The oxidation numbers of hydrogen in KH,MgH₂ and NaH are respectively
The oxidation numbers of hydrogen in KH,MgH₂ and NaH are respectively
Options
(a) 2,1 and -2 (b) 1,1 and 1 (c) -1, -1 and -1 (d) -2 , -3 and -1
Correct Answer: […]
Chemistry
If 0.1 M of a weak acid is taken, and its percentage of degree of ionization
If 0.1 M of a weak acid is taken, and its percentage of degree of ionization is 1.34%, then calculate its ionization constant.
Options
(a) 0.8 x 10⁻⁵ (b) 1.79 x 10⁻⁵ (c) […]
Arrange the following in increasing order of acidity H₃PO₄ , H₂CO₃ , HCl , HI
Arrange the following in increasing order of acidity H₃PO₄ , H₂CO₃ , HCl , HI
Options
(a) H₂CO₃ < H₃PO₄ < HCl < HI (b) H₃PO₄ < HCl < H₂CO₃ < HI (c) […]
Which of the following is always feasible
Which of the following is always feasible
Options
(a) ΔH = TΔS (b) ΔH (+ve),TΔS(-ve) and ΔH>TΔS (c) ΔH(-ve),TΔS(+ve) and ΔH< TΔS (d) ΔH(-ve), TΔS(-ve) and ΔH>TΔS
Correct Answer:
ΔH(-ve),TΔS(+ve) and ΔH< TΔS […]
If in a container no mass and no heat exchange occurs then it constitutes a
If in a container no mass and no heat exchange occurs then it constitutes a
Options
(a) closed system (b) open system (c) isolated system (d) imaginary system
Correct Answer:
isolated system
Explanation:
An […]
Which type of bond is there in H₂S molecules
Which type of bond is there in H₂S molecules
Options
(a) ionic bond (b) coordinate (c) covalent bond (d) all of these
Correct Answer:
covalent bond
Explanation:
No explanation available. Be the first […]
Which of the following hydrogen bonds are strongest in vapour phase
Which of the following hydrogen bonds are strongest in vapour phase
Options
(a) HF — HF (b) HF — HCl (c) HCl — HCl (d) HF — HI
Correct Answer:
HF — HF
The first ionisation potential will be maximum for
The first ionisation potential will be maximum for
Options
(a) lithium (b) hydrogen (c) uranium (d) iron
Correct Answer:
hydrogen
Explanation:
No explanation available. Be the first to write the explanation for this […]
The amount of energy,which is released due to the addition of extra electron
The amount of energy,which is released due to the addition of extra electron to the outermost orbital of gaseous atom,is called
Options
(a) ionisation potential (b) electron affinity (c) electron capacity (d) electronegativity
The number of unpaired electrons in 1s² 2s² 2p³ is
The number of unpaired electrons in 1s² 2s² 2p³ is
Options
(a) 3 (b) 1 (c) 5 (d) 2
Correct Answer:
3
Explanation:
1s² 2s² 2p³ ⇒ [1s² 2s² 2p¹(x) 2p¹(y) 2p¹(z)] / unpaired […]