The number of water molecules present in a drop of water (volume 0.0018 ml) at room temperature is
A. 1.568 × 103
B. 6.023 × 1019
C. 4.84 × 1017
D. 6.023 × 10²³
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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
The method that cannot be used for removing permanent hardness of water is
A. Adding sodium carbonate
B. Distillation
C. Adding caustic soda
D. Boiling
The elements of a VIIIA group are known as
A. Lanthanides
B. Actinides
C. Halogens
D. Nobel gases
Which one of the following decreases along the period?
A. Ionization energy
B. Atomic radius
C. Electronegativity
D. Electron affinity
4th and 5th period in periodic table are known as
A. Short period
B. Long period
C. Normal leriod
D. Very long period
The periodic table divided into S P D and F based on
A. Atomic radius
B. Electronic configuration
C. Ionization Energy
D. Electron affinity
Which of the following diffuses most quickly?
A. Solid
B. Gas
C. Liquid
D. None of these
O2 released in the process of photosynthesis comes from
A. CO2
B. Water
C. Sugar
D. Pyruvic acid
What is RDX is?
A. An instrument to measure blood pressure
B. A gene
C. A chemical used in the manufacture of fertilizers
D. An explosive