Chemistry Questions and Answers for Competitive Exam

Chemistry GK Questions and Answers

Q.36 The most electropositive elements among the following is

(A) Na

(B) Ca

(C) K

(D) Cs

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Q.37 The number of waves in n x 10th Bohr's orbit is

(A) n2

(B) n

(C) n-2

(D) n3

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Q.38 The mass of one Avogadro number of helium atom is

(A) 1.00 gram

(B) 4.00 gram

(C) 8.00 gram

(D) 4 x 6.02 x 1023 gram

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Q.39 The items amenable to detection by soft x-rays are

(A) contrabands

(B) lead in bullets

(C) narcotics

(D) genuine coins from counterfeit coins

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Q.40 The material which can be deformed permanently by heat and pressure is called a

(A) thermoplastic

(B) thermoset

(C) chemical compound

(D) polymer

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Q.41 The mass number of a nucleus is

(A) always less than its atomic number

(B) the sum of the number of protons and neutrons present in the nucleus

(C) always more than the atomic weight

(D) a fraction

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Q.42 The inexpensive and commonly used variety of glass is called soda glass. It is called so because

(A) was used initially for making bottles of soda(carbonated drink)

(B) is made using soda(sodium carbonate)

(C) was initially used for storing sodium carbonate

(D) is made using soda lime

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