ECAT Chemistry Online Test With Answers

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ECAT Chemistry Online Test

Sr. # Questions Answers Choice
1 Fe+3and Mn2+are strong paramagnetic because the number of unpaired electrons in each is 4 5 6 7
2 d-block elements closely resemble in their physical and chemical properties. Which statement is incorrect They show variable valency Their ions and compounds are coloured They are good conductors of heat and electricity Their compounds are diamagnetic
3 CuSO4. 5H2O is used to prepare Transition complex Fehling's 'A' sol Fehling's 'B' sol Fehling's sol
4 IIB elements (Zn, Cd, Hg) and III B elements (Sc, Y and La) are Non typical transition element Typical transition element Normal elements Inner transition element
5 Which element belong to 5d series V Nb Pd Hf
6 Which element does not belong to 4d series Y Zr Mo Zn
7 Which element does not belong to 3d transition series Ti V Mn Te
8 In the electronic configuration of Cr one electron from 4s sub-shell is transfered to 3d sub-shell because The 3rd orbital is of lower energy than 4s The 4s orbital is of equal energy to 3d orbital The half filled d-subshell is more stable than incomplete d-sub shell 6 unpaired electrons make Cr more paramagnetic
9 Which element has highest oxidation potential Li Be Ba Ra
10 Which of the following sulphates has the highest solubility in water BaSO<sub>4</sub> CaSO<sub>4</sub> MgSO<sub>4</sub> BeSO<sub>4</sub>
11 The chemical formula of Trona is KCl . MgCl<sub>2</sub>. 6H<sub>2</sub>O Na<sub>2</sub>CO<sub>3</sub>. 2NaHCO<sub>3</sub>. 2H<sub>2</sub>O Na<sub>2</sub>CO<sub>3</sub>. H<sub>2</sub>O KCl
12 Commercial common salt becomes slight damp on storing because Common salt is hygroscope Common salt contains some impurity, which is hygroscopic Salt in efflorescent Salt is crystalline
13 Sodium should be stored in Air free from moisture Air free form carbon dioxide Under water Under kerosene oil
14 Sodium is manufacture by the electrolysis of fused sodium chloride and not from an aqueous solution of sodium chloride because Sodium chloride does not ionize in the water solution Sodium chloride is not soluble in water Sodium deposited at the cathode may react with water to form sodium hydroxide Electricity does not pass through aqueous NaCl
15 Which of the following statement is not related to Solvay's process of Na2CO3 Cheap materials Pure product Continuous process Harmful by-products
16 Which of the following equations represents the action of heat on NaHCO3
17 Some of the elements of a period show similar behavior with the elements of next group in next period this is called Vertical relationship Oblique relationship Diagonal relationship None
18 Which one of the following equations represent the reaction that occurs when calcium nitrate is heated strongly
19 Marble is chemically CaCl<sub>2</sub> CaCO<sub>3</sub> Na<sub>2</sub>CO<sub>3</sub> NaHCO<sub>3</sub>
20 Which salt is used for preserving food BaCl<sub>2</sub> CaCl<sub>2</sub> NaCl Na<sub>2</sub>SO<sub>4</sub>
21 Which salt is used for the treatment of hyperacidity in stomach NaCl KCl NaHCO<sub>3</sub> Na<sub>2</sub>CO<sub>3</sub>
22 Which of the following salt is used as purgative CaSO<sub>4</sub> MgSO<sub>4</sub> BeSO<sub>4</sub> NaCl
23 The chemical formula of Epson salt is MgSO<sub>4</sub> MgCl<sub>2</sub> MgSO<sub>4</sub>. 7H<sub>2</sub>O MgCl<sub>2</sub>. 7H<sub>2</sub>O
24 NaHCO3is prepared by Down's process Solvay's process Nelson's process None of these
25 Sodium is never found free in nature because of its Chemical reactivity Small ionic size Small atomic volume None of these
26 Which of the following are electropositive in nature Alkali metals Alkaline earth metals Halogens Alkali and alkaline earth metals
27 The oxidation number of each element of group ll-A is 0 +1 +2 -1
28 The oxidation number of each element of group l-A is 0 +1 +2 -1
29 Which of the following element is most reactive Li Na K Cs
30 Sodium forms largely Normal oxides Per-oxides Superoxides None of these
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