Description : Using IUPAC norms write the formulae for the following: (a) Tris(ethane-1,2-diamine) chromium (III) chloride (b) Potassium tetrahydroxozincate(II) -Chemistry
Last Answer : a) [Cr(en)3] Cl3 (b) K2[Zn(OH)4]
Description : Which hydrocarbon is formed by the action of sodium on ethyl iodide? (a) Methane (b) Ethane (c) Ethylene (d) Butane
Last Answer : Ans:(d)
Description : The eclipsed and staggered forms of ethane are said to differ in __________. (a) molecular formula (b) configuration (c) conformation (d) constitution
Last Answer : conformation
Description : What is the total number of ions in the empirical formula NaOH?
Last Answer : Sodium Hydroxide is an ionic compound formed by two ions.
Description : Using IUPAC norms write the formulae for the following: (a) Potassium trioxalatoaluminate (III) (b) Dichloridobis(ethane-l, 2-diamine) cobalt (III) -Chemistry
Last Answer : (a) K3[Al(C2O4)3] (b) [Co(Cl)2(en)2]+
Description : Number of ions which are identified by dil. HCl from the following. `(i) SO_(4)^(2-) " " (ii) CO_(3)^(2-) " " (iii) SO_(3)^(2-) " " (iv) HCO_(3)^(-)`
Last Answer : Number of ions which are identified by dil. HCl from the following. `(i) SO_(4)^(2-) " " (ii) CO_(3)^(2-) " ... CH_(3)CO O^(-) " " (viii) PO_(4)^(3-)`
Description : What does the stomata open? (I) When the guard cells are in flaccid condition (ll) When there is an accumulation of K ions in the guard cells (III) When water enters into the guard cells (IV) When the water potential of ... of adjacent cells (A) II, III and IV I and IV (B) I and III (C) (D) None
Last Answer : (A) II, III and IV
Description : Which of the following is true when HCL is passed through water. (i) It does not ionize in the solution as it is a covalent compound (ii) It ionizes in the solution (iii) It gives both hydrogen and hydroxyl ions in the solution ... ) (i) only (b) (iii) only (c) (ii) and (iv) only (d) (iii) and (iv)
Last Answer : (c) (ii) and (iv) only
Description : Given below are four statements (i-iv) regarding human blood circulatory system. (i) Arteries are thick-walled and have narrow lumen as compared to veins. (ii) Angina is acute chest pain when the blood circulation to the brain is ... (iv) (b) (i) and (ii) (c) (ii) and (iii) (d) (iii) and (iv)
Last Answer : (a) (i) and (iv)
Description : Which of the following is chiefly present in LPG (Liquefied Petroleum Gas) ? (1) Methane (2) Ethane (3) Propane (4) Butane
Last Answer : Butane
Description : Name the following coordination compounds according to IUPAC system of nomenclature :(i) [Co(NH3)4 (H2O)Cl]Cl2 (ii) [CrCl2(en)2]Cl, (en = ethane – 1, 2 – diamine) -Chemistry
Last Answer : (i) [CO(NH3)4 (H2O)Cl]Cl2 Tetraammine aquachlorido cobalt (III) chloride (ii) [CrCl2(en)2]Cl Dichlorobis (ethane-1, 2-diamine) chromium (III) chloride
Description : Do the positive charges of calcium ions and sodium ions make these ions more likely to move into or out of the cell?
Last Answer : Need answer
Description : What happens when two sodium ions are put together?
Last Answer : Feel Free to Answer
Description : What area around it so has a high concentration of sodium ions are the result the cell membrane expands and burst which problem was the cell most likely having?
Last Answer : What is the answer ?
Description : How many ions are in sodium acetate?
Last Answer : 1 ion
Description : During compensation of respiratory alkalosis, all the following changes occur except (A) Decreased secretion of hydrogen ions by renal tubules (B) Increased excretion of sodium in urine (C) Increased excretion of bicarbonate in urine (D) Increased excretion of ammonia in urine
Last Answer : Answer : D
Description : The following ions help in enzymatic transfer of phosphate from ATP to pyruvic acid: (A) Sodium (B) Calcium (C) Magnesium (D) Potassium
Description : A striking feature of living cells is a marked difference between the composition of the cytosol and the extracellular milieu. Which of the following statement(s) concerning the mechanisms of maintenance ... d. The selectivity of cell membranes relates only to ions and not organic compounds
Last Answer : Answer: a The survival of the cell requires that cytosolic composition be maintained within narrow limits, despite the constant influx of nutrients and the simultaneous outflow of waste. A ... be altered drastically as a result of regulatory or signaling processes that occur within the cell
Description : The two metal ions that cause hardness to water are: (1) Calcium, Magnesium (2) Sodium, Calcium (3) Sodium, Potassium (4) Sodium, Magnesium
Last Answer : (1) Calcium, Magnesium Explanation: Calcium and magnesium ion cause hardness of water.
