laboursonline – MCQs, Mock Tests | Chemistry Chemistry MCQ Question

Order of reaction of 2N2O5 ? 2N2O4+O2 is

1. First order
2. Second order
3. Third order
4. zero order

✅ Correct Answer: 1

For 3rd order reaction the hhalf life is inversely proportional to initial concentration of reactants

1. Single
2. Square
3. Cube
4. Raise to power four

✅ Correct Answer: 2

Which order of reaction obeys the relation t1/2 = 1/Ka

1. First order
2. Second order
3. Third order
4. Zero order

✅ Correct Answer: 2

Radiations are absorbed in

1. Spectrophotometer method
2. Dilatometric method
3. Optical relation method
4. Refractometric method

✅ Correct Answer: 1

Activated complex is formed due to

1. Pressure
2. Effective collision
3. Ineffective collisions
4. Temperature

✅ Correct Answer: 2

Energy of reactant higher than energy of product favours

1. Endothermic
2. Exothermic
3. Moderate reaction
4. No reaction

✅ Correct Answer: 2

Energy required to form transition state is called

1. Ea
2. P.E
3. V
4. K.E

✅ Correct Answer: 1

Which of the following will have very high rate of reaction?

1. Double decomposition reaction
2. Neutralization reaction
3. Ionic reactions
4. all of above

✅ Correct Answer: 4

Greater the conc. Of reactant

1. Greater will be dx/dt
2. Lesser will be dx/dt
3. dx/dt will be moderate
4. any of above

✅ Correct Answer: 1

Anything which increases rate of reaction without being involved in the reaction

1. Promoter
2. Catalyst
3. Inhibitor
4. All of the above

✅ Correct Answer: 2

The substances that reduces the effectiveness of a catalyst are called

1. Promoters
2. Poisoning catalysts
3. Inhibitors
4. pro-catalysts

✅ Correct Answer: 2

When catalysts and reactants are in more than one phase it is

1. Homogeneous catalysis
2. Heterogeneous catalysis
3. Catalysis
4. Ea

✅ Correct Answer: 2

Each catalyst has

1. Specificity
2. Special structure
3. Its own Ea
4. all of above

✅ Correct Answer: 4

Biocatalytical proteins are

1. Enzymes
2. Substrate
3. Lipids
4. any of above

✅ Correct Answer: 1

A catalyst can not effect

1. Products
2. Chemical equilibrium
3. Reactants
4. both a & b

✅ Correct Answer: 4

An enzyme has its specificity due to

1. Substrate
2. Structure
3. Temperature
4. Pressure

✅ Correct Answer: 2

Co-enzymes are

1. Non proteineous
2. Proteineous
3. sugars
4. lipids

✅ Correct Answer: 1

A substance which increases the reactivity of enzyme is called

1. Promoters
2. Inhibitors
3. Stimulators
4. Non-activators

✅ Correct Answer: 1

Addition of tetraethyl lead in petrol is example of

1. ve catalysis
2. ?ve catalysis
3. auto catalysis
4. anti catalysis

✅ Correct Answer: 2

When a product acts as catalyst then it is called

1. Autocatalsis
2. ?ve catalysis
3. ve catalysis
4. self catalysis

✅ Correct Answer: 1

End name of enzyme is

1. yl
2. ase
3. one
4. al

✅ Correct Answer: 2

When the reaction completes in more than one steps rate of reaction will be determined by

1. Fast step
2. Slowest step
3. All steps
4. Molecularity of the reaction

✅ Correct Answer: 2

For determining the order of reaction we use

1. Refractometric method
2. Dilatometric method
3. Optical activity method
4. Half life method

✅ Correct Answer: 4

Energy of activation for backward reaction is less than forward reaction for ________ reaction

1. Endothermic
2. Exothermic
3. Moderate
4. Fast

✅ Correct Answer: 1

The unit of slope in Arrhenius plot to calculate the energy of activation is

1. K-1
2. ?F
3. K
4. ?C

✅ Correct Answer: 3

Which statement is incorrect about catalyst

1. it is used in smaller amount
2. decrease activation energy
3. specific in action
4. it affects specific rate constant

