A beam of light of λ=600 nm from a distant source falls on a single slit 1 mm wide and the resulting diffraction pattern is observed on a screen 2 m away. The distance between […]
A balloon with mass m is descending down with an acceleration a (where a
The bond length in LiF will be
Options
(a) less than that of NaF (b) more than that of KF (c) equal to that of KF (d) equal to that NaF
Correct Answer: […]
Sulphur ion is
Options
(a) square planar (b) pyramidal (c) rhombic (d) tetrahedral
Correct Answer:
tetrahedral
Explanation:
No explanation available. Be the first to write the explanation for this question by commenting […]
Element having maximum electron affinity is
Options
(a) F₂ (b) Cl₂ (c) Br₂ (d) I₂
Correct Answer:
Cl₂
Explanation:
Electron affinity generally decreases down the group due to decrease in the value of […]
The electronic configuration of chalcogens is
Options
(a) ns²np² (b) ns²np³ (c) ns²np⁴ (d) ns²np¹
Correct Answer:
ns²np⁴
Explanation:
The elements of group VI A of the periodic table are called chalcogens . […]
According to Dalton’s atomic theory the smallest partical of the matter is called
Options
(a) an ion (b) an atom (c) an electron (d) a molecule
Correct Answer:
an atom
Explanation:
One of […]
Which is purified by steam distillation
Options
(a) Aniline (b) Benzoic acid (c) petroleum (d) Naphthalene
Correct Answer:
Aniline
Explanation:
Aniline is insoluble in water and possess low vapour pressure. Hence it can […]
What is the number of mols of hydrogen atoms in 3.2g of methane
Options
(a) 0.2 (b) 0.4 (c) 0.8 (d) 2
Correct Answer:
0.8
Explanation:
No explanation available. Be the first to […]
By what factor does the average velocity of a gaseous molecule increase when the temperature (in K) is doubled
Options
(a) 2 (b) 2.8 (c) 4 (d) 1.4
Correct Answer:
1.4
Explanation:
No […]
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