Title CHXI01_SOME BASIC CONCEPTS OF CHEMISTRY.pdf ✅

NEET PREPARATION CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY NEET PREPARATION Date: April 16, 2025 Dura on: 0:03:00 Total Marks: 180 INSTRUCTIONS INSTRUCTIONS CHEMISTRY 1. Assertion : 3 moles of azide ion and 1 mole of nitride ion contain same amount of charge. Reason : 1 mole of azide ion and 1 mole of nitride ion have equal number of nitrogen atoms. [Q306699] (a) Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion. (b) Both Assertion and Reason are correct but Reason is not the cor‐ rect explanation of the Assertion. (c) Assertion is correct but Reason is incorrect. (d) Assertion is incor‐ rect but Reason is correct. 2. Calculate the weight of lime (CaO) obtained by heating 200 kg of 95% pure lime stone (CaCO3 ) ? [Q307021] (a) 104.4 kg (b) 105.4 kg (c) 212.8 kg (d) 106.4 kg 3. The vapour of gas A is three times that of gas B. If the molecular weight of A is M, the molecular weight of B is [Q306600] (a) 3M (b) √3M (c) M 3 (d) M √3 4. A compound has 20% of nitrogen by weight. If one molecule of the compound contains two ni‐ trogen atoms, the molecular weight of the com‐ pound is [Q306774] (a) 35 (b) 70 (c) 140 (d) 280 5. An organic compound contains carbon hydrogen and oxygen. Its elemental analysis gave C, 38.71%, and H, 9.67%. The empirical formula of the compound would be [Q306639] (a) CH3O (b) CH2O (c) CHO (d) CH4O 6. Assertion : Element and compound are the examples of pure substances. Reason : Element contains one kind of atoms while a compound contains more than one kind of ele‐ ments or atoms. [Q306820] (a) Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion. (b) Both Assertion and Reason are correct but Reason is not the cor‐ rect explanation of the Assertion. (c) Assertion is correct but Reason is incorrect. (d) Assertion is incor‐ rect but Reason is correct. 7. In redox reaction 1 g-eq of reducing agent re‐ quires P gm-eq. of oxidising agent. The value of P is [Q306873] (a) 1 (b) 2 (c) 3 (d) Depends on reaction 8. Consider aqueous solutions containing 6 g of each of (I) CH3COOH, (II) C3H7OH and (III) urea in 100 mL of solution. Which of them has the maximum molarity of all the particles (mole‐ cules and ions) ? [Q306926] (a) I (b) II (c) III (d) All equal 9. Assertion : Molecular weight of a compound is 44 if its File failed to load: /extensions/MathZoom.js 4/19/25, 4:14 PM CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY file:///C:/Users/DSREENATH/Downloads/NEET/CHEMISTRY/MEDIUM/QUESTIONS/CHXI01_SOME BASIC CONCEPTS OF CHEMISTRY.html 1/9

NEET PREPARATION according to the following reaction? CaCO3 (s)+2HCl ( aq ) → CaCL2 ( g ) + H2O (l) [Calculate upto second place of decimal point] [Q306975] (a) 1.32 g (b) 3.65 g (c) 9.50 g (d) 1.25 g 22. 3 g of a hydrocarbon on combustion in excess of oxygen produces 8.8 g of CO2 and 5.4 g of H2O. The data illustrates the law of [Q306668] (a) Conservation of mass (b) Multiple proportions (c) Constant proportions (d) Reciprocal proportions 23. Percentage of iron in K3 Fe(CN)6 is [Q306827] (a) 18.36% (b) 17.02% (c) 34.04% (d) 51.06% 24. 50 mL of 20.8%(w/V)BaCl2 (aq) and 100 mL of 9.8%(w/V)H2SO4 (aq) solutions are mixed. Molarity of Cl − ions in the resulting solution is (At. wt. of Ba = 137 ) [Q306951] (a) 0.333 M (b) 0.666 M (c) 0.1 M (d) 1.33 M 25. The hydrated salt Na2CO3 . xH2O undergoes 63% loss in mass on heating and becomes anhy‐ drous. The value of x is [Q307049] (a) 10 (b) 12 (c) 8 (d) 18 26. In which ratio of volumes 0.4 M HCl and 0.9 M HCl are to be mixed such that the concentration of the resultant solution becomes 0.7 M? [Q306944] (a) 1: 1 (b) 2: 3 (c) 4: 9 (d) 3: 2 27. The normality of 10%(w/V) of acetic acid is [Q306878] (a) 1 N (b) 1.3 N (c) 1.7 N (d) 1.9 N 28. Match Column I with Column II and choose the correct combination from the given options given. [Q307029] (a) A − R, B − P, C − S, D − Q (b) A − R, B − S, C − P, D − Q (c) A − P, B − R, C − Q, D − S (d) A − S, B − P, C − R, D − Q 29. 16 g of SOx occupies 5.6 litre at STP. Assuming ideal gas nature. The value of x is : [Q306753] (a) 1 (b) 2 (c) 3 (d) None of these 30. A gas mixture contains 25% He and 75% CH4 by volume at a given temperature and pressure. The percentage by mass of methane in the mix‐ ture is approximately [Q306830] (a) 25% (b) 92% (c) 8% (d) 75% 31. 