Options:
- A. 4.0 x 10-8
- B. 3.2 x 10-11
- C. 2.0 x 10-8
- D. 4.0 x 10-12
View Answer
B. 3.2 x 10-11
Chemistry
One mole of CO2 contains?
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.
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+
When 0.5 mole of phosphoric acid is dissolved in aqueous solution how many moles of -ve and +ve ions are collected altogether ?
Options:
- A. 0.5
- B. 1
- C. 1.5
- D. 2
View Answer
D. 2
The hardest of the following solids is__________________?
Options:
- A. sodium
- B. diamond
- C. graphite
- D. magnesium
View Answer
B. diamond
The inhaled breath of diabetics patient contain acetone. A medical student wishes to test for diabetes by asking patient to bubble their breath through a reagent ?
Options:
- A. alkaline aquenous iodine
- B. aqueous bromine
- C. Fehling solution
- D. aqueous NaOH
View Answer
A. alkaline aquenous iodine
The unit of molality is__________________?
Options:
- A. moles dm-3
- B. moles kg-1
- C. gram dm-3
- D. none
View Answer
B. moles kg-1
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
Dempsters mass spectrometer has number of zones / parts_________________?
Options:
- A. 5
- B. 4
- C. 3
- D. 2
View Answer
A. 5