ECAT Chemistry Online Test With Answers

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ECAT Chemistry Online Test

Sr. # Questions Answers Choice
1 Lime, calcium oxide, is used in agriculture for Adding ca metal in soil Making soil acidic Neutralizing acidic soil Adding oxygen to soil
2 Plaster of pares is obtained by heating Gypsum Epsom Lime stone Dolomite
3 Gypsum is applied to the soil to provide calcium and Oxygen Nitrogen Phosphorous Sulphur
4 Down's cell is used to prepare Sodium carbonate Sodium bicarbonate Sodium metal Sodium hydroxide
5 The ore CaSO42H2O has the general name Gypsum Dolomite Calcite Epsom salt
6 Chile saltpetre has the chemical formula NaNO<sub>3</sub> KNO<sub>3</sub> Na<sub>2</sub>B<sub>4</sub>O<sub>7</sub> Na<sub>2</sub>CO<sub>3</sub>H<sub>2</sub>O
7 The element caesium bears resemblance with Ca Cr Rubidium None of the above
8 Which of the following sulphates is not soluble in water Sodium sulphate Potassium sulphate Zinc sulphate Barium sulphate
9 Which one of the following is not an alkali metal Francium Caesium Rubidium Radium
10 Which will have the maximum value of heat of hydration Na<sup>+</sup> Cs<sup>+</sup> Ba<sup>+2</sup> Mg<sup>+2</sup>
11 The oxide of beryllium is Acidic Amphoteric Superoxide Basic
12 Which one of the following does not belong to alkaline earth metals Be Ra Ba Rn
13 Alkaline earth metals are usually Reducing agent Oxidizing agent Amphoteric Acidic
14 Which of the following compound is industrially prepared by the electrolysis of solution of NaCl Na<sub>2</sub>CO<sub>3</sub> NaHCO3 NaOH NaOCl
15 Baking powder has which one of the following formula Na<sub>2</sub>CO<sub>3</sub> Na<sub>2</sub>SO<sub>4</sub> NaHCO<sub>3</sub> K<sub>2</sub>CO<sub>3</sub>
16 The silver bromide in hypo (Na2S2O3) solution is Soluble Not soluble Precipitated Not effect
17 Which metal of Group-II A of the periodic Table, will form the least ionic chloride Be Mg Ca Sr
18 Solvay process is used in the manufacture of Na<sub>2</sub>CO<sub>3</sub> NaHCO<sub>3</sub> CaCl<sub>2</sub> All
19 Francium is an element at the bottom of Group I in the Periodic Table. Which one of the following predication is likely to be correct? It will react with water to liberate oxygen Its hydroxide will be a strong alkali in water Its carbonate will decompose on heating to give carbon dioxide Its nitrate on heating will give nitrogen dioxide and oxygen
20 The chloride of element Q is hydrolysed by water to form an acidic solution and its oxide reacts with acid to form a salt.
What cold be the element Q
 Magnesium Aluminium Silicon Phosphorus
21 Which statement explains the observation that magnesium hydroxide dissolve in aqueous ammonium chloride, but not in aqueous sodium chloride The ionic radius of the NH<sub>4</sub><sup>+</sup>ion is similar to that of Mg<sup>2+</sup>but not that of Na<sup>+</sup> NH<sub>4</sub>Cl dissociates less fully than NaCl The ions Na<sup>+</sup>and Mg<sup>2+</sup>are isoelectronic (have the same number of electrons) The ion NH<sup>+</sup><sub>4</sub>acts as an acid
22 An element of the third period (Na to S) is heated in chlorine. The product is purified and then added to water. The resulting solution is found to be neutral. What is the element Sodium Aluminium Silicon Phosphorus
23 Which of the following oxides is unlikely to dissolve in aqueous hydroxide Al<sub>2</sub>O<sub>3</sub> MgO SO<sub>2</sub> SIO<sub>2</sub>
24 Which species represented by the following formula has the largest radius P<sup>3-</sup> Cl<sup>-</sup> A<sub>r</sub> K<sup>+</sup>
25 NaBH4and LialH4are Ionic hydrides Covalent hydrides Interposal hydrides Complex hydrides
26 Ionization potential increases in moving from left to right in a period Because nuclear charge increase Because atomic size decrease Both (a) and (b) Because atomic size increases
27 NaH is Ionic hydride Complex hydride Covalent hydride Interstitial hydride
28 Ionic hydrides are generally Liquid at room temperature Good electrical conductors Good reducing agents Easily reduced
29 Li, Be, B, C, O, Fl Ne are elements of Second period First period Third period Fourth period
30 The elements of sub-group A are called Transition elements Main elements Typical elements Rare earth elements
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