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66. When the reaction Pb(N03) 2→ 2PbO + N02 + 02is balanced the coefficients of the reactants and products in the balanced reaction will be
4, 2, 1, 2
2, 2, 4, 1
2, 4, 1, 2
4, 2, 2, 2, 1
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67. Shyam and Hari have 2 identical pieces of marble chips with same mass. They take equal volumes of dil. HCI with the same concentration in two different test tubes. Shyam puts the marble piece directly into the acid whereas Hari powdered the marble piece and puts it into the test tube. What will be the correct observation made? (NTSE Tamil Nadu, Stage-I, 2016-17)
Reaction in Shyam's test tube will be faster
Reaction in Hari's test tube will be faster
Both reactions will happen in the same speed
No reaction happens in both the test tubes
68. For the following reaction which statement is true? 2H2S(g) + S02(g) → 3S(s) + 2H20(I) (a) H2S is reduced (b) S02 is oxidised (c) H2S is reducing agent (d) S02 is oxidizing agent (NTSE Maharashtra, Stage-I, 2016-17)
(a) and (c)
(b) and (c)
(a) and (b)
(c) and (d)
69. A science teacher wrote 3 statements about rancidity: (i) When fats and oils are reduced, they become rancid (ii) In chips packet, rancidity is prevented by adding oxygen (iii) Rancidity is prevented by adding antioxidants Select the correct option: (NTSE Maharashtra, Stage-I, 2016-17)
(i)
(ii) and (iii)
(iii)
(i), (ii) and (iii)
70. Which information is not conveyed by a balanced chemical equation? (NTSE Jharkhand, Stage-I, 2016-17)
Physical quantity of reactants and products
Symbols and formula of all the substances involved in a particular reaction
Number of atoms/molecules of the reactants and products formed
Whether a particular reaction is actually feasible or not
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