ECAT Chemistry Online Test With Answers

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ECAT Chemistry Online Test

Sr. # Questions Answers Choice
1 Which is not a nucleophile Benzene Chlorine Ethene Ethanol
2 Which of the following is an electrophile Bromine KBr NH<sub>3</sub> Benzene
3 Which is not the poplar reaction
4 A free radical reaction takes place in three steps, initiation, propagation and terminations. Which of the following expression represents a propagation step
5 In a heterollytic bond fission reaction A molecule of H<sub>2</sub>O is formed A molecule of H<sub>2</sub>O is eliminated A free radical is formed A positive and a negative ion is formed
6 Which of the following expressions show a heterolytic bond fission
7 Which reaction produces a free radical SN reaction Homelytic fission reaction Heterolytic fission reaction Addition reaction
8 Which statement is true about a free radical An atom with a positive charge An atom with a negative charge An atom with a lone pair of electrons An atom with unpaired electron
9 A transition element is defined as an element of 3d series Which is metal Which has one stable ion Which has two stable ions Which has at least one stable ion with incomplete d-orbital
10 Which element has 4 unpaired electrons in 3d-orbital Chromium - 24 Manganese - 25 Iron - 26 Cobalt - 27
11 Which is the correct electronic configuration of Cr - 24 1s<sup>2</sup>, 2s<sup>2</sup>, 2p<sup>6</sup>, 3s<sup>2</sup>, 3p<sup>6</sup>, 3d<sup>4</sup>, 4s<sup>2</sup> 1s<sup>2</sup>, 2s<sup>2</sup>, 2p<sup>6</sup>, 3s<sup>2</sup>, 3p<sup>6</sup>, 3d<sup>3</sup>, 4s<sup>2</sup>, 4p<sup>1</sup> 1s<sup>2</sup>, 2s<sup>2</sup>, 2p<sup>6</sup>, 3s<sup>2</sup>, 3p<sup>6</sup>, 3d<sup>5</sup>, 4s<sup>1</sup> 1s<sup>2</sup>, 2s<sup>2</sup>, 2p<sup>6</sup>, 3s<sup>2</sup>, 3p<sup>6</sup>, 3d<sup>5</sup>, 4p<sup>1</sup>
12 Transition elements differ from s and p block elements due to their characteristic properties. What is not he characteristic property of transition elements Transition elements show variable oxidation states Their salts are coloured They can be used as catalyst All of them are metals
13 Potassium ferrocyanide is a Mixed salt Double salt Complex salt Normal salt
14 Which alloy contains 50% copper, 25% zinc and 25% nickel German silver Gun metal Bell metal Brass
15 Bronze is an alloy which contains 60% cu 70% cu 80% cu 99% cu
16 Transition elements form which type of bond Ionic bonds only Covalent bonds only Ionic and covalent bonds Polar bonds
17 E.D.T.A is Mono-dentate Bi-dentate Polydentate Having three lone pairs of electrons
18 In physical and chemical properties, transition elements show Similarities Dissimilarities Both of these Somestimes similarities, sometimes dissimilarities
19 The elements in which d or f-orbitals are incomplete are called Transition elements Typical elements Actinides lanthanides
20 What are alloys A homogenous mixture of two or more elements A homohenous mixture of metal and a non-metal A homogenous mixture of two or more metals None of the above
21 Elements in which f-orbitals are in the process of completion are called Outer transition element Inner transition elements Non-tranistion elements Radioactive elements
22 Which one of the following has highest density Zn Os Ni Cu
23 The total number of transition elements is 10 14 40 50
24 Coordination number of Pt in [Pt Cl(NO2) (NH3)]2-is 2- 4 1 6
25 The colour of transition metal complexes is due to d-d transitions of electrons Para magnetic nature of transition elements Ionization Loss of s-electrons
26 Which of the following is a not typical transition element Cr Mn Zn Fe
27 An oxidixing agent K<sub>2</sub>Cr<sub>2</sub>O<sub>7</sub> H<sub>2</sub>SO<sub>4</sub> FeSO<sub>4</sub> K<sub>2</sub>SO<sub>4</sub>
28 Potassium chromate has formula KClO<sub>3</sub> K<sub>2</sub>CO<sub>3</sub> K<sub>2</sub>CrO<sub>4</sub> K<sub>2</sub>Cr<sub>2</sub>O<sub>7</sub>
29 Calcium carbide reacts with water to produce Acetylene Methane Ethylene Ethane
30 Where lime is not used In refining or metals In paper industry In glass industry In the preparation of NaOH
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