NEET AIPMT Chemistry Chapter Wise Solutions - Some Basic Concepts of Chemistry

NEET AIPMT Chemistry Chapter Wise Solutions – Some Basic Concepts of Chemistry

Contents

NEET AIPMT Chemistry Chapter Wise Solutions Physics Biology

1. Suppose the elements X and Y combine to form two compounds XY₂ and X3Y2 . When 0.1 mole of XY2 weighs 10 g and 0.05 mole of X₃Y₂weighs 9 g, the atomic weights of X and 7 are (NEET-II 2016)
(a) 40,30
(b) 60,40
(c) 20,30
(d) 30,20

2. What is the mass of the precipitate formed when 50 mL of 16.9% solution of AgN0₃ is mixed with 50 ml of 5.8% NaCl solution? (Ag = 107.8, N = 14, O = 16, Na = 23, Cl = 35.5) (2015)
(a) 3.5 g
(b) 7 g
(c) 14 g
(d) 28 g

3. If Avogadro number N_A , is changed from 6.022 x 10 ²³ mol ^-1 to 6.022 x 10 ²⁰ mol ^-1, this would change (2015)
(a) the mass of one mole of carbon
(b) the ratio of chemical species to each other in a balanced equation
(c) the ratio of elements to each other in a compound
(d) the definition of mass in units of grams.

4. The number of water molecules is maximum in (2015)
(a) 1.8 gram of water
(b) 18 gram of water
(c) 18 moles of water
(d) 18 molecules of water.

5. A mixture of gases contains H₂ and 02 gases in the ratio of 1 : 4 (w/w). What is the molar ratio of the two gases in the mixture? (2015, Cancelled)
(a) 16:1
(b) 2 : 1
(c) 1 : 4
(d) 4 : 1

6. Equal masses of H₂, 0₂ and methane have been taken in a container of volume V at temperature 27 °C in identical conditions. The ratio of the volumes of gases H₂ : 0₂ : methane would be (2014)
(a) 8 : 16 : 1
(b) 16 : 8 : 1
(c) 16 : 1 : 2
(d) 8 : 1 : 2

7. When 22.4 litres of H2(g) is mixed with 11.2 litres of Cl_2(g) each at S.T.P, the moles of HCl_(g)formed is equal to (2014)
(a) 1 mol of HCl_(g)
(b) 2 mol of HCl_(g)
(c) 0.5 mol of HCl_(g)
(d) 1.5 mol of HCl_(g)

8. 1.0 g of magnesium is burnt with 0.56 g 0₂ in a closed vessel. Which reactant is left in excess and how much? (At. wt. Mg = 24, 0=16) (2014)
(a) Mg, 0.16 g
(b) 0₂, 0.16 g
(c) Mg, 0.44 g
(d) 0_{2 ,} 0.28 g

9. 6.02 x 10²⁰ molecules of urea are present in 100 mL of its solution. The concentration of solution is (NEET 2013)
(a) 0.001 M
(b) 0.1 M
(c) 0.02 M
(d) 0.01 M

10. In an experiment it showed that 10 mL of 0.05 M solution of chloride required 10 mL of 0.1 M solution of AgN0₃, which of the following will be the formula of the chloride (X stands for the symbol of the element other than chlorine) (Karnataka NEET 2013)
(a) X₂Cl₂
(b) XCl₂
(c) XCl4
(d) X₂Cl

11. Which has the maximum number of molecules among the following? (Mains 2011)
(a) 44 g C0₂
(b) 48 g 0₃
(c) 8 g H₂
(d) 64 g S0₂

12. The number of atoms in 0.1 mol of a triatomic gas is (N_A = 6.02 x 10²³ mol^-1) (2010)
(a) 6.026 x 10²²
(b) 1.806 x 10²³
(c) 3.600 x 10²³
(d) 1.800 x 10²²

13. 25.3 g of sodium carbonate, Na₂C0₃ is dissolved in enough water to make 250 mL of solution. If sodium carbonate dissociates completely, molar concentration of sodium ion, Na+ and carbonate ions, CO₃^2-are respectively (Molar mass of Na₂C0₃ = 106 g mol^-1) (2010)
(a) 0.955 M and 1.910 M
(b) 1.910 M and 0.955 M
(c) 1.90 M and 1.910 M
(d) 0.477 M and 0.477 M

