ECAT Chemistry Online Test

A chemical reaction A---------->B is said to be in equilibrium when :

• Rate of transformation of A to B is equal to B to A. A
• 50% reactant has been changed to B. B
• Conversion of A to B is 50% complete C
• Complete conversion of A to B has taken place. D

Which one of the following has discontinuous solubility curve

• CaCI₂6H₂O A
• NaCI B
• KCI C
• NaNO₃ D

In KO₂the oxidation state of oxygen is

• -2 A
• -1 B
• +1/2 C
• -1/2 D

How many isomeric disubtituted products are obtained by the introducing of second group in the ring

• Two A
• Three B
• Four C
• None D

The fibre which is made from vinylidine chloride polymer is called

• Rayon fibre A
• Azlon fibre B
• Acetate fibre C
• Saran fibre D

Vinyl acetylene combines with HCI to form

• Poly acetylene A
• Benzene B
• Chloroprene C
• Divinylacetylene D

The number of unpaired electrons in the p-subshell of oxygen atom

• 1 A
• 2 B
• 3 C
• 4 D

Subsidiary quantum number specifies

• size of orbital A
• shape of orbital B
• orientations of orbitals C
• Nuclear stability D

Maximum freezing point falls in

• Camphor A
• Naphthalene B
• Benzene C
• Water D

The bond angles in methane CH₄are equal to

• 109.5° A
• 107.5° B
• 104.5° C
• 120° D

Which of the following is an inert gas?

• H₂ A
• O₂ B
• N₂ C
• Argon D

Which element does not belong to 4d series

• Y A
• Zr B
• Mo C
• Zn D

All are ortho & Para directing except

• X A
• OH B
• NR₃ C
• NH₂ D

The heat of formation of graphite and P(white) is ______ KJ/mole

• 0.00 A
• -273.0 B
• +8.7 C
• 813.99 D

A white precipitate ofsilver chlorideimmediately formed on additionof :

• Silver nitrate solution to sodium chloride solution. A
• Silver chloride solution to sodium nitrate solution. B
• Silver nitrate solution to potassium chloride solution C
• Silver nitrate solution to hydrogen chloride solution. D

Nylon, 6,6 is a condensation polymer of

• Adipic acid and glycol A
• Phthalic acid and glycol B
• Adipic acid and hexaethylene diamine C
• Pthalic acid and hexaethylene diamine D

NaH is

• Ionic hydride A
• Complex hydride B
• Covalent hydride C
• Interstitial hydride D

Which of the following compounds will form a hydrocarbon on reaction with Grignard reagent

• A ketone A
• An aldehyde B
• An ether C
• Water D

Number of sigma bonds in P₄O₁₀is

• 6 A
• 7 B
• 17 C
• 16 D

CuSO₄. 5H₂O is used to prepare

• Transition complex A
• Fehling's 'A' sol B
• Fehling's 'B' sol C
• Fehling's sol D

The structure of benzene is

• Hexagonal A
• Pyramidal B
• Square planer C
• Tetrahedral D

Coal is obtained from dead remains of

• Plants A
• Animals B
• Both a and b C
• None D

• Hear of reaction A
• Heat of formation B
• Heat of neutralization C
• Heat of combustion D

CFCs undergo homolytic fission by uv light in the stratosphere which radical could result from this irradiations of CHCICF₂Cl.

• CHF Cl C FCl A
• CH Cl CF₂Cl B
• CHF CF₂Cl C
• C FCl CF₂Cl D

In lead accumulator the electrolyte is H₂SO₄solution is

• 30% H₂SO₄ A
• 60% H₂SO₄ B
• 80% H₂SO₄ C
• 90% H₂SO₄ D

Size of an anion is increased as compared to its atom because of the

• Addition of new shell A
• Repulsion of electrons in the valence shell B
• Decrease in nuclear charge C
• Increase in the unclear charge D

A solution containing 5.8 grams acetone (CH₃OCH₃), 4.6 gram ethyl alcohol (C₂H₅OH) and 12 grams chloroform (CHl₃) has mole fraction and mole percent of acetone

• 0.11, 10% A
• 0.33, 33% B
• 0.22, 22% C
• 0.11, 33% D

Ionization energy depends upon

• Nuclear charge A
• Atomic size B
• Shielding effect C
• All of the above D

The element with atomic number 55 belongs to which block of the periodic table

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

The empirical formula of a compound is CH₂O. What may be the compound

• C₂H₅OH A
• C₆H₅OH B
• HCOOH C
• 
  D