ECAT Chemistry Online Test With Answers

ECAT Chemistry Online Test

Sr. # Questions Answers Choice
1 All the elements belongs to the 2nd period are Normal elements Transition elements Stable elements Halogens
2 According to Mendeleev, the properties of the elements are periodic function of their Atomic number Atomic volumes Atomic masses Atomic densities
3 Who gave the concept of atomic number Newton Mosley Dalton Newland
4 The classify the elements, Newland gave the idea of Octaves Triads Atomic volume Atomic mass
5 The statement that the properties of every eight elements are similar to the first is the law of Dobereiner Newland Mendeleev L. Meyer
6 From 39Y to 48Cd are called Transition elements Outer transition elements Inner transition elements 2nd transition series
7 Which of the following is not true for metalloids They are borderline elements that exhibit both metallic and non-metallic properties to some extent They usually act as electron donors with non-metals and as electron acceptors with metals Some of these elements are boron, silicon and germanium They are good conductors of heat and electricity
8 Indicate the correct statement All lanthanidees are present in the same group All halogens are present in the same period All the alkali metals are present in the same group All the noble gases are present int he same period
9 2 3 4 9
10 If the rate of reaction is independent of the concentration of the reactant, the reaction is of Zero order First order Second order Third order
11 The addition of a catalyst to a reaction changes the Enthalpy Entropy Nature of reactants Energy of activation
12 Which of the following factors does not influenced the rate of reaction Concentration of the reaction Nature of the reactants Molecularity of the reaction Temperature
13 The experimental relationship between a reaction rate and the concentration of reactants is known as Order Molecularity Rate constant Rate law
14 The number of atoms or molecules whose concentrations determine the rate of the reaction is called Molecularity Order Rate of reaction Rate constant
15 ______ are called biocatalysts Organic acids Organic bases Enzymes All
16 Complex protein molecules which catalyses the organic reactions in the living cells are called Living organisms Enzymes Viruses Bacteria
17 Diastase Lipase Inverters Zymase
18 When copper is allowed to react with HNO3, the reaction is slow in the beginning, finally becomes very fast. It is due to the formation of an auto catalyst which is Cu(NO<sub>3</sub>)<sub>2</sub> CuO O<sub>2</sub> HNO<sub>2</sub>
19 In the reaction of oxalic acid with KMnO4and H2SO4is slow at the beginning but after sometimes the reaction becomes faster due to Formation of MnSO<sub>4</sub>which acts as 'Auto catalyst Formation of CO<sub>2</sub>which acts as 'Auto catalyst Formation of K<sub>2</sub>SO<sub>4</sub>which acts as 'Auto catalyst Evolution of O<sub>2</sub>gas which acts as 'Auto catalyst
20 Hydrogenation of vegetable oils is accelerated by Ni catalyst. The catalytic activity of Bi is increased by a promoter of activator which is Na and K Na and Hg Hg and Zn Cu and Te
21 In the manufacture of NH3by Haber's process catalyst used is iron its catalytic efficiency is poisoned by Presence of Al<sub>2</sub>O<sub>3</sub> Presence of Cr<sub>2</sub>O<sub>3</sub> MnO<sub>2</sub> CO present with H<sub>2</sub>gas
22 The catalytic activity of Pt is much higher when It is mixed with asbestos It is mixed with Pd It is mixed with arsenic In is made colloidal platinum
23 The effective activity of a metal catalyst is increased if it is in Solid form Liquid state Gaseous state Finely divided form
24 Homogeneous Heterogeneous Isogeneous None
25 Platinum is poisoned by Arsenic Silver Argon Zinc
26 which one of the following is a heteroheneous catalysis
27 Homogenous catalysis is that in which catalyst and reactants are in same phase. Which one of the following reaction is a homogenous catalysis
28 A catalyst is a substance which increase the rate of a chemical reaction, but remains unchanged at the end of reaction, nut remains unchanged at the end of reaction, because It increases the temperature It increase the surface area It increases the rate constant It decrease the energy energy of activation
29 The solubility product of Ca(OH)2is 6.5 x 10-6. The concentration of OH-ions is 1.175 x 10<sup>-2</sup> 2.35 x 10<sup>-2</sup> 3.25 x 10<sup>-3</sup> 3.25 x 10<sup>-4</sup>
30 The solubility of PbF2is 2.6 x 10-3mole dm-3 then its solubility product is 2.6 x 10<sup>-3</sup> 6.76 x 10<sup>-6</sup> 5.2 x 10<sup>-6</sup> 7.0 x 10<sup>-8</sup>
Download This Set

Is this page helpful?