ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

Smell of halogen is

• Fruity A
• Sweet B
• Irritating C
• Rotten egg D

Iron, once dipped in concentrated H₂SO₄, does not displace copper from copper sulphates solution, because

• It less reactive than copper A
• A layer of sulphates is deposited on it B
• An inert layer of iron oxide is deposited on it C
• All valence electrons of iron are consumed D

the unreactivity of alkanes is based upon

• Inertness of sigma bond A
• Non-polarity of the bonds B
• Both A and B C
• None of above D

Alkene general formula :

• C_nH_2n+2 A
• C_nH_2n B
• C_nH_2n-2 C
• C_nH_2n+1 D

Glucose in the presence of zymase is converted into

• Alcohol A
• Acid B
• Ethyl alcohol C
• Ketone D

UV radiations bring about

• Skin cancer A
• Mouth cancer B
• Lung cancer C
• Liver cancer D

Which of the following ions has more electrons than protons and more protons than neutrons.

• D- A
• D2O+ B
• He+ C
• OH- D

Iodine value of an oil or fat may be defined as

• The number of grams of iodine taken up by 1 g of the oil or fat A
• The number of grams of iodine taken by 10 g of the oil or fat B
• The number of grams of iodine taken by 100 g of the oil or fat C
• None of the above D

In 1000 molecules of 0.001 M acetic acid the number of H⁺ions is 12.6, then its percentage of ionization is

• 1.33% A
• 1.26% B
• 12.6 C
• 1% D

Which is the property of benzene?

• decolourizes KMnO₄ A
• straight chain structure B
• only double bond is present C
• triple and double bond D

A graph between P and 1/V at constant temperature and number moles of a gas meets the

• y-axis A
• x-axis B
• origin C
• none of above D

Silver mirror test is applied for

• Aldehydes A
• Alcohols B
• Acids C
• Esters D

H-bonding is not present in

• Glycerine A
• Water B
• Hydrogen sulphide C
• Hydrogen fluride D

The covalent bonds are

• Unidirectional A
• Bi-directional B
• Non-directional C
• Multi-directional D

• 
  A
• 
  B
• 
  C
• 
  D

Crystalline form of sulphur stable at room temperature is

• Rhombic sulphur A
• Monoclinic sulphur B
• Plastic sulphur C
• Prismatic sulphur D

Ethyl chloride on treatment with aqueous alkali gives

• Ethane A
• Ethene B
• Ethanal C
• Ethanol D

Which of the following phosphorus is most reactive?

• Red phosphorus A
• White phosphorus B
• Scrlet phosphorus C
• Violet phosphorous D

Which teat is not given by both glucose and fructose

• Give yellow ppt of CHl₃with alkaline aqueous iodine A
• With 2, 4-DNPH give yellow ppt of hydrazone B
• Evolve H₂gas with Na metal C
• Oxidised with [Ag(NH₃)₂]⁺i.e. Tollen's reagent D

The reaction between primary amine-chloroform and alcoholic caustic potash is called

• Wurtz reaction A
• Frankland reaction B
• Cannizzaro's reaction C
• Carbylamine reaction D

The gasoline having octane No. 100 has ______

• More knocking A
• Less knocking B
• No knocking C
• Only knocking D

There are 20α-amino acids found in protein 19 have -- NH₂as the amino group. Only one of theα-amino acids has a secondary amino group which one is this

• Glycine A
• Lysine B
• Proline C
• Cystein D

The experimental relationship between a reaction rate and the concentration of reactants is known as

• Order A
• Molecularity B
• Rate constant C
• Rate law D

For a given process, the heat change at constant pressure (p) and constant volume (v) are related to each other as

• 
  A
• 
  B
• 
  C
• 
  D

Reaction of Grignard's reagent eith aldehyds other formaldehyde gives: Reaction of Grignard's reagent with formaldehyde gives:

• Pri-alcohol A
• Sec-alcohol B
• Ter-alcohol C
• Carboxylic D

Which of the following statements is contrary to the first law of themodynamics

• Energy can neither be created nor destroyed A
• One form of energy can be transferred into an equivalent amount of other kinds of energy B
• In an adiabatic process, the work done is independent of its path C
• Continuous production of mechanical work without supplying and equivalent amount of heat is possible D

Group VI-B of transition elements contains:

• Zn, Cd, Hg A
• Fe ,Ru ,Os B
• Cr, Mo ,W C
• Mn, Te, Re D

Which one of the following is not a nuclelphile

• H₂O A
• H₂S B
• BF₃ C
• NH₃ D

When acetylene is passed through a copper tube at 300°C, it polymerizes to

• Polyacetylene A
• polyethylene B
• Benzene C
• None of these D

Aldehydes is distinguished from ketones by using

• Tollen's reagent A
• Benedict reagent B
• Fehling solution C
• All of the above D