} Cl \) and \( NH _{4} OH \) are added as group reagents. Which of the following can be used instead of \( NH _{4} Cl \) ?(a) \( NaCl \)(b) \( \left( NH _ ... \)(c) \( \left( NH _{4}\right)_{2} C _{2} O _{4} \)(d) \( NH _{4} NO _{3} \)
Last Answer : In \( III ^{ rd } \) group of salt analysis for cations \( NH _{4} Cl \) and \( NH _{4} OH \) are added as ... O _{4} \) (d) \( NH _{4} NO _{3} \)
Description : What Members of which group of elements lose 2 electrons to form cations with a plus 2 charge?
Description : Why can transition metals form cations with a variety of charges?
Last Answer : Transition metals often form ions without complete octets that'swhy all the stable ions are all cations. You can also tell thatthey form cations because some of the transition metals formcolored compounds and give off light. Light is only given off bycations, not anions.
Description : A compound composed of cations and anions is called a?
Last Answer : covalent compound
Description : Anion gap in plasma is because (A) Of differential distribution of ions across cell membranes (B) Cations outnumber anions in plasma (C) Anions outnumber cations in plasma (D) Of unmeasured anions in plasma
Last Answer : Answer : B
Description : Anion gap is the difference in the plasma concentrations of (A) (Chloride) – (Bicarbonate) (B) (Sodium) – (Chloride) (C) (Sodium + Potassium) – (Chloride + Bicarbonate) (D) (Sum of cations) – (Sum of anions)
Last Answer : Answer : C
Description : One of the principal cations of soft tissue and body fluids is (A) Mg (B) S (C) Mn (D) Co
Last Answer : Answer : A
Description : Which of the following statements about extracellular fluid are true? A. The total extracellular fluid volume represents 40% of the body weight. B. The plasma volume constitutes one fourth ... the interstitial fluid. E. The interstitial fluid equilibrates slowly with the other body compartments.
Last Answer : Answer: B DISCUSSION: The total extracellular fluid volume represents 20% of body weight. The plasma volume is approximately 5% of body weight. Sodium is the principal cation. The ... fluid and cerebrospinal fluid, the majority of the interstitial fluid exists as a rapidly equilibrating component
Description : During electrolysis, the cations and anions of the electrolyte are 1. Discharged 2. Hydrolysed 3. In motion 4. Hydrated The correct answers are: (a) 1 and 3 (b) 2 and 4 (c) 3 and 4 (d) 1 and 2
Last Answer : Ans:(a)
Description : Atoms having the same number of protons but different number of neutrons are called : (1) Isotopes (2) Cations (3) Higgs-boson (4) Anions .
Last Answer : (1) Isotopes Explanation: Atoms that have the same number of protons but different numbers of neutrons are called isotopes. For example, carbon-12, carbon13 and carbon-14 are three isotopes of the element ... has 6 protons, so that the neutron numbers of these isotopes are 6, 7 and 8 respectively.
Description : Ionic compounds containing cations (+ve ion) and anions (-ve ion) are?
Last Answer : Salt
Description : Pick out the correct statement. (A) Loss of electrons from neutral atoms produces negative ions (B) The radius of nucleus & atomic size are of the order of 10 -12 cm & 10 - 8 cm respectively (C) Gain of electrons by neutral atoms form cations
Last Answer : (B) The radius of nucleus & atomic size are of the order of 10 -12 cm & 10 - 8 cm respectivel
Description : What are cations?
Last Answer : Cations are atoms that have lost an electron to become positively charged.
Description : Explain why cations are smaller and anions are larger in size than their parent atom.
Last Answer : Ans.The ionic radius of cation is always smaller than the parent atom because the loss of one or more electrons increases the effective nuclear charge. As a result, the force of attraction of ... the force of attraction of the nucleus for the electrons decreases and hence the ionic radii increases.
Description : The five kingdoms of Whittaker’s classifi- cations are?
Last Answer : Kingdom Monera; Kingdom Protista; Kingdom Fungi; Kingdom Plantae; Kingdom Animalia
Description : Negatively charged ions are called a. anions b. cations c. both d. none of them
Last Answer : anions
Description : Positively charged ions are called a. anions b. cations c. both d. none of them
Last Answer : cations
Description : Active and passive transports across cell membrane differ in (a) passive transport is nonselective (b) passive transport is along the concentration gradient while active transport is due to metabolic ... (d) passive transport is confined to anions while active transport is confined to cations.
Last Answer : (b) passive transport is along the concentration gradient while active transport is due to metabolic energy
Description : Zeolite is a/an (A) Naturally occuring clay which is capable of exchanging cations (B) Abrasive material (C) Catalyst used in shift conversion (D) None of these
Last Answer : (A) Naturally occuring clay which is capable of exchanging cations
Description : Very strongly acidic cations have pKa values -------. a.between11.5 – 14.0 b. between6.0-11.5 c. between1.0-6.0 d. below -4.0
Last Answer : d. below -4.0