ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

In OF₂, number of bond pairs and Ione paris of electrons are respectively

• 2,6 A
• 2,8 B
• 2,10 C
• 2,9 D

96500 C of electricity liberates from CuSO₄solution

• 63.5 g of Cu A
• 31.75 g of Cu B
• 96500 g of Cu C
• 100 g of Cu D

Compounds having same molecular formula but different structures are said to be

• Monomers A
• Isomers B
• Metamers C
• Tautomers D

Which metal is used in the thermit process because of its activity?

• Iron A
• Copper B
• Alumnium C
• Zinc D

Freezing point depression is measured by

• Beckmann's apparatus A
• Lands Berger's method B
• Antifreeze apparatus C
• All of the above D

• Br_2(aq) A
• 2, 4-dinitrophenylhydrazine B
• NaBH C
• Tollen's reagent D

• 3 A
• 4 B
• 5 C
• 2 D

Which has soapy touch?

• Na2B4O7 A
• H3BO3 B
• Ca2B6O11 C
• HBO2 D

Energy of electron in the infinite Bohr orbit of H-atom is

• 0 KJ/mole A
• 1 KJ/mole B
• -1 KJ/mole C
• -1313.32 KJ/mole D

Electronegativity order of alkyl halides is:

• Rl > RBr > RCl > RF A
• Rbr > RCl > RF >Rl B
• RCl > RF >Rl > RBr C
• RF >Ri > RBr >RII D

On warming with silver powder,chloroform is converted into

• Acetylene A
• Hexachloroethane B
• 1,1,2,2-tetrachloroethane C
• ethylene D

• Zn A
• H B
• S C
• O D

The characteristic reactions of alkanes are

• Addition reactions A
• Substitution reactions B
• Condensation reactions C
• Polymerization reactions D

Cannizzaro's reaction in not given by

• Formaldehyde A
• Acetaldehyde B
• Benzaldyhyde C
• Trimethylacetaldehyde D

The cement plants in west Pakistan at the time of creation were

• ten A
• twenty two B
• four C
• twenty four D

Which is an inert gas?

• Nitrogen A
• Oxygen B
• Hydrogen C
• CO D

In a experiment 0.10 of gas found to occupy 83.1 cm3 Measured at standard pressure (1.0 x 105 pa) and 26 degree. The relative molecular mass is.

• (0.10)(8.31)(27)/(1.0x10³)(83.3x10^-3) A
• (0.10)(8.31)(300)/(1.0x10³)(83.3x10^-6) B
• (0.10)(8.31)(27)/(1.0x10³)(83.3) C
• (0.10)(8.31)(300)/(1.0x10³)(83.3) D

Gradation in properties in the periods of periodic tables are due to change in

• Atomic weight A
• The number of electrons B
• Number of protons C
• Electronic configuration D

Which of the following is a natural polymer?

• Terylene A
• Polysaccharide B
• Nylon C
• Polyethene D

2SO₂+ O₂⇌2SO₂H= 188KJ mole^-1

Which statement about following equilibrium is correct :

• The value ofK_pfalls with arise in temperature.

  A

• The value ofK_pis equal tok_c.

  B

• The value ofK_pfalls with the increase pressure.

  C

• Adding V₂O₅catalyst increase the equilibrium yield of Sulphur trioxide.

  D

Which of the following aqueous solutions have the lowest freezing point

• 5.85% NaCI A
• 6% urea B
• 34.2 sucrose C
• All of them have same freezing points D

Which of the following molecules has a net dipole moments

• CO₂ A
• CS₂ B
• SO₂ C
• CCI₄ D

Reaction of Grignard's reagent with ketones gives: Reaction of Grignard's reagent with formaldehyde gives:

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

A double bond consists of:

• Two sigma bonds A
• One sigma and one pi bonds B
• One sigma and two pi bonds C
• Two pi bonds D

Which of the following liquids has low vapor pressure at 25°C:

• Diethyl ether A
• Acetone. B
• Water. C
• Ethyl alcohol. D

Which of the following is an inert gas?

• H₂ A
• O₂ B
• N₂ C
• Argon D

The total number of rare earth elements is

• 8 A
• 32 B
• 14 C
• 10 D

Which of the following nitrogen fertilizer contains more nitrogen

• NaNO₃ A
• KNO₃ B
• NH₄NO₃ C
• Urea D

Carboxylic acid, ester, amide and amino groups are shown. Which is the correct description of these functional groups

• 
  A
• 
  B
• 
  C
• 
  D

It is noticed that energy in the from of heat is either evolved or absorbed as a result of a:

• Physical change. A
• Chemical change. B
• Biological change. C
• All of above. D