Chemistry Mcqs Test Preparation for ECAT & MCAT - Set 20

1)   Ozonolysis of benzene produces

a. Glycol
b. Glycol
c. Vicinal diol
d. Both b & c
Answer  Explanation 

ANSWER: Glycol

Explanation:
No explanation is available for this question!


2)   What is the molecular formula of Benzenetriozonide?

a. C6H6O9
b. C6H5O8
c. C6H5O9
d. C6H6O6
Answer  Explanation 

ANSWER: C6H6O9

Explanation:
No explanation is available for this question!


3)   The hydrolysis of Benzenetrizonide will yield three moles of

a. Glyoxime
b. Benzaldehyde
c. Glycol
d. Glyoxal
Answer  Explanation 

ANSWER: Glyoxal

Explanation:
No explanation is available for this question!


4)   Which of the following substance produce acetaldehyde on dry distillation?

a. (CH3COO)2Ca
b. (HCOO)2Ca
c. both (a) and (b)
d. none
Answer  Explanation 

ANSWER: both (a) and (b)

Explanation:
No explanation is available for this question!


5)   Which of the following will have the highest boiling point?

a. methanal
b. ethanal
c. propanal
d. hexanone
Answer  Explanation 

ANSWER: hexanone

Explanation:
No explanation is available for this question!


6)   Which of the following reaction is not shown by ketones?

a. reaction with HCN
b. reaction with NaHSO3
c. reaction with 2 4 dinitrophenyl hydrazine
d. reaction with Fehling solution
Answer  Explanation 

ANSWER: reaction with Fehling solution

Explanation:
No explanation is available for this question!


7)   The carbon atom of carbonyl group is

a. sp hybridized
b. sp2 hybridized
c. cp3 hybridized
d. dsp2 hybridized
Answer  Explanation 

ANSWER: sp2 hybridized

Explanation:
No explanation is available for this question!


8)   Which of the following substances does not give iodoform test?

a. acetaldehyde
b. ethyl alcohol
c. methyl alcohol
d. acetone
Answer  Explanation 

ANSWER: methyl alcohol

Explanation:
No explanation is available for this question!


9)   Formalin is _______ % solution of formaldehyde in water

a. 10%
b. 20%
c. 40%
d. 60%
Answer  Explanation 

ANSWER: 40%

Explanation:
No explanation is available for this question!


10)   Which of the following aldehydes shows rapid reaction with sodium nitroprusside?

a. formaldehyde
b. accetaldehyde
c. benzaldehyde
d. acetone
Answer  Explanation 

ANSWER: acetone

Explanation:
No explanation is available for this question!


11)   Acetone reacts with HCN to form a cyanohydrin. It is an example of

a. electronphilic addition
b. electrophilic substitution
c. nucleophilic addition
d. nucleophilic substitution
Answer  Explanation 

ANSWER: nucleophilic addition

Explanation:
No explanation is available for this question!


12)   Which of the following compounds will react with Tollens reagent?

a. CH3-CHO
b. CH3-CH-CH3
c. CH3-COOH
d. CH3-CO-CH2-CH3
Answer  Explanation 

ANSWER: CH3-CHO

Explanation:
No explanation is available for this question!


13)   Which of the following reactions may be assoclated with aldehyde and ketone?

a. nucleophile addition
b. polymerization
c. oxidation
d. all of the above
Answer  Explanation 

ANSWER: all of the above

Explanation:
No explanation is available for this question!


14)   Cannizzaros reaction is not given by

a. formaldehyde
b. acetaldehyde
c. benzaldehyde
d. trimethyl acetaldehyde
Answer  Explanation 

ANSWER: acetaldehyde

Explanation:
No explanation is available for this question!


15)   Which of the following reagents will react with both aldehydes and ketones?

a. Grignard reagent
b. Tollens reagent
c. Fehlings reagent
d. Benedicts reagent
Answer  Explanation 

ANSWER: Grignard reagent

Explanation:
No explanation is available for this question!


16)   Ketones are comparatively less reactive than aldehdye. It is due to

a. alkyl groups are electron donating
b. steric hindrance
c. both (a) and (b)
d. none
Answer  Explanation 

ANSWER: both (a) and (b)

Explanation:
No explanation is available for this question!


