Chemistry Questions and Answers for Competitive Exam

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

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

(A) zero

(B) one

(C) two

(D) three

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

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

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

(A) chain isomerism

(B) functional group isomerism

(C) positional isomerism

(D) metamerism

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

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

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