Description : During the nerve impulse transmission, following ion or ions may play significant roles D A. Sodium B. Potassium C. Chloride D. All of these
Last Answer : All of these
Description : The following are true about rods in darkness: a. there is tonic release of neurotransmitters b. the sodium ion channels are open c. the potassium ion channels are shut d. there is a net influx of sodium ions
Last Answer : there is a net influx of sodium ions
Description : The conduction velocity of the nerve fibres is increased by: a. decreased temperature b. increased concentration of the external sodium ions e. increased axon diameter d. myelination
Last Answer : myelination
Description : Human urine is usually acidic because (a) potassium and sodium exchange generates acidity (b) hydrogen ions are actively secreted into the filtrate (c) the sodium transporter exchanges one hydrogen ion for each sodium ion, in peritubular capillaries (d) excreted plasma proteins are acidic.
Last Answer : (b) hydrogen ions are actively secreted into the filtrate
Description : Accumulation of high exchangeable sodium ions and pH more than 8.5 is called a. Pedoturbation b. Solonization c. Dealkalisation d. Gleization
Last Answer : b. Solonization
Description : Gleization occurs due to — a. Due to poor drainage b. High organic matter c. Removal of sodium ions d. Mixing of the soils
Last Answer : a. Due to poor drainage
Description : Presence of sodium tripolyphosphate (an additive) in synthetic detergent (A) Facilitates its use even in hard water (by sequestering the waterhardening Ca & Mg ions) (B) Inhibits its corrosive effects (C) Does not allow redeposition of dirt on the cleaned surface (D) None of thes
Last Answer : (A) Facilitates its use even in hard water (by sequestering the waterhardening Ca & Mg ions)
Description : The concentration of sodium ions in the standard WHO oral rehydration solution is: A. 40 m moles/L B. 60 m moles/L C. 90 m moles/L D. 110 m moles/L
Last Answer : C. 90 m moles/L
Description : Sodium ions are "pumped" from a region of lower concentration to a region of higher concentration in the nerve cells of humans. This process is an example of (A) Diffusion (B) Passive transport (C) Osmosis (D) Active transport
Last Answer : (D) Active transport
Description : Which of the following atoms or ions would be the smallest? w) sodium atom x) magnesium atom y) singly charged sodium ion z) doubly charged magnesium ion
Last Answer : ANSWER: Z -- DOUBLY CHARGED MAGNESIUM ION
Description : What ions determine the resting potential of a nerve? a) sodium and calcium b) calcium and copper c) potassium and calcium d) sodium and potassium
Last Answer : ANSWER: D -- SODIUM AND POTASSIUM
Description : The resting potential of a neuron is dependent on what two ions? a) lead and calcium ions b) calcium and phosphate ions c) sodium and potassium ions d) potassium and phosphate ions
Last Answer : ANSWER: C -- sodium and potassium ions
Last Answer : Calcium, Magnesium
Description : how should you indicate that there are multiple polyatomic ions in a chemical formula?
Last Answer : put parentheses around the atoms in the ion and then add a subscript - apex
Description : A six co-ordinate complex has the formula `CoCl_(3).5NH_(3).H_(2)O`. Electrical coductance measurements indicate the presence of three ions in one for
Last Answer : A six co-ordinate complex has the formula `CoCl_(3).5NH_(3).H_(2)O`. Electrical coductance measurements indicate the ... complex? A. 3 B. 2 C. 4 D. 1
Description : What is the formula of the compound formed between nitrate and chromium ions?
Last Answer : The chemical formula of chromium nitrate is Cr(NO3)3.
Description : What is the formula of the compound formed between the ions Cr 3plus and CO3 2minus?
Last Answer : Cr2(CO3)3
Description : What is the formula of the compound formed between the ions Co2 plus and PO43-?
Last Answer : The formula is Co3(PO4)2.
