41. How many structural isomers can be formed by butane (C4H10)?
(A) 1
(B) 2
(C) 3
(D) 4
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42. What is the unit of density?
(A) mole/litre
(B) kg m-3
(C) gram cm-3
(D) both (B) and (C)
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43. Which of the following molecular compounds represents a correct chemical formula ?
(A) Calcium chloride – CaCl
(B) Hydrogen sulphide – H2S
(C) Sodium sulphate – NaSO4
(D) Sodium sulphide – NaS
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44. What is the chemical formula of Plaster of Paris ? Show Answer Hide Answer
(A) CaSO4
(B) CaSO4.½H2O
(C) CaSO4. 2H2O
(D) Ca(OH)2
45. How many number of moles are present in 128g of S02?
(A) 01
(B) 02
(C) 03
(D) 04
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46 Name the gas present in cooking gas cylinders in home.
(A) Compressed Natural Gas
(B) Liquified Petroleum Gag
(C) Liquified Hydrogen Gas
(D) Liquified Carbon dioxide Gas
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47. The atomic radius decreases on moving from left to right along period
(A) Due to increase in nuclear charge
(B) Due to decrease in nuclear charge
(C) Due decrease in atomic number
(D) Due to increase in atomic nunber
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48. Which of the following is used as anode in the electrolytic refining?
(A) Pure metal
(B) Impure metal
(C) Non-metal
(D) Metalloids
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49. The isotope of which of the following element is used in the treatment of cancer?
(A) Iodine
(B) Uranium
(C) Cobalt
(D) Zinc
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50. The given reaction is an example of
NaHCO3 + HCl ⟶ NaCl + H2O + CO2
(A) Simple displacement
(B) Neutralisation
(C) Decomposition
(D) None of the above
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51. Which of the following is acidic in nature?
(A) Antacid
(B) Lemon juices
(C) Human blood
(D) Milk of magnesia
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52. The general formula for alkene is
(A) CnH2n
(B) CnH2n + 2
(C) CnHn
(D) CnH2n – 2
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53. Evaporation increases with
i. Increase in surface area
ii. Increase in temperature
iii. Decrease in humidity
iv. Increase in wind speed
Choose the correct option from the following:
(A) i, ii, iii and iv
(B) Only ii
(C) Only iii
(D) Only iv
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54. The chemical formula of bleaching powder is
(A) Ca(OH)2
(B) CaCl2
(C) CaCO3
(D) CaOCl2
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55. Identify the oxidised and reduced substance in the following reaction:
CuO + H2 → Cu + H2O
(A) CuO is oxidised and H2 is reduced
(B) CuO is reduced and H2 is oxidised
(C) Only CuO is oxidised
(D) Only H2 is reduced
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56. Find the ratio of mass of combining elements in water (H2O).
(A) 1:8
(B) 8:1
(C) 1:1
(D) 2:1
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57. Arrange the following elements in the decreasing order of their metallic character:
Na, Si, Cl, Mg, Al
(A) Na > Mg > Al > Si > Cl
(B) Al> Na > Mg > Si > Cl
(C) Mg> Na > Al > Si > Cl
(D) Si > Na > Mg > Al > Cl
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58. Propane, with the molecular formula, C3H8 has
(A) 11 covalent bonds
(B) 10 covalent bonds
(C) 12 covalent bonds
(D) 09 covalent bonds
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59. The atomicity of sulphur is
(A) Monoatomic
(B) Diatomic
(C) Tetraatomic
(D) Polyatomic
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60. Buckminster fullerene is an allotropic form of
(A) Phosphorus
(B) Sulphur
(C) Carbon
(D) Tin
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