ECAT Chemistry Online Test With Answers

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ECAT Chemistry Online Test

Sr. # Questions Answers Choice
1 The electronic configuration of an atom/ion can be defined by the following Aufbau principle Pauli's exclusion principle Hund's Rule All the above
2 Number of neutrons in heavy hydrogen atom is 0 1 2 3
3 The number of spherical nodes in 3p orbitals are One Three Non Two
4 The spectrum of helium is expected to be similar to that of H Li<sup>+</sup> Na He<sup>+</sup>
5 Subsidiary quantum number specifies size of orbital shape of orbital orientations of orbitals Nuclear stability
6 Sodium chloride imparts a yellow colour to the Bunsen flame. This can be interpreted due to the low ionization energy of sodium sublimation of metallic sodium to give yellow vapour emission of excess energy absorbed as a radiation in the visible region as a radiation in the visible region photosenitivity
7 The number of neutrons in the element 94Be is 4 5 9 13
8 The valence orbital configuration of an element with atomic number 23 is 3d<sup>5</sup> 3d<sup>3</sup>, 4s<sup>2</sup> 3d<sup>3</sup>, 4s<sup>1</sup>, 4p<sup>1</sup> 3d<sup>2</sup>,4s<sup>2</sup>,4p<sup>1</sup>
9 Which quantum number is sufficient to describe the electron is hydrogen atom? l n m s
10 When electrons revolve in stationary orbits There is no change in energy level They vecome stationary They are gaining kinetic energy There is increase in energy
11 The symbol of the element whose atoms have the outer most electronic configuration 2s22p3is N Li P Na
12 The number of electrons in the M shell of the element with atomic number 24 is 24 12 13 8
13 The maximum number of electrons in a subshell for which l = 3 is 14 10 8 4
14 The ratio of the ionization energy of H and Be3+is 1 : 1 1 : 3 1 : 9 1 : 16
15 The mass of the neutron is of the order of 10<sup>-23 </sup>kg 10<sup>-24</sup>kg 10<sup>-26</sup>kg 10<sup>-27</sup>kg
16 The credit of discovering neutron goes to Rutherford Langmuir Chadwick Austen
17 With increasing principle quantum number, the energy difference between adjacent energy levels in H atom Decreases Increases Remains constant Decreases for low value of Z and increase for higher value of Z
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19 What is not true about DNA It preserve genetic information To relicates Synthesized protein It has a linear structure
20 RNA is a polymer of nucleotide which consist of three components. Which one is not the component in the nucleotide of an RNA D-Ribose Wracil base Prosphate group Thyamine base
21 DNA is a polynucleic acid. The monomer is known as a nucleotide. What is not the component of the nucleoptide Phosphate group Deoxy ribose sugar Uracil base Adenine base
22 Enzymes catalyse all biological reactions occurring in the cell. What is true about an enzyme Enzyme is a small molecule Enzyme is acidic in nature Enzyme is a protein Enzyme is a lipid
23 There are 20 amino acids found in protein which is not the property of these amino acids They are all<span style="color: rgb(34, 34, 34); font-family: &quot;Times New Roman&quot;; font-size: 24px; text-align: center; background-color: rgb(255, 255, 248);"><i>α</i></span>-amino acids They are all optically active They have high decomposition point They are water soluble
24 Which functional group is present in glycerol tristearate Carboxylic acid Alcohol Aldehyde Ester
25 At what pH glycine shows the structure H3N+-- CH2-- COOH 2 7 10 14
26 Glycine at pH7 has the structure H<sub>2</sub>N -- CH<sub>2 </sub>-- COOH H<sub>3</sub>N<sup>+</sup>-- CH<sub>2</sub>-- COOH H<sub>2</sub>N -- CH<sub>2</sub>COO<sup>-</sup> H<sub>3</sub>N<sup>+</sup>-- CH<sub>2</sub>-- COO<sup>-</sup>
27 Which teat is not given by both glucose and fructose Give yellow ppt of CHl<sub>3</sub>with alkaline aqueous iodine With 2, 4-DNPH give yellow ppt of hydrazone Evolve H<sub>2</sub>gas with Na metal Oxidised with [Ag(NH<sub>3</sub>)<sub>2</sub>]<sup>+</sup>i.e. Tollen's reagent
28 A nucleoside may be Ribonuleoside Deoxyribonucleoside Both a and b None
29 The proteins which are derived by conjugated proteins are called as Simple protein Complex protein Derived protein None
30 How is the secondary structure of protein stabilized Through hydrogen bonding Through ionic bonding Through van der wall forces Through covalent bonding
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