ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

The volume occupied by 1.4 g of N₂ at S.T.P is

• 2.24 dm³ A
• 22.4 dm³ B
• 1.12 dm³ C
• 112 cm³ D

• With H₂/Ni CH₃(CH₂)₅CH₂OH A
• With H₂/Ni CH₃(CH₂)₅CH₃ B
• With NaBH₄ CH₃(CH₂)₅CH₂OH C
• With NaBH₄ CH₃(CH₂)₅CHO 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

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 synthetic fertilizer do not make soil acidic

• Urea A
• Thin urea B
• Ammonium phosphate C
• Potassium nitrate 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

Which of the statements given below concerning properties of solution, describe a colligative effect?

• Boiling point of pure water decreases by the addition of ethanol A
• Vapour pressure of pure water decreases by the addition of nitric acid B
• Vapour pressure of pure benzene decreases by the addition of naphthalene C
• Boiling point of pure benzene increases by the addition of toluene D

The degenerate orbitals p-sub shell are

• 2 A
• 3 B
• 5 C
• 7 D

The transitions element

• Are all metals A
• Are good conductor of heat B
• Show variable oxidation states C
• All of the above D

Hydrocarbans, SO₂, CO, NH₃, nitrogen oxides and compounds of fluorine are called

• Primary pollutant A
• Secondary pollutant B
• Tertiary pollutant C
• None of these D

Solution may have units

• Molarity A
• Molality B
• Mole fraction C
• All of them D

Alkyle magnesium halides are known as

• Simon-smith reagent A
• Tollen's reagent B
• Grignard's reagent C
• Barford's reagent 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

Without proper suction filtration is

• Rapid process. A
• Fague process. B
• Slow process. C
• Useless process. D

10g of NaOH has been dissolved per kg of solvent. The molality of solution is :

• .25 m A
• 1.5 m B
• .5 m C
• 2.5 m D

Non-formation of menisus by Hg in presence of O₃is due to the formation of

• Mercuric oxide A
• Mercurous oxide B
• Mercuric chloride C
• Mercurous chloride D

When aqueous NaCl is electrolyzed, which of the following ions get discharged at anode :

• H⁺

  A

• Na⁺

  B

• OH^-

  C

• Cl^-

  D

Which woody raw material is used for manufacture of paper pulp?

• Cotton A
• Bagasse B
• Popular C
• Rice straw D

Born-Haber cycle is an application of

• First of thermodynamics A
• Second law of thermodynamics B
• First law of thermodynamics C
• Hess's law D

denaturing of alcohol is done by adding methanol in ethanol:

• 10% A
• 20% B
• 30% C
• 40% D

Bohr model of atom is contradicted by:

• Planck's quantum theory A
• Pauli's exclusion theory B
• Heisenberg's uncertainty principle. C
• All of above. D

Which of the following is produced when an aqueous solution of butan-2-ol is refluxed with dil acidified KMnO₄

• Butanol A
• Butanoic acid B
• Butanone C
• Butane D

Solution which distill without change in composition or temperature are called

• Amorphous A
• Azeotropic mixture B
• Ideal C
• Super saturated D

Properties of metal are:

• Malleable and ductile A
• Form basic oxides B
• Tamish in air C
• All are true D

Ionization potential increases in moving from left to right in a period

• Because nuclear charge increase A
• Because atomic size decrease B
• Both (a) and (b) C
• Because atomic size increases D

The noble gas have

• Very low ionization energies A
• High boiling points B
• No electron pair interaction C
• No van Der Waal's forces D

5-d series is in the period :

• 4th A
• 5th B
• 6th C
• 7th D

Determination of atomic masses and invention of system of writing symbols was made by:

• J. Berzelius A
• Democritus B
• Dalton C
• None of above D

Radioactive element in halogens is

• Astatine A
• bromine B
• Iodine C
• Fluorine D

Commercial common salt becomes slight damp on storing because

• Common salt is hygroscope A
• Common salt contains some impurity, which is hygroscopic B
• Salt in efflorescent C
• Salt is crystalline D