Basic Chemistry(Chemistry ) Questions and answers for exam Preparation

Question 1. Example of atom having single isotope is

carbon
calcium
gold
cadmium

Explanation:-

Answer: Option C. -> gold
Answer: (c).gold

Question 2. In ionization chamber vapors are bombarded with fast moving

protons
electrons
neutrons
antineutron

Explanation:-

Answer: Option B. -> electrons
Answer: (b).electrons

Question 3. Isotopes differ in number of

electrons
protons
neutrons
anti neutrino

Explanation:-

Answer: Option C. -> neutrons
Answer: (c).neutrons

Question 4. Products which are obtained in a chemical reaction is

production
No yield
theoretical yield
actual yield

Explanation:-

Answer: Option D. -> actual yield
Answer: (d).actual yield

Question 5. Isotopes of calcium are

seven
six
nine
twelve

Explanation:-

Answer: Option B. -> six
Answer: (b).six

Question 6. Molecular formula is determined by multiplying n with

Molar mass
atomic number
atomic mass
empirical formula

Explanation:-

Answer: Option D. -> empirical formula
Answer: (d).empirical formula

Question 7. Number of atoms or molecule present in one molar mass of an entity is known as

Bohr number
Mass number
Avogadro's number
Atomic number

Explanation:-

Answer: Option C. -> Avogadro's number
Answer: (c).Avogadro's number

Question 8. Phenomenon of isotopy was discovered by

Rutherford
Bohr
Soddy
Democritus

Explanation:-

Answer: Option C. -> Soddy
Answer: (c).Soddy

Question 9. 1 atomic mass unit is equal to

1.661x10-27
1.665x10-23
1.661x10-34
1.661x10-21

Explanation:-

Answer: Option A. -> 1.661x10-27
Answer: (a).1.661x10-27

Question 10. Units by which hydrogen atom is lighter than hemoglobin is

70000
58000
78000
68000

Explanation:-

Answer: Option D. -> 68000
Answer: (d).68000