17)   Which of the following do not give aldol condensation reactions?

a. formaldehyde
b. acetaldehyde
c. diemthyl ketone
d. propionaldehyde
Answer  Explanation 

ANSWER: formaldehyde

Explanation:
No explanation is available for this question!


18)   Which of the following is not a use of formaldehyde?

a. in silvery mirror
b. in making medicine urotropine
c. in making throat lozenges
d. in making acetic acid
Answer  Explanation 

ANSWER: in making acetic acid

Explanation:
No explanation is available for this question!


19)   Formaldehyde and lactose are combined to produce throat lozenges named as

a. formamint
b. lactomint
c. aldomint
d. formalactose
Answer  Explanation 

ANSWER: formamint

Explanation:
No explanation is available for this question!


20)   Which of the following is not a use of acetaldehyde?

a. formation of phenolic resins
b. formation of mirror
c. antiseptic inhalant
d. formation of throat lozenges
Answer  Explanation 

ANSWER: formation of throat lozenges

Explanation:
No explanation is available for this question!


21)   Formula of haloform is

a. HCOX
b. CX4
c. CHX3
d. CH3X
Answer  Explanation 

ANSWER: CHX3

Explanation:
No explanation is available for this question!


22)   Formaldehyde condenses with phenol in the presence of dilute H2SO4 to yield

a. Nylon 66
b. urotropine
c. Aniline formaldehyde plastic
d. Bakelite
Answer  Explanation 

ANSWER: Bakelite

Explanation:
No explanation is available for this question!


23)   Formalin consists of mixture of formaldehyde methyl alcohol and water. Percentage of water in it is

a. 60%
b. 50%
c. 52%
d. 8%
Answer  Explanation 

ANSWER: 52%

Explanation:
No explanation is available for this question!


24)   Which of the following will not give addition reaction with NaHSO3

a. HCHO
b. CH3CHO
c. CH3-CH2-CHO
d. None of the above
Answer  Explanation 

ANSWER: CH3-CH2-CHO

Explanation:
No explanation is available for this question!


25)   Which of the following compounds has the empirical formula CH2O and reacts with sodium hydroxide?

a. carbonic acid
b. ethanol
c. acetic acid
d. methanoic acid
Answer  Explanation 

ANSWER: acetic acid

Explanation:
No explanation is available for this question!


26)   Aldehyde and ketone have same general formula for homologous series

a. CnH2nO2n
b. CnH2n
c. CnH2nO
d. CnH2nOn+1
Answer  Explanation 

ANSWER: CnH2nO

Explanation:
No explanation is available for this question!


27)   Oxidation of primary alcohol gives

a. ketone
b. Aldehyde
c. Alkene then - COOH
d. Ester
Answer  Explanation 

ANSWER: Aldehyde

Explanation:
No explanation is available for this question!


28)   Ethanal is prepared industrially by air oxidation of ethylene using palladium chloride as catalyst and _____ as promoter

a. PdCl2
b. Cu2Cl2
c. CuCl2
d. PbCl2
Answer  Explanation 

ANSWER: CuCl2

Explanation:
No explanation is available for this question!


29)   Ncleophilic addition reactions are catalysed

a. Acid
b. Base
c. Both a and b
d. None
Answer  Explanation 

ANSWER: Both a and b

Explanation:
No explanation is available for this question!


30)   Acetaldehyele cyanohydrin on acid hydrolysis yields

a. Tartaric acid
b. Propanoic acid
c. Lactic acid
d. Valeric acid
Answer  Explanation 

ANSWER: Lactic acid

Explanation:
No explanation is available for this question!


31)   Acetal on acid hydrolysis generates

a. Alcohol
b. Ketone
c. Both a & b
d. None of the above
Answer  Explanation 

ANSWER: Both a & b

Explanation:
No explanation is available for this question!


32)   Which one exhibits aldol condensation

a. HCHO
b. C6H5CHO
c. Cl3CCHO
d. CH3COCH3
Answer  Explanation 

ANSWER: CH3COCH3

Explanation:
No explanation is available for this question!


33)   Tetrahydroborate ion is the source of

a. proton
b. H+
c. both a & b
d. H-
Answer  Explanation 

ANSWER: H-

Explanation:
No explanation is available for this question!


