ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

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  A
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  B
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  C
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  D

Which element among the following belongs to Group IV-A of the periodic table?

• Barium A
• Iodine B
• Lead C
• Oxygen D

Phosphine is not obtained by the reaction when

• White P is heated with NaOH A
• Red P is heated with NaOH B
• Ca₂P₂reacts with water C
• PH₄l is boiled with water D

Marble is chemically

• CaCl₂ A
• CaCO₃ B
• Na₂CO₃ C
• NaHCO₃ D

When electron jumps from n₂= 2,3,4,5,.... orbit to n₁= 1 orbit in the hydrogen atom, the radiations emitted give the spectral lines

• Lyman series A
• Blamer series B
• Paschen series C
• Brackett series D

Cyclohexane can be converted not benzene in the presence of

• Pt at 100°C A
• Pt at 250°C B
• Pd at room temperature C
• Pt at room temperature D

The number of elements in the 4th periods of periodic table is

• 8 A
• 10 B
• 18 C
• 32 D

Chile saltpetre has the chemical formula

• NaNO₃ A
• KNO₃ B
• Na₂B₄O₇ C
• Na₂CO₃H₂O D

Propyne on hydrolysis in presence of H₂SO₄and HgSO₄gives

• Acetaldehyde A
• Acetone B
• Formaldehyde C
• None D

Potassium chromate has formula

• KClO₃ A
• K₂CO₃ B
• K₂CrO₄ C
• K₂Cr₂O₇ D

Which three elements are needed for the healthy growth of plants?

• N,S,P A
• N,Ca, P B
• N,P,K C
• N,K,C D

Methanol and ethanol can be distinguished by

• Iodoform test A
• Iucas test B
• Dichromate/H₂SO₄oxidation test C
• Flame test D

Acetylene gives

• White ppt. with ammonical AgNO3 and red ppt. with ammonical Cu(NO3)2 A
• White ppt. with ammonical AgNO3 and red ppt. with ammonical Cu2C12 B
• White ppt. with both C
• Red ppt. with both D

Where lime is not used

• In refining or metals A
• In paper industry B
• In glass industry C
• In the preparation of NaOH D

A filtration process could be very time consuming if it were not aided by a gentle suction which is developed:

• If the paper covers the funnel up to its circumstances A
• If the paper has got small sized pores in B
• If the stem of funnel is large so that it dips in to filtrate C
• If the paper fits tightly. D

• Complete conversion of A to B has taken place A
• Conversion of A to B is only 50% complete B
• Only 10% conversion of A to B has taken place C
• The rate of transformation of A to B is just equal to rate of transformation of B to A in the system D

The study of heat changes accompanying a chemical reaction is known as :

• Thermochemistry. A
• Biochemistry. B
• Physical chemistry. C
• Analytical chemistry. D

Setting time of cement is controlled by adding:

• Epsom A
• Gypsom B
• CaCO₃ C
• CaCl₂ D

Which of the followings is not a nulceophile

• OH^- A
• NH₃ B
• C₂H₅O^- C
• Br₂ D

Vinyl acetylene combines with HCI to form

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

Which of the statement is contrary to the first law of thermodynamics

• Energy can neither be created nor destroyed A
• One form of energy can be transferred into an equivalent amount of other kinds of energy B
• In an adiabatic process the work done is independent of its path C
• Continuous production of mechanical work without supplying an equivalent amount of heat is possible D

Ethyl alcohol on oxidation with K₂Cr₂O₇gives

• Acetic acid A
• Acetaldehyde B
• Formaldehyde C
• Formic acid D

• Non polar R group A
• Polar R group B
• Acidic R group C
• Metallic R group D

When a colourless gas is passed through bromine water only decolourisation takes place the gas is

• SO₂ A
• HBR B
• HCl C
• H₂S D

Phosphorus helps the growth of

• Root A
• Leave B
• Stem C
• Seed D

Amino acids contain functional groups in it:

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

There are 20α-amino acids found in protein 19 have -- NH₂as the amino group. Only one of theα-amino acids has a secondary amino group which one is this

• Glycine A
• Lysine B
• Proline C
• Cystein D

Most common reactions of benzene and its derivatives are

• electrophilic addition reactions A
• electrophilic substitution reactions B
• Nucleophilic addition reactions C
• Nucleophilic subtitution reactions D

The nature of positive rays depend on:

• Nature of discharge tube. A
• Nature of resident gas. B
• Nature of electrode. C
• All of above. D

The electronegativity of elements in a period from left to right

• Decreases A
• Increases B
• First decreases then increases C
• First increases then decreases D