Last seen: Oct 19, 2020
(b) 1.6 M Explanation: HCl(0.4 moles) ⇌ H+ + Cl- CaCl2(0.2 moles) ⇌ Ca2+ + 2Cl-(2 x 0.2 = 0.4 moles) Total Cl- moles = 0.4 + 0.4 = 0.8 moles ...
(c) C6H12O6 Explanation: Empirical formula weight = 12 + 2 + 16 = 30 n = 180/30 = 6 Molecular formula = (CH2O)6 = C6H12O6
(d) N/8 Explanation: Normality of a mixture of two or more acids is given by N = N1V1 + N2V2/V1 + V2 = (1/5 x 10 + 1/10 x 30)/10 + 30 = 5/4...
(a) 0.1 moles/litre Explanation: Molar concentration = Mole/Vol. in L = (20/40)/5 = 20/5 x 40 = 0.1 moles/litre
(a) CH2O Explanation: Ratio of no. of atoms = 24/12 : 4/1 : 32/16 = 2 : 4 : 2 = 1 : 2 : 1 Empirical formula = CH2O.
(b) 3.82 Explanation: Equivalent weight of an element is its weight which reacts with 8 gm of oxygen to form oxide. Thus eq. weight of the give...
(a) 3.01 x 1012 Explanation: No. of molecules = 6.02 x 1023 x 1.12 x 10-7/22400 = 6.02 x 10-7 x 1.12 x 1023/2.24 x 104 = 3.01 x 1012
(c) 2.656 × 10-23 g Explanation: Weight of single atom of oxygen = 16/6.02 x 1023 = 2.656 × 10-23 g
(b) If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion. Explanation: Eutrophication is a natural pro...
(b) If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion. Explanation: Methane is produced by incomple...
(a) If both Assertion and Reason are correct and Reason is the correct explanation of Assertion. Explanation: Water pollutants are commonly measur...
(a) If both Assertion and Reason are correct and Reason is the correct explanation of Assertion. Explanation: Excess of nitrates in drinking water...
(a) If both Assertion and Reason are correct and Reason is the correct explanation of Assertion. Explanation: Biotic or ecological succession is t...
(b) If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion. Explanation: Stratosphere zone of Earth's a...
(d) If both the Assertion and Reason are incorrect. Explanation: Pollution may be defined as an undesirable change in physical, chemical or biolog...
(b) If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion. Explanation: Wetland and rice fields are th...
(c) If the Assertion is correct but Reason is incorrect. Explanation: Ozone in stratosphere is responsible for the protection of earth from high e...
(b) If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion. Explanation: Deforestation results in incre...
(b) If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion. Explanation: Global warming is due to the i...
(b) If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion. Explanation: Catalytic converters are invol...