Answer Posted / guest

Isotope:-These can be defined as forms of some element
having the same at number, but different weight due to
different nuclear structures. Atomic Weight of these
elements are only average weights on mixture of isotopes

Isobars:-These are defined as atoms of different elements
with different atomic numbers but same atomic weight

Stable configuration:-This concept was put forward by Lewis,
Langmioir. According to this the electronic arrangement in
which eight electrons are present in the outermost orbit is
known as stable configuration

Electronic Theory of Valency:-The electronic present in
outermost orbit of an atom determine its valency and these
are known as valency electrons. If the valency electrons are
removed the reminder of atom is known as kernel of atom

Valency:-It can be defined according to electronic theory as
the number of electron it can lend, barrow or store. A
lending at atom is known as electro positive while borrowing
atom is called as electronegative

What are hard waters?

998

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Give the principle of potentiometer titration.

1017

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What is colorimetry?

1103

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Which of the above conductivity measured during conductometric titration?

1043

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Explain acid gas?

1021

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Differentiate between modern periodic table and mendeleevs table?

1148

---

Explain the structure of a dna molecule?

1039

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Why is disodium salt of edta preferred to edta?

1520

---

What are the constituents of cements?

1042

---

Which wavelengths are visible to human eye?

1209

---

What are the factors that affect the viscosity of a liquid?

998

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What is fluidity of a liquid?

1065

---

When a glass rod is heated gradually and suddenly dipped in cold water, it cracks. What is the reason?? When a cool glass rod is suddenly heated, it cracks. Why?

1005

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What is the application of hardness date in environmental engineering practice?

1384

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How are pka and strength of a weak acid related?

1014

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