34)   Which of the following is a symmetrical ketone

a. 3 - hexanone
b. acetone
c. butanone
d. 2-pentanone
Answer  Explanation 

ANSWER: acetone

Explanation:
No explanation is available for this question!


35)   Dry distillation of calcium acetate results in the formation of

a. formaldehyde
b. acetaldehyde
c. methane
d. acetone
Answer  Explanation 

ANSWER: acetone

Explanation:
No explanation is available for this question!


36)   In base catalyzed reaction of carbonyl compound the catalyst

a. increases the nucleophilic character of reagent
b. increases electrophilic character of carbonyl compound
c. acidic character of reagent
d. both a and b
Answer  Explanation 

ANSWER: increases the nucleophilic character of reagent

Explanation:
No explanation is available for this question!


37)   Cannizaros reaction takes place through the transfer of _______ from complex anion.

a. hydrogen ion
b. hydride ion
c. oxide ion
d. methoxide ion
Answer  Explanation 

ANSWER: hydride ion

Explanation:
No explanation is available for this question!


38)   Iodoform test can be used to distinguish between

a. ethanol and methanol
b. acetaldehyde and methanal
c. acetone and diethyl ketone
d. all of the above
Answer  Explanation 

ANSWER: all of the above

Explanation:
No explanation is available for this question!


39)   The fertility of the soil is improved by

a. Rotation of the crops
b. Adding lime to the acid salts
c. Adding manure and growing legumes
d. All
Answer  Explanation 

ANSWER: All

Explanation:
No explanation is available for this question!


40)   Which of the following is incorrect statement about nitrogen importance?

a. It enhances plant growth
b. It is involved in the synthesis of protein and nucleic acids
c. it accelerates fruits and flowers growth
d. It is involved in the chlorophyll synthesis
Answer  Explanation 

ANSWER: it accelerates fruits and flowers growth

Explanation:
No explanation is available for this question!


41)   The fertilizers which provide single nutrient from NPK are called ______ fertilizer.

a. straight
b. compound
c. both a and b
d. none of the above
Answer  Explanation 

ANSWER: straight

Explanation:
No explanation is available for this question!


42)   Which of the following is macronutrient?

a. Cu
b. Cl
c. H
d. Zn
Answer  Explanation 

ANSWER: H

Explanation:
No explanation is available for this question!


43)   Addition of urea to the soil is _________ reaction.

a. endothermic
b. exothermic
c. both a and b
d. no heat energy is involved
Answer  Explanation 

ANSWER: exothermic

Explanation:
No explanation is available for this question!


44)   Which of the following is the most suitable catalyst for ammonia synthesis?

a. Pt
b. ZnO + Cr2O3
c. Fe in fused mixture of Al2O3 + SiQ2 + MgO
d. All of the above
Answer  Explanation 

ANSWER: Fe in fused mixture of Al2O3 + SiQ2 + MgO

Explanation:
No explanation is available for this question!


45)   The cooling of molten urea by air in the tower is called

a. prilling
b. evaporation
c. condensation
d. crystallization
Answer  Explanation 

ANSWER: prilling

Explanation:
No explanation is available for this question!


46)   Which of the following fertilizers is not useful for paddy rice?

a. urea
b. DAP
c. Ammonium sulphate
d. Ammonium nitrate
Answer  Explanation 

ANSWER: Ammonium nitrate

Explanation:
No explanation is available for this question!


47)   DAP (Diammonium hydrogen phosphate) contains _________ plant nutrients.

a. 60%
b. 65%
c. 70%
d. 75%
Answer  Explanation 

ANSWER: 75%

Explanation:
No explanation is available for this question!


48)   Which of the following potassium fertilizers are more useful for horticultural crops tobacco & potatoes?

a. KCI
b. KNO3
c. K2SO4
d. KMnO4
Answer  Explanation 

ANSWER: KNO3

Explanation:
No explanation is available for this question!


49)   Calcarious material includes

a. lime stone
b. marble
c. chalk
d. all of the above
Answer  Explanation 

ANSWER: all of the above

Explanation:
No explanation is available for this question!


50)   Argillaceous material does not include

a. vlay
b. marine shells
c. slate
d. blast furnace slag
Answer  Explanation 

ANSWER: marine shells

Explanation:
No explanation is available for this question!