6.90 gm of a metal carbonate were dissolved in 60 mL of 2N HCl. The excess acid was neu‐ tralised by 20 mL of 1N NaOH. What is the equivalent wt. of metal ? [Q306888] (a) 40 (b) 20 (c) 19 (d) 39 32. In the reaction: 2Al (s)+6HCl ( aq ) → 2Al 3 + ( aq )+6Cl − ( aq )+3H2 ( g ) [Q307043] (a) 6LHCl(aq) is con‐ sumed for every 3LH2 ( g ) produced (b) 22.4LH2 ( g ) at STP is produced for every mole Al that reacts (c) 67.2LH2 ( g ) at STP is produced for every mole Al that reacts (d) 11.2LH2 ( g ) at STP is produced for every mole HCl(aq) consumed 33. Zinc sulphate contains 22.65% of zinc and 43.9% of water of crystallisation. If the law of constant proportions is true, then the weight of zinc required to produce 20 g of the crystals will be [Q306673] [ ] File failed to load: /extensions/MathZoom.js 4/19/25, 4:14 PM CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY file:///C:/Users/DSREENATH/Downloads/NEET/CHEMISTRY/MEDIUM/QUESTIONS/CHXI01_SOME BASIC CONCEPTS OF CHEMISTRY.html 3/9
NEET PREPARATION (a) 45.3 g (b) 4.53 g (c) 0.453 g (d) 453 g 34. 0.4 g of dihydrogen is made to react with 7.1 g of dichlorine to form hydrogen chloride. The volume of hydrogen chloride formed at 273 K and 1 bar pressure is [Q306993] (a) 4.54 L (b) 90.8 L (c) 45.4 L (d) 9.08 L 35. What volume of hydrogen gas at 273K and 1atm pressure, will be consumed in obtaining 21.6 g of elemental boron (atomic mass = 10.8) from the reduction of borontrichloride by hydro‐ gen? [Q307002] (a) 22.4 L (b) 67.2 L (c) 89.6 L (d) 44.8 L 36. Assertion : In a given compound, the relative number and kind of atoms are constant. Reason : The properties of a compound are completely different from those of its constituent elements. [Q306824] (a) Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion. (b) Both Assertion and Reason are correct but Reason is not the cor‐ rect explanation of the Assertion. (c) Assertion is correct but Reason is incorrect. (d) Assertion is incor‐ rect but Reason is correct. 37. Suppose 60% by mass aqueous solution of glu‐ cose (Molar mass: 180 g/mol) and 20% by mass of aqueous solution of urea (Molar mass: 60) has equal molarity, then which solution has higher density: [Q306950] (a) Glucose solution (b) Both have equal density (c) Urea solution (d) Cannot be predicted 38. In an experiment, 4 g of M2Ox oxide was re‐ duced to 2.8 g of the metal. If the atomic mass of the metal is 56 g mol − 1 , the number of O - atoms in the oxide is [Q306857] (a) 1 (b) 2 (c) 3 (d) 4 39. 6.02 × 10 20 molecules of urea are present in 100 mL of its solution. The concentration of so‐ lution is [Q306932] (a) 0.01 M (b) 0.001 M (c) 0.1 M (d) 0.02 M 40. If m1 gram of a metal A displaces m2 gram of another metal B from its salt solution and if the equivalent weights are E1 andE2 respectively then the equivalent weight of A can be expressed by [Q306876] (a) E1 = m2 ×E2 m1 (b) E1 = m1 m2 × E2 (c) E1 = m1 ×m2 E2 (d) E1 = m1 ×m2 E2 41. Common salt obtained from sea - water con‐ tains 95% NaCl by mass. The approximate num‐ ber of molecules present in 10 g of the salt is: [Q306756] (a) 10 21 (b) 10 22 (c) 10 23 (d) 10 24 42. 0.48 g of a sample of a compound containing boron and oxygen contains 0.192 g of boron and 0.288 g of oxygen. What will be the percentage composition of the compound? [Q307054] (a) 60% and 40% B and O respectively (b) 40% and 60% B and O respectively (c) 30% and 70% B and O respectively (d) 70% and 30% B and O respectively 43. Which of the following should be done in order to prepare a 0.6 M NaCl starting with 100ml of 0.3 M NaCl. (M. wt of NaCl = 58.5)? [Q306910] (a) Add 5.85 g NaCl (b) Add 20 mL of water (c) Add 0.03 moles NaCl (d) Evaporate 10 mL of water 44. Assertion : 1.34 × 10 − 3 and 1.23 both have three significant figures. Reason : Numbers other than zero are all significant. [Q307090] (a) Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion. (b) Both Assertion and Reason are correct but Reason is not the cor‐ rect explanation of the Assertion. (c) Assertion is correct but Reason is incorrect. (d) Assertion is incor‐ rect but Reason is correct. 45. Excess of NaOH (aq) was added to 100 mL of FeCl3 (aq) resulting into 2.14 g of Fe(OH)3 . The √ File failed to load: /extensions/MathZoom.js 4/19/25, 4:14 PM CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY file:///C:/Users/DSREENATH/Downloads/NEET/CHEMISTRY/MEDIUM/QUESTIONS/CHXI01_SOME BASIC CONCEPTS OF CHEMISTRY.html 4/9