14. 10 g of hydrogen and 64 g of oxygen were filled in a steel vessel and exploded. Amount j of water produced in this reaction will be (2009)
(a) 3 mol
(b) 4 mol
(c) 1 mol
(d) 2 mol

15. What volume of oxygen gas (0₂) measured at 0°C and 1 atm, is needed to bum completely l L of propane gas (C₃H₈) measured under the same conditions? (2008)
(a) 5 L
(b) 10 L
(c) 7L
(d) 6 L

16. How many moles of lead (II) chloride will be formed from a reaction between 6.5 g of PbO and 3.2 g HCl? (2008)
(a) 0.011
(b) 0.029
(c) 0.044
(d) 0.333

17. 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 (2008)
(a) CHO
(b) CH₄O
(c) CH₃0
(d) CH₂0

18. An element, X has the following isotopic composition:
²⁰⁰X: 90%
¹⁹⁹X : 8.0%
²⁰²X: 2.0%
The weighted average atomic mass of the naturally occurring element X is closest to (2007)
(a) 201 amu
(b) 202 amu
(c) 199 amu
(d) 200 amu

19. The maximum number of molecules is present in (2004)
(a) 15 L of H₂ gas at STP
(b) 5 L of N₂ gas at STP
(c) 0.5 g of H₂ gas
(d) 10 g of 0₂ gas.

20. Which has maximum molecules? (2002)
(a) 7 g N₂
(b) 2 g H₂
(c) 16 g N0₂
(d) 16 gO₂

21. Percentage of Se in peroxidase anhydrous enzyme is 0.5% by weight (at. wt. = 78.4) then minimum molecular weight of peroxidase anhydrous enzyme is (2001)
(a) 1.568 x 10⁴
(b) 1.568 x 10³
(c) 15.68
(d) 2.136 x 10⁴

22. Molarity of liquid HCl, if density of solution is 1.17 g/cc is (2001)
(a) 36.5
(b) 18.25
(c) 32.05
(d) 42.10

23. Specific volume of cylindrical virus particle is 6.2 x 10^-2 cc/g whose radius and length are 7 A and 10 A respectively. If N_A = 6.02 x 10²³, find molecular weight of virus. (2001)
(a) 15.4 kg/mol
(b) 1.54 x 10⁴kg/mol
(c) 3.08 x 10⁴ kg/mol
(d) 3.08 x 10³kg/mol

24. In quantitative analysis of second group in laboratory, H₂S gas is passed in acidic medium for precipitation. When Cu²⁺ and Cd²⁺ react with KCN, then for product, true statement is (2000)
(a) K₂[CU(CN)₄] more soluble
(b) K₂[Cd(CN)₄] less stable
(c) K₃[Cu(CN)₂] less stable
(d) K₂[Cd(CN)₃] more stable.

25. Volume of C0₂ obtained by the complete decomposition of 9.85 g of BaC0₃ is (2000)
(a) 2.24 L
(b) 1.12 L
(c) 0.84 L
(d) 0.56 L

26. Oxidation numbers of A, B, C are +2, +5 and -2 respectively. Possible formula of compound is (2000)
(a) A₂(BC₂)₂
(b) A₃(BC₄)₂
(c) A₂(BC₃)₂
(d) A₃(B₂C)₂

27. The number of atoms in 4.25 g of NH₃ is approximately (1999)
(a) 4 x 10²³
(b) 2 x 20²³
(c) 1 x 10²³
(d) 6 x 10²³

28. Given the numbers: 161 cm, 0.161 cm, 0.0161 cm. The number of significant figures for the three numbers is (1998)
(a) 3, 3 and 4 respectively
(b) 3, 4 and 4 respectively
(c) 3, 4 and 5 respectively
(d) 3, 3 and 3 respectively.

