Compounds","question":"Which of the following is the correct order of increasing field strength of ligands to form coordination compounds?","options":["SCN⁻ < F⁻ < C₂O₄²⁻ < CN⁻","SCN⁻ < F⁻ < CN⁻ < C₂O₄²⁻","F⁻ < SCN⁻ < C₂O₄²⁻ < CN⁻","CN⁻ < C₂O₄²⁻ < SCN⁻ < F⁻"],"answer":1,"why":"In the spectrochemical series the field strength increases SCN⁻ < F⁻ < C₂O₄²⁻ < CN⁻.","simPath":"Class-12/Chemistry/Chapter-5/problem-5.17-spectrochemical-series","simTitle":"Spectrochemical Series"},{"qNum":72,"topic":"Biomolecules","question":"Which of the following is a basic amino acid?","options":["Serine","Alanine","Tyrosine","Lysine"],"answer":4,"why":"Lysine has an extra amino group in its side chain, making it a basic amino acid.","simPath":"Class-12/Chemistry/Chapter-10/problem-10.20-vitamin-a-c-functions-sources","simTitle":"Amino Acids"},{"qNum":73,"topic":"Solutions","question":"HCl was passed through a solution of CaCl₂, MgCl₂ and NaCl. Which of the following compound(s) crystallise(s)?","options":["Both MgCl₂ and CaCl₂","Only NaCl","Only MgCl₂","NaCl, MgCl₂ and CaCl₂"],"answer":2,"why":"The common Cl⁻ ion from HCl lowers the solubility of the least soluble salt, NaCl, so only NaCl crystallises out.","simPath":"Class-12/Chemistry/Chapter-1/prompt-05-raoults-law-vapour-pressure","simTitle":"Common Ion Effect"},{"qNum":74,"topic":"Polymers","question":"Which of the following is a natural polymer?","options":["cis-1,4-polyisoprene","poly(Butadiene-styrene)","polybutadiene","poly(Butadiene-acrylonitrile)"],"answer":1,"why":"Natural rubber is cis-1,4-polyisoprene; the others are synthetic polymers.","simPath":"Class-12/Chemistry/Chapter-10/problem-10.08-starch-vs-cellulose-structure","simTitle":"Natural Polymers"},{"qNum":75,"topic":"p-Block Elements","question":"Which of the following is not correct about carbon monoxide?","options":["It forms carboxyhaemoglobin.","It reduces oxygen carrying ability of blood.","The carboxyhaemoglobin (haemoglobin bound to CO) is less stable than oxyhaemoglobin.","It is produced due to incomplete combustion."],"answer":3,"why":"Carboxyhaemoglobin is far MORE stable than oxyhaemoglobin (about 200× affinity), so statement (3) is incorrect.","simPath":"Class-11/Chemistry/Chapter-3/prompt-41-non-metallic-character-order","simTitle":"Carbon Monoxide"},{"qNum":76,"topic":"Biomolecules","question":"Sucrose on hydrolysis gives:","options":["β-D-Glucose + α-D-Fructose","α-D-Glucose + β-D-Glucose","α-D-Glucose + β-D-Fructose","α-D-Fructose + β-D-Fructose"],"answer":3,"why":"Sucrose hydrolyses to α-D-glucose and β-D-fructose (invert sugar).","simPath":"Class-12/Chemistry/Chapter-10/problem-10.08-starch-vs-cellulose-structure","simTitle":"Carbohydrates"},{"qNum":77,"topic":"Biomolecules","question":"The following metal ion activates many enzymes, participates in the oxidation of glucose to produce ATP and with Na, is responsible for the transmission of nerve signals.","options":["Iron","Copper","Calcium","Potassium"],"answer":4,"why":"Potassium (K⁺) activates enzymes, aids glucose oxidation for ATP and, with Na⁺, transmits nerve impulses.","simPath":"Class-12/Chemistry/Chapter-10/problem-10.20-vitamin-a-c-functions-sources","simTitle":"Biologically Important Ions"},{"qNum":78,"topic":"Some Basic Concepts","question":"Which one of the followings has maximum number of atoms?","options":["1 g of Ag(s) [Atomic mass of Ag = 108]","1 g of Mg(s) [Atomic mass of Mg = 24]","1 g of O₂(g) [Atomic mass of O = 16]","1 g of Li(s) [Atomic mass of Li = 7]"],"answer":4,"why":"Atoms ∝ (mass/atomic mass); 1 g Li gives 1/7 mol atoms, the largest of the four.","simPath":"Class-11/Chemistry/Chapter-1/prompt-36-mole-concept-atoms","simTitle":"Mole Concept"},{"qNum":79,"topic":"Atomic Structure","question":"The number of protons, neutrons and electrons in ¹⁷⁵₇₁Lu, respectively, are:","options":["71, 104 and 71","104, 71 and 71","71, 71 and 104","175, 104 and 71"],"answer":1,"why":"Protons = electrons = atomic number 71; neutrons = 175

🧪 NEET 2020 · Chemistry