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Chemistry

Chemistry
The value of Avogadro Number is

6.023 × 1022
6.023 × 1023
6.023 × 1025
6.023 × 1024

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Chemistry
The items amenable to detection by soft x-rays are

narcotics
lead in bullets
genuine coins from counterfeit coins
contrabands

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Chemistry
Which of the following can be found as pollutants in the drinking water in some parts of India? Select the correct answer using the code given below.(A) Arsenic (B) Sorbitol (C) Fluoride (D) Formaldehyde (E) Uranium

A, C and E
A, B, C, D and E
B, D and E
A and C

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Chemistry
Which of the following causes the rusting of iron? a. Oxidation b. Reduction c. Chemical reaction with oxygend. Chemical reaction with CO2

C and d
B and c
A and b
A and c

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Chemistry
Who modified Bohr's theory by introducing elliptical orbits for electron path

Sommerfeld
Rutherford
Hund
Thomson

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Chemistry
In arc welding, Argon is used because of its

Ability to lower the melting point of the metal
Low reactivity with metal
High flammability
High calorific value

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