ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

The malt-sugar in the presence of yeast or invertase gives

• Fructose A
• Glucose B
• Lignin C
• Alcohol D

German silver does not contain

• Cu A
• Zn B
• Ni C
• Mn D

If absolute temperature of a gas is doubled and the pressure is reduced to one half, the volume of gas will :

• remain unchanged A
• increase four times B
• reduce to 1/4 C
• be doubled D

Carboxyl compounds have functional group:

• R-C-X A
• R-CH=O B
• RCOR C
• All D

• -1.10 V A
• +1.10 V B
• -0.42 V C
• +0.42 V D

Which of the following is not aromatic hydrogencarbon

• Benzene A
• Naphthalene B
• Toluene C
• Cyclohexene D

Wholer prepared urea from

• Ammonia A
• NH₄CNO B
• NH₃ C
• Uric acid D

Mass spectrometer measures the

• Exact mass of an element A
• Average mass of an element B
• The number of elements present in a molecule C
• m/e value of a positive ion D

• 2-chlorobutanal A
• alfa-chlorobutanal B
• 2-chlorobutyraldehyde C
• alfa- chlorobutyraldehyde D

Which orbital is in the process of completion in case of transition elements

• p-orbital A
• f-orbital B
• d-orbital C
• s-orbital D

1-Chlorobutane on reaction with alcoholic potash gives

• But 1-ene A
• Butan-1-ol B
• But-2-ene C
• Butan-2-ol D

Which responds to +ve iodoform test?

• Butanol-1 A
• Butan-1-al B
• Butanol-2 C
• 2-pentanone D

K,Ca and Li metals may be arranged in decreasing order of their reduction potential as :

• Li, k, Ca A
• Ca, K, Li B
• Li, Ca, K C
• K, Ca, Li D

Covalent compounds are soluble in

• Polar solvents A
• Non-polar solvents B
• Concentrated acids C
• All solvents D

A polymeric substance that is formed in the liquid state and then hardened to a rigid solid is called a

• Fibre A
• Plastic B
• Varnish C
• Polyamide resin D

Reaction of ethanes with KMnO₄ gives:

• Ozonide A
• Glyoxal B
• Glycol C
• Oxalic acid D

If 18 g glucose (C₆H₁₂C₆) is present in 1000 g of an aqueous of glucose it is said to be

• 1 molal A
• 1.1 molal B
• 0.5 molal C
• 0.1 molal D

To determine the rate of reaction chemically a graphical method is applied. A graph is plotted between the amount or reactant decomposed or product formed against the time. The rate d_x/d_tat any time is equal to

• k A
• Tangentθ B
• 1/a, a is initial conc. C
• 1/a² D

Pakistan at the time of existence in 1947 was a country:

• agrarian A
• industrial B
• nuclear C
• economically strong D

Quantum number value for 2p orbitals are:

• n=2 ,l=1 A
• n=1 ,l=2 B
• n= ,l=0 C
• n=2 ,l=0 D

Which class of compound is more reactive

• Alkane A
• Alkene B
• Alkyne C
• None D

Which compound is more soluble in water?

• C₂H₅OH A
• C₅H₅OH B
• CH₃OCH₃ C
• n-Hexanol D

Which shows maximum catenation property?

• S A
• Se B
• Te C
• O D

Chloroform is carcinogenic:

• Heart A
• Lungs B
• Liver C
• Kidney D

How is the secondary structure of protein stabilized

• Through hydrogen bonding A
• Through ionic bonding B
• Through van der wall forces C
• Through covalent bonding 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

Polythene is a polymer of

• Ethane A
• Ethene B
• Acetone C
• Propylene D

• Measuring pH A
• Measuring density B
• Titration against standard NaOH C
• Titration against standard KMnO₄solution D

Peroxyacetylnitrate (PAN) is an irritant to human beings and it affects:

• Eyes A
• Ears B
• Stomach C
• Nose D

What is the volume in cm³of 3.01 x 10²³molecules of O₂gas at S.T.P

• 1000 cm³ A
• 11000 cm³ B
• 1120 cm³ C
• 11200 cm³ D