Description : Write the balanced equation for the following chemical reactions. (i) Hydrogen + Chlorine → Hydrogen chloride (ii) Barium chloride + Aluminium sulphate → Barium sulphate + Aluminium chloride (iii) Sodium + Water → Sodium hydroxide + Hydrogen -Chemistry-10
Last Answer : (i) H2 + Cl2 → 2HCl (ii) 3 BaCl2 + Al2(SO4)3 → BaSO4 + 2 AlCl3 (iii) 2Na + 2H2O → 2NaOH + H2↑
Description : A small iodine crystal is added to each of the following aq solutions: I. sodium sulphate II. Sodiumthiosulphate III. Sodium tetrathionate IV. Sulphur
Last Answer : A small iodine crystal is added to each of the following aq solutions: I. sodium sulphate II. Sodiumthiosulphate ... only in III and IV D. only in II
Description : Write two important uses of each of the following: (i)Sodium carbonate (II)Sodium Hydroxide (iii)Sodium hydrogen carbonate
Last Answer : Ans.(I)Sodium carbonate :for softening of hard water ,laboratory reagent. (II)Sodium hydroxide: in the manufacture of soap, in the purification of bauxite. (iii) Sodium hydrogen carbonate: as a mild antiseptic, as an antacid.
Description : Write the molecular formulae of: 1. Copper oxide 2. Iron (III) chloride 3. Sodium hydroxide 4. Iron (II) sulphide 5. Lead (II) oxide 6. Hydrogen nitrate (nitric ... Hydrogen sulphate (sulphuric acid) 8. Calcium hydroxide 9. Magnesium carbonate 10.Ammonium carbonate
Last Answer : 1. Copper oxide - CuO 2. Iron (III) chloride - FeCl3 3. Sodium hydroxide - NaOH 4. Iron (II) sulphide - FeS 5. Lead (II) oxide - PbO 6. Hydrogen nitrate (nitric acid) - HNO3 7. ... ) - H2SO4 8. Calcium hydroxide - Ca(OH)2 9. Magnesium carbonate - MgCO3 10.Ammonium carbonate - (NH4)2CO3
Description : Setting time of cement increases by adding (i)gypsum (ii)sodium oxide (iii)calcium chloride [ A ] i [ B ] i and ii [ C ] i and iii [ D ] i, ii and iii
Last Answer : [ A ] i
Description : Crucible is repaired by? (i) Magnasite Powder (ii) Magnasite Powder & Sodium Silicate.* (iii) Sodium Silicate (iv) Aluminium powder
Last Answer : (ii) Magnasite Powder & Sodium Silicate.*
Description : (i) Write down the IUPAC name of the following complex : [Cr(NH3)2CI3(en)]Cl (en = ethylenediamine) (ii) Write the formula for the following complex : Pentaamminenitrito-o-Cobalt (III) -Chemistry
Last Answer : (I) [Cr(NH3)2Cl3(en)]Cl IUPAC name : Diammine dichlorido ethylenediamine chromium (III) chloride. (ii) [Co(NH3)5(ONO)]2+
Description : A metal X' acquires a green colour coating on its surface on exposure to air. (i) Identify the metal X' and name the process responsible for this change. (ii)Name and write chemical ... the green coating formed on the metal. (iii) List two important methods to prevent the process. -Chemistry
Last Answer : (i) Metal is copper. The process is corrosion. (ii)Basic copper carbonate [CuCO3.Cu(0H)2]. (iii) • It should be coated with tin • It should be mixed with other metals to form alloys.
Description : Consider the following four statements (i), (ii), (iii) and (iv) and select the right option for two correct statements. Statements : (i) In vexillary aestivation, the large posterior petal is called-standard, two lateral ones are ... iii) (b) (i) and (ii) (c) (ii) and (iii) (d) (iii) and (iv).
Last Answer : (b) (i) and (ii)
Description : Which ions are present in blood and surface water ?
Last Answer : Blood and surface water contain bicarbonate ions.
Description : The volume (in `mL`) of `0.1M Ag NO_(3)` required for complete precipitation of chloride ions present in `30 mL` of `0.01M` solution of `[Cr(H_(2)O)_(
Last Answer : The volume (in `mL`) of `0.1M Ag NO_(3)` required for complete precipitation of chloride ions present ... Cl]Cl_(2)`, as silver chloride is close to:
Description : What type of ions are present in solution but are not actually involved in a chemical reaction?
Last Answer : These ions are called "spectators".