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Q:

In modern periodic table while going from top to bottom in a group ______.

 

A) size of an atom increases B) size of an atom decreases
C) ionisation energy of an atom increases D)  size and ionisation energy of an atom increases

Answer:   D)  size and ionisation energy of an atom increases



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Atomic numbers of four elements are as follows : F(9), P(15), Cl(17), Ar(18). Which of the following two elements would be chemically similar?

A) F and Ar B) Cl and P
C) F and P D) F and Cl
 
Answer & Explanation Answer: D) F and Cl

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Factors that may influence enzyme activity?

 

A) pH B) Substrate concentration
C) Temperature D) All the above
 
Answer & Explanation Answer: D) All the above

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Which term describes an enzyme?

A) reactant B) catalyst
C) substrate D) product
 
Answer & Explanation Answer: B) catalyst

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In a combination reaction there can be ______.

 

I. two or more than two reactants

II. two or more than two products

III. only one product

 

A) Only I   B) Only I and III
C) Only I and II D) Only II
 
Answer & Explanation Answer: B) Only I and III

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Which statement(s) is/are CORRECT regarding Dalton’s Atomic theory?

 

I. All matters are made of very tiny particles.

II. Atoms of different elements have different masses and chemical properties.

III. The relative number of atoms is variable in any compound.

 

A) Only I and II B) Only I and III
C) Only II and III D) All I, II and III
 
Answer & Explanation Answer: A) Only I and II

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In the Modern Periodic Table, elements are arranged in

A) increasing atomic mass number B) increasing atomic number
C) decreasing atomic mass number D) decreasing atomic number
 
Answer & Explanation Answer: B) increasing atomic number

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Which of the following metals is the most Malleable?

A) Al B) Zn
C) Na D) Ag
 
Answer & Explanation Answer: C) Na

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Which of the following is NOT a radioactive element?

A) Uranium B) Plutonium
C) Titanium D) Thorium
 
Answer & Explanation Answer: C) Titanium

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