ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

Orbital having same energy is called:

• Hybrid orbital. A
• Valence orbital. B
• Degenerate orbital. C
• D-orbital. D

The bond order of individual C - C bond is benzene is

• One A
• Two B
• Between one and two C
• One and two alternately D

Ketones are reduced to

• Primary alcohol A
• Secondary alcohol B
• Tertiary alcohol C
• All of these D

The order of reactivity for a given halogen in Grignard's reagent is:

• CH₃X > C₂H₅X > C₃H₄X > C₄H₄X A
• C₂H₅X > C₃H₇X > C₄H₅X > CH₄X B
• C₃H₇X > C₄H₇X > CH₃X > C₂H₅X C
• C₄H₄X > C₃H₇X > C₂H₅X > CH₄X D

Cyclone collector is used for minimizing

• Radioactive pollution A
• Air pollution B
• Noise pollution C
• Water pollution D

Bleaching powder may be produced by passing chlorine over

• Calcium carbonate A
• Hydrated calcium sulphate B
• Anhydrous calcium sulphate C
• Calcium hydroxide D

CuSO₄. 5H₂O is used to prepare

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

Alkynes normally have ______ hybridization

• Sp A
• Sp² B
• SP³ C
• d sp³ D

The state of equilibrium refers to

• State of rest A
• Dynamic state B
• Stationary state C
• State of inertness D

The total values of magnetic quantum number of subshell are five, the subshell is

• S-subshell A
• P-subshell B
• D-subshell C
• F-subshell D

The value of K_pis greater than K_cfor a gaseous reaction when

• Number of molecules of products is greater than the reactants A
• Number of molecules of reactants is greater than those of products B
• Number of molecules of reactants and products equal C
• Catalyst is added D

The colour of ppts formed by Fehling's test is

• Brick red A
• Red B
• Yellow C
• Orange D

Preparation of vegetable ghee involves:

• Halogenation A
• Hydrogenation B
• Hydroxylation C
• Dehydrogenation D

Dehydration of glycerol give

• Propane A
• Propene B
• Acrolein C
• Benzene 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

• There is no change in temperature A
• No change in volume B
• Heat is absorbed C
• Heat is released D

Lime is often used as an agent:

• dehydrating A
• hydrating B
• oxidizing C
• reducing D

The shape of CIO^-₃according to valence shell electron pair repulsion theory will be

• Planar triangle A
• Pyramidal B
• Tetrahedral C
• Square planar D

Molecular orbital picture of N₂ indicates

• One unpaired electron A
• Two unpaired electron B
• No unpaired electron C
• None of these D

Complete combustion of alkane yields

• CO₂+ H₂O A
• CO₂+ heat B
• CO + H₂O heat C
• CO₂+ H₂O + heat D

The tip of the funnel should touch the side of the beaker in order to avoid

• Splashing A
• Leakage B
• Mixing C
• Contamination D

Which of the following isoelectronic ions has the lowest ionization energy?

• K⁺ A
• Ca²⁺ B
• Cl^- C
• S^2- D

Which of the following favours the reverse reaction in chemical equilibrium?

• Increasing the concentration of the reactant A
• Removal of the least one of the products at regular intervals B
• Increasing the concentration of one or more of the products C
• None of these D

Corrundam is ore of:

• Li A
• Be B
• B C
• Al D

A molecular ion is formed by

• Passing a high energy electron beam through gaseous molecule A
• Dissolving a salt i dilute acid B
• Passing electric current through molten salt C
• Passing electricity through aqueous solutions D

A graph between P and 1/V at constant temperature and number moles of a gas meets the

• y-axis A
• x-axis B
• origin C
• none of above D

Planar geometry of molecules is due to

• sp³hybridization A
• sp²hybridization B
• sp hybridization C
• P - p overlap D

Phenols are derivative of:

• Alkanes A
• Alkenes B
• Alkynes C
• Benzene D

The structure of ICI₂is

• Trigonal A
• Trigonal bipyramidal B
• Octahedral C
• Square planar D

In endothermic reactions, the heat contents of the:

• Products equal to the reactants. A
• Reactants more than that of products. B
• Products more than that of reactants C
• Both (b) and (c) D