ECAT Chemistry Online Test With Answers

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ECAT Chemistry Online Test

Sr. # Questions Answers Choice
1 The isotopes of an element Possess same mass number Possess same number of protons Do not possess same chemical properties May or may not possess same chemical properties
2 The negatively charged particles are called Cation Radical Anion Positron
3 Macromolecules are organic molecules High molecular mass molecules Natural compounds Rarely occurring molecules
4 8 g 16 g 32 g 24 g
5 The number of moles of CO2which contain 8.0 g of oxygen 0.25 0.50 1.0 1.50
6 99.2% 99.5% 90.5% 96.2%
7 84.84 % 89.89% 81.81% 90.90%
8 0.5 mole of CH4and 0.5 mole of SO2gases have equal Volume Mass in grams Total number of atoms Number of molecules
9 One of the following statements is incorrect Actual yeild is always less than the theoretical yield The formula of a compound is not definite Law of conservation of mass is applied in stoictiometry Boyles law is applied in stoichiometry
10 The quantitative relationship between the substances according to balanced equation describes Reversible reactions Stoichiometry Limiting reacting Percentage composition
11 N<sub>2</sub>O<sub>4</sub>is limiting reactant N<sub>2</sub>H<sub>4</sub>is the limiting reactant Reactants are completely converted to the products Reactions is reversible
12 Which one of the following step is not involved in determination of empirical formula Determination % of each element Determination of gram atom of each element Determination of isotopes of each element Determination of atomic ratio of element
13 A beaker contains 9 grams of water. The number of H-atoms is 6.02 x 1023 3.01 x 1023 6.02 x 1024 3.01 x 1024
14 1.12 dm3of N2gas at S.T.P. has mass of N2gas 2.8 g 2.4 g 1.4 g 14 g
15 32 g 3.2 g 5.6 g 9.6 g
16 The mass of Al2S3formed when 20 grams Al reacts completely with S is 60 g 50 g 50.55 g 55.55 g
17 The mass of sulphur which combines with 24 grams oxygen to form SO2 32 gram 24 gram 8 gram 12 gram
18 Soil remediation means To make it suitable for cultivation of crops To make it acidic To make it alkeline To add manure into it
19 One of the environmental problem is the formation of oil slicks when oil is spilled from tankers in sea water. Which treatment is suitable to remove oil slicks Blow air Add Na<sub>2</sub>CO<sub>3</sub> Use a specially made sorbent having flouring trapped in it Use a sorbent having Al<sub>2</sub>O<sub>3</sub>trapped in it
20 Ecology is a science of environment and deals specially with Stratosphere Biosphere Lithosphere Hydrosphere
21 Contamination of Hg comes into surface water from chlor industrial wastes. Why is Hg toxic It attaches to sulphur of the disulphide link Hg is a heavy metal Hg is liquid at room temperature Hg is non reactive chemically
22 To purify water which has mud dissolved in it, A substance which coagulates the suspended particles is used. The coagulant may be Ag<sup>+</sup> Cu<sup>2+</sup> Al<sup>3+</sup> Si<sup>4+</sup>
23 Water which his considered to be safe for human consumption is known as Distilled water Contaminated water Potable water Rain water
24 What is the cause of water pollution Chemical and bacterial contents in live stock The spilled oil in rivers and ponds Wide spread use of pesticides All of the above
25 Ground and surface waters are contaminated and become polluted due to the human activity. Which human activity will bot cause water pollution Live stock waste Agricultural pesticides Oil breaks and spills All of the above
26 Chlorofluorocarbon, CF2CI2, plays an effective role in removing O3(ozone) in the stratosphere. Which reaction does not cause the depletion of ozone
27 Which is not the condition for the formation of smog There must be sufficient NO gas There must be sunlight to help photo chemical reaction to take place Air must be blowing swiftly There must be SO<sub>2</sub>in the air
28 Acid rain is caused when various atmospheric gases dissolve in rain water. What are the gases that cause rain water SO<sub>2</sub> NO<sub>2</sub> CO A and b only
29 The pH of the rain water in areas where acid rain is the cause of pollution may be 6.5 5.6 4.5 2.2
30 NO and NO2gases in atmosphere are represented by NO NO<sub>4</sub> NO<sub>x</sub> N<sub>x</sub>O<sub>y</sub>
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