Chemistry Questions and Answers for Competitive Exam

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Chemistry Questions

Q.8 The organic reaction represented by equation CH3 - CH = O + H2NOH gives CH3 - CH - NH + H2O is an example of

(A) an addition reaction

(B) a condensation reaction

(C) an oxidation reaction

(D) an elimination reaction

Ans .  B

Q.9 The number of electrons presents in H+ is

(A) zero

(B) one

(C) two

(D) three

Ans .  A

Q.10 The hottest part of the gas flame is known as

(A) luminous zone

(B) dark zone

(C) blue zone

(D) non-luminous zone

Ans .  D

Q.11 The human body is made up of several chemical elements; the element present in the highest proportion (65%) in the body is

(A) carbon

(B) hydrogen

(C) oxygen

(D) nitrogen

Ans .  C

Q.12 The isomerism which exists between CH3CHCI2 and CH2CI. CH2CI is

(A) chain isomerism

(B) functional group isomerism

(C) positional isomerism

(D) metamerism

Ans .  C

Q.13 The half-life period of an isotope is 2 hours. After 6 hours what fraction of the initial quantity of the isotope will be left behind?

(A) 1/6

(B) 1/3

(C) 1/8

(D) 1/4

Ans .  C

Q.14 The number of waves made by an electron moving in an orbit having maximum magnetic quantum number is +3

(A) 4

(B) 5

(C) 2

(D) zero

Ans .  A

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