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1
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



Explanation:
Subject: Chemistry
Exam Prep: Bank Exams
Related Questions
Q:

Ozone is an ______ of oxygen.

A) Allotrope B) Isotope
C) Isobar D) Isotone
 
Answer & Explanation Answer: A) Allotrope

Explanation:
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0 1371
Q:

Which of the following is an Inert Gas?

A) Hydrogen B) Nitrogen
C) Oxygen D) Argon
 
Answer & Explanation Answer: D) Argon

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1 1739
Q:

pH of the human blood is ______.

A) Slightly Acidic B) Highly Acidic
C) Slightly Basic D) Highly Basic
 
Answer & Explanation Answer: C) Slightly Basic

Explanation:
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1 1338
Q:

A radio-active substance has a half life of six months. Three-fourth of the substance will decay in ______.

A) Six months B) Ten months
C) Twelve Months D) Twenty four months
 
Answer & Explanation Answer: C) Twelve Months

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0 1172
Q:

Chemical composition of cement is

A) Limestone and Clay B) Limestone, Clay and Gypsum
C) Limestone and Gypsum D) Clay and Gypsum
 
Answer & Explanation Answer: B) Limestone, Clay and Gypsum

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0 928
Q:

The most abundant element in the earth's atmosphere is

A) Argon B) Nitrogen
C) Oxygen D) Krypton
 
Answer & Explanation Answer: B) Nitrogen

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0 1011
Q:

Consider the following constituent gases of the atmosphere :

1. Argon

2. Neon

3. Helium

4.Ceirbon dioxide

Which one of the following is the correct ascending sequence of the above gases in terms of the volume percentage?

A) 1-3-2-4 B) 1-4-2-3
C) 4-2-3-1 D) 2-4-1-3
 
Answer & Explanation Answer: B) 1-4-2-3

Explanation:
Composition of Dry Air (Substance, % by volume)
Nitrogen, N2 78.08
Oxygen, O2
20.95
Argon, Ar 0.93
Carbon dioxide, CO2 0.033
Neon, Ne 0.0018
Helium, He 0.00052
Methane, CH4 0.0002
Krypton, Kr 0.00011
Dinitrogen oxide, N2O 0.00005
Hydrogen, H2 0.00005
Ozone, O3 0.000001
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0 16635
Q:

Which one of the following elements will be an isobar of calcium if the atomic number of calcium is 20 and its mass number is 40?

 

A) Element with 18 neutrons and 20 protons  B) Element with 19 neutrons and 18 protons 
C) Element with 19 neutrons and 20 protons  D) Element with 18 neutrons and 22 neutrons
 
Answer & Explanation Answer: D) Element with 18 neutrons and 22 neutrons

Explanation:
Isobar: one of two or more atoms having equal atomic weights but different atomic numbers.
 
                    Mass number     Electrons      Neutrons
    Calcium            40                    20                 20
 
     Argon              40                    18                 22
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