ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

• Small change in concentration of product A
• Small time internal B
• Co-efficient of the reactant C
• Co-efficient of the product D

• Condensation A
• Dehydration B
• Dehydrogenation C
• Hydrogenation D

Drawback DDT as presticide is

• I becomes ineffective after some time A
• It is less effective than others B
• It is not easily/rapidly degraded in nature C
• Its high cost D

Given date

(i) heat of neutralization of HCl and NaOH is -57.3 KJ mole^-1

(ii) heat of neutralization of CH₃COOH with NaOH is 55.2 KJ mole^-1

The enthalpy of ionization of CH₃COOH is a determined according to Hess's law by

• Adding i and ii A
• Dividing i by ii B
• Subtracting i from ii C
• Subtracting ii from i D

The Electro-negatively difference for ionic bond must be greater than

• 1.6 A
• 1.7 B
• 1.8 C
• 1.0 D

• 
  A
• 
  B
• 
  C
• 
  D

The most suitable method of the separation of a mixture of ortho and para-nitrophenol mixed in the ratio of 1: 1 is

• Distrillation A
• Crystallization B
• Vapourisation C
• Colour spectrum D

Milk of lime is

• MgO A
• CaO B
• Ca(OH)₂ C
• Mg(OH)₂ D

Action of Zn with alkyl halides in the presence of an inert solvent forms higher alkanes. This reaction is known as

• Wurtz reaction A
• Frankland's reaction B
• Cannizaro reaction C
• Kalobe's reaction D

Allyl chloride on dehydrochlorination gives

• Propadiene A
• Propylene B
• Allyl alcohol C
• Acetone D

Chemical composition of colemnite is:

• Ca₂B₆O₁₁.5H₂O A
• CaB₄O₇ .4 H₂O B
• Na₂B₇O₇. 4 H₂O C
• CaNaB₅O₉.8H₂O D

An element that has a high ionization energy and tends to be chemically inactive would most likely to be:

• an alkali metal A
• a transition element B
• a noble gas C
• a halogen D

• Diastase A
• Lipase B
• Inverters C
• Zymase D

The value of SHE is cathode and anode is always taken to be

• One A
• Zero B
• Different C
• Same 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

Alpha rays consist of:

• Neutrons. A
• Helium nucleus. B
• Protons. C
• Hydrogen nucleus. D

The strongest forces are:

• Debye froces A
• London dispersion B
• Dipole-dipole attraction C
• Hydrogen bonding D

To differentiate isomers we use

• n- A
• iso- B
• neo C
• All of them D

The orbital in Rutherford's model is

• Spiral A
• Circular B
• Both C
• None D

Shielding effect intervening electrons causes

• Decreases in atomic radii in a period from right to left A
• Increase in atomic radii in a period from left to righ t B
• Decrease in atomic radii down the group C
• Increase in atomic radii down the group D

The detection of functional group is called :

• Numerical analysis. A
• Qualitative analysis. B
• Combustion analysis. C
• Quantitative analysis. D

Compounds X, Y and Z, all react with PCI₅to release hydrogen chloride, but only one of them reacts eith 2,4-dinitrophenylhydrazine reagent. Which one of the following combinations could be X, Y and Z

• 
  A
• 
  B
• 
  C
• 
  D

Amides on treatment with Br₂and KOH are converted into amines, the reaction is known as

• Hoffmann's bromamide reaction A
• Hoffmann's methylation B
• Gabriel phthalimide reaction C
• H.V.Z reaction D

Pure water does not conduct electricity because it

• Has low boiling point A
• Is almost unionized B
• Is neutral C
• Is readily decomposed D

The net heat change in chemical reaction is same whether it is brought in two or more different ways in one or several steps. it is known as

• Henry's law A
• Joule's principle B
• Hess's law C
• Law of conservation of energy D

______ gives peroxide

• Li A
• Ba B
• Sr C
• Be D

Which statement is not true. A solution is a homogeneous mixture of

• Two ionic substance like NaCl and HCl A
• Two molecular substances sugar and water B
• A solute and a solvent 1% NaHCO₃in water C
• NaCl and sand D

acidic soils are neutralized by adding

• plaster of paris A
• brine B
• lime C
• milk of magnesia D

The IUPAC name fo CH₃COCH (CH₃)₂is

• 4-Methylisopropyl ketone A
• 3-Methyl-2 butanone B
• Isopropylmethyl ketone C
• 2 - Methyl- 2 butanone D

The electronic configuration of an atom/ion can be defined by the following

• Aufbau principle A
• Pauli's exclusion principle B
• Hund's Rule C
• All the above D