ECAT Chemistry MCQ's Test For Full Book With Answers

ECAT Chemistry MCQ's Test For Full Book

Sr. # Questions Answers Choice
1 A free radical reaction takes place in three steps, initiation, propagation and terminations. Which of the following expression represents a propagation step
2 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
3 Which of the following expressions show a heterolytic bond fission
4 Which reaction produces a free radical SN reaction Homelytic fission reaction Heterolytic fission reaction Addition reaction
5 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
6 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
7 Which element has 4 unpaired electrons in 3d-orbital Chromium - 24 Manganese - 25 Iron - 26 Cobalt - 27
8 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>
9 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
10 Potassium ferrocyanide is a Mixed salt Double salt Complex salt Normal salt
11 Which alloy contains 50% copper, 25% zinc and 25% nickel German silver Gun metal Bell metal Brass
12 Bronze is an alloy which contains 60% cu 70% cu 80% cu 99% cu
13 Transition elements form which type of bond Ionic bonds only Covalent bonds only Ionic and covalent bonds Polar bonds
14 E.D.T.A is Mono-dentate Bi-dentate Polydentate Having three lone pairs of electrons
15 In physical and chemical properties, transition elements show Similarities Dissimilarities Both of these Somestimes similarities, sometimes dissimilarities
16 The elements in which d or f-orbitals are incomplete are called Transition elements Typical elements Actinides lanthanides
17 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
18 Elements in which f-orbitals are in the process of completion are called Outer transition element Inner transition elements Non-tranistion elements Radioactive elements
19 Which one of the following has highest density Zn Os Ni Cu
20 The total number of transition elements is 10 14 40 50
21 Coordination number of Pt in [Pt Cl(NO2) (NH3)]2-is 2- 4 1 6
22 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
23 Which of the following is a not typical transition element Cr Mn Zn Fe
24 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>
25 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>
26 Calcium carbide reacts with water to produce Acetylene Methane Ethylene Ethane
27 Where lime is not used In refining or metals In paper industry In glass industry In the preparation of NaOH
28 Lime, calcium oxide, is used in agriculture for Adding ca metal in soil Making soil acidic Neutralizing acidic soil Adding oxygen to soil
29 Plaster of pares is obtained by heating Gypsum Epsom Lime stone Dolomite
30 Gypsum is applied to the soil to provide calcium and Oxygen Nitrogen Phosphorous Sulphur
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