ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

Some of the elements of a period show similar behavior with the elements of next group in next period this is called

• Vertical relationship A
• Oblique relationship B
• Diagonal relationship C
• None D

Electrons arranged in orbitals according to the increasing order of their n + l values, this rule is named as

• Hund's rule A
• Heisenberg's principle B
• Paulit exclusion principle C
• Auf bau principle D

After chlorination, the pulp is washed at

• 20°C A
• 30°C B
• 40°C C
• 60°C D

• Neutrons are attracted by nucleus A
• Neutrons carry out nuclear reactions B
• Neutrons carry no charge C
• Neutrons are electromagnetic radiations D

Ionic Solids are characterized by

• Low melting points A
• Good conductivity in solid state B
• High vapour pressure C
• Solubility in polar solvents D

Amino acids contain functional groups in it:

• --CO-- A
• --OH B
• ---NH₂ C
• All of these D

Which statement about an atom is true ?

• The number of neutrons is not equal to number of electrons A
• Mass number is less than atomic number B
• All the elements have only one mass number C
• Mass number can be equal to atomic number D

The rate of reaction determined at a given time is called

• Average rate A
• Instantaneous rate B
• Specific rate C
• Overall rate D

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

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

Hybridized in carbon is:

• sp A
• sp² B
• sp³ C
• d²sp D

Orthophosphoric acid is

• Monobasic A
• Dibasic B
• Tribasic C
• Tetrabasic D

Which of the following compound is known as oil of winter green?

• Phenyl benzoate A
• Phenyl salicylate B
• Phenyl acetate C
• Methyl salicylate D

The bond length b/w atoms of hydrogen in the hydrogen molecules is:

• 7.54 nm. A
• 0.0754 nm. B
• 0.754 nm. C
• 0.00754 nm. D

Specific gravity of HNO₃ is

• 1.35 A
• 1.53 B
• 1.39 C
• 1.93 D

In which reaction, aromatic aldehyde is treated with acid anhydride in the presence of corresponding salt of the acid to give unsaturated aromatic acid?

• Friedel-Crafts reaction A
• Perkin's reaction B
• Wurtz reaction C
• None of these D

The homologous series of aldehydes and ketones have general formula:

• C_nH_2nO A
• C_nH_nO B
• C_nH_2n-1O C
• C_nH_nO_n D

Electron affinity value from higher to heavier element:

• Increase A
• Decreases B
• remains same C
• Not effect D

Which is the formula of tetra-ammine chloronitro platinum (VI) sulphate?

• [Pt(NH₃)₄(NO₂)]SO₄ A
• [PtNO₂Cl(NH₃)₄]SO₄ B
• [PtCl(NO₂)(NH₃)₄]SO₄ C
• [Pt(NH₃)₄(NO₂)Cl]SO₄ D

The electrophile in aromatic sulphonation is

• H₂SO₄ A
• HSO₄ B
• SO₃ C
• SO₃⁺ D

Cotton is an example of

• Animal fibre A
• Mineral fibre B
• Vegetable fibre C
• Synthetic fibre D

A pseudo uni-molecular reaction has order of reaction :

• 3 A
• 2 B
• 1 C
• 0 D

Formula of chloroform is

• CH₃CI A
• CCI₄ B
• CH₂CI₂ C
• CHCI₃ D

Ozone hole refers to

• Hole in ozone layers A
• Reduction in thickness of ozone layer in stratosphere B
• Reduction of thickness of ozone in troposphere C
• Increase concentration of ozone D

The tendency of atoms to attain a maximum of eight electrons in the valence shell is known as:

• Duplet rule. A
• Triad rule. B
• Octet rule. C
• Tetrade rule. D

Law of triads was given by:

• Al-Razi A
• Dobriener B
• Newland C
• Mendeleev 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

Gases exert pressure on walls of container because the gas molecules :

• Obey gas laws. A
• Have definite volume. B
• Collide with the walls of container. C
• Collide with each other. D

The optimum conditions of temperature and pressure to get maximum NH₃form N₂and H₂gases is

• 2000°C and 10 atmosphere A
• 0°C and 1 atmosphere B
• 400°C and 200-300 atmosphere C
• 200°C and 100 atmosphere D

The C-C bond angles in benzene ring are

• 119° A
• 120° B
• 121° C
• None D

Aldelydes are the oxidation product of

• P-alcohols A
• s-alcohols B
• ter-alcohols C
• carboxylic acids D