Options:
- A. 6.022 x 1023 atoms of oxygen
- B. 22-gram electrons
- C. 6.022 x 1023 atms of carbon
- D. both B. & C.
View Answer
D. both B. & C.
Chemistry
Which of the following are isoelectronic species ?
Options:
- A. H+ H H-
- B. Li+ Na+ K+
- C. C1- Br- I
- D. F- Ne Na+
View Answer
D. F- Ne Na+
The number of isotopes of elements with even mass number and even atomic number are ________________?
Options:
- A. 280
- B. 300
- C. 154
- D. 54
View Answer
C. 154
Molecular ions are formed by passing______________________?
Options:
- A. High energy electron beam
- B. ?
- C. X-rays
- D. All of the above
View Answer
D. All of the above
Which of the following terms is not used for ionic compound ?
Options:
- A. formula unit
- B. empirical formula
- C. molecular formula
- D. formula mass
View Answer
C. molecular formula
Which one is true about isotope ?
Options:
- A. Same number of neutrons
- B. Same mass number
- C. Same physical properties
- D. Same chemical properties
View Answer
D. Same chemical properties
moles of each aluminium and oxygen react with each other to produce aluminium oxide. The amount of product formed is______________________?
Options:
- A. 0.18 mole
- B. 0.27 mole
- C. 0.24 mole
- D. 0.09 mole
View Answer
A. 0.18 mole
Which one of the following has the maximum number of isotopes ?
Options:
- A. oxygen
- B. carbon
- C. tin
- D. chlorine
View Answer
C. tin
The volume occupied by 2.8 g of N2 at STP______________________?
Options:
- A. 2.24 dm3
- B. 22.4 dm3
- C. 1.12 dm3
- D. 112 dm3
View Answer
A. 2.24 dm3
The number of moles of CO2 which contains 16 g of oxygen is__________________?
Options:
- A. 0.25
- B. 0.5
- C. 0.75
- D. 1
View Answer
B. 0.5