✅ Correct Answer: 4

Which of the following type of reaction is 3rd order reaction

1. 2N2O5 = 2N2O4 + O3
2. NO + O3 ? NO2 + O2
3. 2FeCl3 + 6KI ? 2FeI2 + 6KCl + I2
4. None of these

✅ Correct Answer: 3

Boron is non-netal whereas A1 is metal. It is due to

1. Small size
2. High nuclear charge
3. Both a and b
4. No authorized justification yet

✅ Correct Answer: 3

Boron in soil has been considered micronutrient for

1. Soil porocity
2. Proper growth of plants
3. Alkalinity of soil
4. All

✅ Correct Answer: 2

One of the outstanding features of boron is its ability to form

1. Molecular addition compounds
2. Molecular crystals
3. Semiconductors
4. Ionic compounds

✅ Correct Answer: 1

Substance which is found in dried up lakes of Tibet and California is

1. Tincal
2. Boric acid
3. Calcium carbonate
4. Colemanite

✅ Correct Answer: 1

Borax is a white crystalline solid and it is

1. More soluble in cold water
2. More soluble in hot water
3. Insoluble in water
4. Soluble only in organic solvents

✅ Correct Answer: 2

Which of the following does not give Borax bead test?

1. Cu
2. Cr
3. Ni
4. A1

✅ Correct Answer: 4

Special features of borate glass is that it is

1. Heat resistant
2. Low melting
3. Used to prepare chemical garden
4. Green in colour

✅ Correct Answer: 1

The metal which is used in thermite process because of its activity is

1. iron
2. copper
3. aluminium
4. zinc

✅ Correct Answer: 3

Aluminium oxide is

1. Acidic oxide
2. Basic oxide
3. Amphoteric oxide
4. It does not exists

✅ Correct Answer: 3

Which of the following shows inert pair effect?

1. boron
2. carbon
3. silicon
4. tin

✅ Correct Answer: 4

Which electronic configuration corresponds to an element of group IIIA?

1. 1s2 2s2 2p3
2. 1s2 2s2 2p6 3s2 3p1
3. 1s2 2s2 2p4
4. 1s2 2s2 2p6 3s2 3p6 4s2 3d1

✅ Correct Answer: 2

Tincal is a mineral of

1. A1
2. Si
3. B
4. C

✅ Correct Answer: 3

In network of silica (SiO2) each silicon atom is surrounded by _________ atoms of osygen

1. 4
2. 2
3. 1
4. 6

✅ Correct Answer: 1

Which one of the following is not a semiconductor?

1. Si
2. Ge
3. Se
4. Sn

✅ Correct Answer: 4

Orthoboric acid is 2.6% soluble in water at 40?C and ________at 107?C.

1. 26%
2. 27%
3. 37%
4. <2.6%

✅ Correct Answer: 3

The process of aluminium extraction is called

1. Hall process
2. Thermite process
3. Haber process
4. Contact process

✅ Correct Answer: 1

Because of its ability to combine with both oxygen and nitrogen aluminium metal is used

1. As nitrometer
2. To remove air bubbles from molten metal
3. To produce alloy
4. As insulator

✅ Correct Answer: 2

Aqueous solution of borax above 62?C gives crystals of

1. Na2B4O7.4H2O
2. Na2B4O7.5H2O
3. Na2B4O7.2H2O
4. Na2B4O7.10H2O

✅ Correct Answer: 2

Silicon differ from silica by a group of

1. Ch3
2. ?OH
3. OCH3
4. O2

✅ Correct Answer: 1

Which of the following is not a use of silicon?

1. Lubricants
2. Hydraulic brakes
3. Antifreeze
4. Water repellent

✅ Correct Answer: 3

Boron is non metal while other elements of IIIA group are metals. This is because

1. it has small size
2. it has high nuclear charge
3. it forms molecular addition compounds
4. all of the above

✅ Correct Answer: 4

CO2 is gas while SiO2 is solid at room temperature.

1. carbon is non-metal while silicon is semi-metal
2. CO2 is an independent molecule while SiO2 has network covalent structure
3. CO2 forms multiple bond while silicon does not form multiple bonds
4. Silicon has all sigma bonds

✅ Correct Answer: 2

The coloured glassy mass in borax bead test is due to the formation of

1. metal borate
2. metal meta borate
3. metal boride
4. metal silicate

✅ Correct Answer: 2

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