29. Haemoglobin contains 0.334% of iron by weight. The molecular weight of haemoglobin is approximately 67200. The number of iron atoms (Atomic weight of Fe is 56) present in one molecule of haemoglobin is (1998)
(a) 4
(b) 6
(c) 3
(d) 2

30. In the reaction,4NH_3(g) + 50_2(g) —> 4NO_(g) + 6H₂0_(l)when 1 mole of ammonia and 1 mole of 0₂ are made to react to completion :
(a) All the oxygen will be consumed.
(b) 1.0 mole of NO will be produced.
(c) 1.0 mole of H₂0 is produced.
(d) All the ammonia will be consumed.
(1998)

31. Among the following which one is not paramagnetic? [Atomic numbers; Be = 4, Ne = 10, As = 33, Cl = 17] (1998)
(a) Ne²⁺
(b) Be⁺
(c) CF^–
(d) As⁺

32. 0.24 g of a volatile gas, upon vaporisation, gives 45 mL vapour at NTP. What will be the vapour density of the substance? (Density of H₂ = 0.089) (1996)
(a) 95.93
(b) 59.93
(c) 95.39
(d) 5.993

33. The amount of zinc required to produce 224 mL of H₂ at STP on treatment with dilute H₂S04 will be (1996)
(a) 65 g
(b) 0.065 g
(c) 0.65 g
(d) 6.5 g

34. The dimensions of pressure are the same as that of (1995)
(a) force per unit volume
(b) energy per unit volume
(c) force
(d) energy.

35. The number of moles of oxygen in one litre of air containing 21% oxygen by volume, under standard conditions, is (1995)
(a) 0.0093 mol
(b) 2.10 mol
(c) 0.186 mol
(d) 0.21 mol.

36. The total number of valence electrons in 4.2 g of N_3- ion is (N_A is the Avogadro’s number) (1994)
(a) 2.1 N_A
(b) 4.2 N_A
(c) 1.6 N_A
(d) 3.2 N_A

37. A 5 molar solution of H₂S0₄ is diluted from 1 litre to a volume of 10 litres, the normality of the solution will be (1991)
(a) 1 N
(b) 0.1 N
(c) 5 N
(d) 0.5 N

38. The number of gram molecules of oxygen in 6.2 x 10²⁴ CO molecules is (1990)
(a) 10 g molecules
(b) 5 g molecules
(c) 1 g molecules
(d) 0.5 g molecules.

39. Boron has two stable isotopes, ¹⁰B(19%) and ¹¹B(81%). Calculate average at. wt. of boron in the periodic table (1990)
(a) 10.8
(b) 10.2
(c) 11.2
(d) 10.0

40. The molecular weight of 0₂ and S0₂ are 32 and 64 respectively. At 15°C and 150 mmHg pressure, one litre of 0₂ contains N molecules. The number of molecules in two litres of S0₂ under the same conditions of temperature and pressure will be (1990)
(a) N/2
(b) N
(c) 2 N
d) 4 N

41. A metal oxide has the formula Z₂0₃. It can be reduced by hydrogen to give free metal and water. 0.1596 g of the metal oxide requires 6 mg of hydrogen for complete reduction. The atomic weight of the metal is (1989)
(a) 27.9
(b) 159.6
(c) 79.8
(d) 55.8

42. Ratio of C_p and C_v of a gas X is 1.4. The number of atoms of the gas ‘X’ present in 11.2 litres of it at NTP will be (1989)
(a) 6.02 x 10²³
(b) 1.2 x 10²³
(c) 3.01 x 10²³
(d) 2.01 x 10²³

43. What is the weight of oxygen required for the complete combustion of 2.8 kg of ethylene? (1989)
(a) 2.8 kg
(b) 6.4 kg
(c) 9.6 kg
(d) 96 kg

44. The number of oxygen atoms in 4.4 g of C0₂ is (1989)
(a) 1.2 x 10²³
(b) 6 x 10²³
(c) 6 x 10²³
(d) 12 x 10²³

45. At S.T.P. the density of CCl₄ vapour in g/L will be nearest to (1988)
(a) 6.87
(b) 3.42
(c) 10.26
(d) 4.57

46. One litre hard water contains 12.00 mg Mg²-. Milli-equivalents of washing soda required to remove its hardness is (1998)
(a) 1
(b) 12.16
(c) 1 x 10^-3
(d) 12.16 x 10^-3

47. 1 cc N₂0 at NTP contains (1998)
(a) 1.8/224 x 10²² atoms
(b) 6.02/22400 x 10²³ molecules
(c)1.32/224 x 10²³ electrons
(d) All the above.