10 g of hydrogen and 64 g of oxygen were filled in a steel vessel and exploded
10 g of hydrogen and 64 g of oxygen were filled in a steel vessel and exploded. Amount of water produced in this reaction will be
Options
(a) 3 mol (b) 4 mol […]
Chemistry
Mass of one atom of X is 2.66 x 10⁻²³ g, then its 32 g is equal to
Mass of one atom of X is 2.66 x 10⁻²³ g, then its 32 g is equal to
Options
(a) 32 x 2.66 x 10⁻²³ mol (b) 32 / (2.66 x 10⁻²³ x […]
The number of significant figures for the three numbers 161 cm, 0.161 cm
The number of significant figures for the three numbers 161 cm, 0.161 cm, 0.0161 cm are
Options
(a) 3,4,5 respectively (b) 3,4,4 respectively (c) 3,3,4 respectively (d) 3,3,3 respectively
Correct Answer:
3,3,3 respectively
Which pair of atomic numbers represents s-block elements?
Which pair of atomic numbers represents s-block elements?
Options
(a) 3,12 (b) 6,12 (c) 7,15 (d) 9,17
Correct Answer:
3,12
Explanation:
Last electron goes to s-subshell.
Volume occupied by one molecule of water (density= 1 g cm⁻³) is
Volume occupied by one molecule of water (density= 1 g cm⁻³) is
Options
(a) 9 x 10⁻²³ cm³ (b) 6.023 x 10⁻²³ cm³ (c) 3 x 10⁻²³ cm³ (d) 5.5 x 10⁻²³ cm³
³⁵₁₇Cl and ³⁷₁₇Cl are two isotopes of chlorine. If average atomic weight is 35.5
³⁵₁₇Cl and ³⁷₁₇Cl are two isotopes of chlorine. If average atomic weight is 35.5 then ratio of these two isotopes is
Options
(a) 35 : 37 (b) 1 : 3 (c) 3 : […]
The ratio of the difference in energy between first and second Bohr orbit
The ratio of the difference in energy between first and second Bohr orbit to that between the second and the third Bohr orbit is
Options
(a) 1/2 (b) 1/3 (c) 4/9 (d) 27/5
The wavelength correspending to maximum enregy for hydrogen is 91.2 nm
The wavelength correspending to maximum enregy for hydrogen is 91.2 nm. The corresponding wavelength for He⁺ ion is
Options
(a) 2.28 nm (b) 22.8 nm (c) 182.4 nm (d) 364.8 nm
Correct Answer: […]
According to Bohr’s theory, the angular momentum of electron in 5th orbit is
According to Bohr’s theory, the angular momentum of electron in 5th orbit is
Options
(a) 25 h/π (b) 1.0 h/π (c) 10 h/π (d) 2.5 h/π
Correct Answer:
2.5 h/π
Explanation:
Angular momentum […]
If Nₐ is Avagadro number then number of valence electrons in 4.2g of nitride
If Nₐ is Avagadro number then number of valence electrons in 4.2g of nitride ions (N³⁻) is
Options
(a) 2.4 Nₐ (b) 4.2 Nₐ (c) 1.6 Nₐ (d) 3.2 Nₐ
Correct Answer:
2.4 […]