Options:
- A. they cast shadow
- B. they possess momentum
- C. they are negatively charged
- D. all of the above
View Answer
B. they possess momentum
Chemistry
Which of the elements do not fall in stair case of the modern periodic table__________________?
Options:
- A. Si
- B. As
- C. Te
- D. None of the above
View Answer
D. None of the above
Which catalyst is used in contact process ?
Options:
- A. Fe2O3
- B. V2O5
- C. SO3
- D. Ag2O
View Answer
B. V2O5
Water absorber used in combustion analysis is___________________?
Options:
- A. 50% KOH
- B. Lime water
- C. CaCl2
- D. Mg (CIO4)2
View Answer
D. Mg (CIO4)2
The number of peaks obtained in mass spectrometry shows____________________?
Options:
- A. Relative abundance
- B. Average mass of element
- C. Number of isotopes
- D. Relative isotopic mass
View Answer
C. Number of isotopes
When cationic molecular ions are allowed to pass through strong magnetic field in mass spectrometer which of the following ions is fallen__________________?
Options:
- A. lighter
- B. intermediate
- C. heavier
- D. are collected at same time
View Answer
A. lighter
Combustion analysis is performed to determine__________________?
Options:
- A. Empirical formula
- B. Molecular mass
- C. Molecular formula
- D. Formula mass
View Answer
A. Empirical formula
When an electron is moving with velocity of 2.188 x 106 ms-1 in the first orbit of Bohrs model of hydrogen. The de Broglie wavelength of electron is______________?
Options:
- A. 0.33 nm
- B. 0.34 nm
- C. 0.35 nm
- D. 0.36 nm
View Answer
A. 0.33 nm
Across short period the melting and boiling point increase upto __________________?
Options:
- A. IIIA group
- B. IVA group
- C. VA group
- D. VIA group
View Answer
B. IVA group
Which of the following elements has greater 1st ionization energy__________________?
Options:
- A. B
- B. C
- C. N
- D. O
View Answer
C. N