ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

The boiling point of heavy water is

• 108°C A
• 101.4°C B
• 99°C C
• 110°C D

A compound contains one atom of oxygen and % of O 34.78, then molecular mass of compound is

• 46 A
• 78 B
• 110 C
• 180 D

• Introduction of an inert gas at constant volume A
• Introduction of PCl₃(g) at constant B
• Introduction of PCl₅(g) at constant volume C
• Introduction of Cl₂at constant volume D

Cyanoform is ________ acid in nature than the chloroform. The missing word is

• Stronger A
• Weaker B
• Amphoteric C
• Neutral D

During redox reaction an oxidizing agent

• Gains electrons A
• Is oxidized B
• Loses electrons C
• Hydrolysed D

The alkyl halide molecule on which a nucleophile attacks is called

• Substrate A
• Subsituent B
• Substituted C
• All of these D

Which is more active ?

• Alkanes A
• Alkenes B
• Alkynes C
• Benzene D

Negatively charged particle nature of cathode rays was first demonstrated in 1895 by:

• Millikan. A
• J. Perrin. B
• Hittrof C
• J.J. Thomson. D

Which inorganic precipitate acts as semipermeable membrane?

• Calcium sulphate A
• Barium oxalate B
• Nickel phosphate C
• Copper ferrocyanide D

Polypeptide chains are coiled about one another into a spiral by:

• Ionic bonds A
• Covalent bonds B
• Van der Waal's forces C
• Hydrogen bonds D

Which of these reactions is shown by buranone, CH₃COCH₂CH₃

• On warming with acidified potassium dichromative (IV) the solution turns green A
• On heating with Fehling's reagent a red precipitate is formed B
• With 2,4-dinitrophenlhydrazine reagent an orange precipitate is formed C
• With hydrogen cyanide an aldehyde is formed D

Identify the heterocyclic compound

• Toluene A
• Pyridine B
• Butanoic acid C
• Propenol D

Sodium is never found free in nature because of its

• Chemical reactivity A
• Small ionic size B
• Small atomic volume C
• None of these D

A reaction in which an atom or a group of atoms replaces an atom or a group of atoms in the molecule of a substance is known as

• Addition reaction A
• Condensation reaction B
• Elimination reaction C
• Substitution reaction D

The atomic mass is measured in atomic mass unit (a.m.u.) which is equal to

• 1.661 x 10^{-27- Kg} A
• 1.661 x 10^-24Kg B
• 1.661 x 10^{-27- g} C
• 1.661 x 10^-24mg D

Which of the following consists of atoms and molecules and are held together by WAHDERWADD forces.

• H2O A
• CO2 B
• Cu C
• MgO D

Which element does not belong to 4d series

• Y A
• Zr B
• Mo C
• Zn D

Which of the following statement is correct.

• Formaldehyde is used in silvering of mirror A
• Propanol and propanone behave similarly in Tollen's seagent B
• Acetone on reduction gives primary alcohols C
• Ketones gives brick red color with Fehling's solution D

Hydrolysis of an ester gives a carboxylic acid which on Kolbe's electrolysis yields ethane. the easter is

• Ethyl methonoate A
• Methyl ethanoate B
• Propylamine C
• Ethylamine D

In a hydrogen-oxygen fuel cell, combustion of hydrogen occurs to

• Generate heat A
• Remove adsorbed oxygen from electrode surfaces B
• Produce High purity water C
• Create potential difference between two electrodes D

______ gives peroxide

• Li A
• Ba B
• Sr C
• Be D

The sample being analyzed is called:

• Electrolyte A
• Residue B
• Undue C
• Filtrate D

Which of the following is explosive?

• Trinitrophenol A
• Nitrophenol B
• Nitromethane C
• Nitrobenzene D

While balancing an equation by ion electron method, the number of oxygen atoms are balanced by

• OH^- A
• H₂O B
• O₂ C
• H⁺ D

Which electronic configuration corresponds to an element of Group ||Z-A of the periodic table?

• 1s, 2s², 2p⁶, 3s², 3p⁶, 4s² A
• 1s² , 2s² , 2p⁶ , 3s², 3p¹ B
• 1s², 2s², 2p⁶ C
• 1s², 2s², 2p⁶, 3s², 3p³ D

Odour of alkene is:

• Fruity A
• Odourless B
• Zarlic like C
• Irritating D

Volcanoes produce SO₂:

• 47% A
• 57% B
• 67% C
• 77% D

Which of the following statements is not correct regarding bonding molecular orbitals?

• Bonding molecular orbitals possess less energy than atomic orbitals from which they are formed A
• Bonding molecular orbitals have low electron density between the two nuclei B
• Every electron in the bonding molecular orbitals contributes to the attraction between atoms C
• Bonding molecular orbitals are formed when the electron waves undergo constructive interference D

Which of the following has ester linkage?

• Nylon A
• Bakelite B
• Terylene C
• PVC D

Potable water is considered to be

• Safe for human consumption A
• Not safe for human consumption B
• The surface water C
• The ground water D