Chemistry Class 9th
261-The sign of single covalent bond is _____.
A) –
B) +
C) =
262- In single covalent bond, one electron is contributed by _____ bonded atom.
A) Single
B) Double
C) Each
263- double covalent bond is indicated by ______.
A) –
B) +
C) =
264- In double covalent bond, each bonded atom contributes
A) Two bonded
B) Single bonded
C) Both a and b
265- Three lines are used to indicate covalent bond.
A) Single
B) Double
C) Triple
266- The electronic configuration of valence shells is shown with small.
A) Dots
B) Crosses
C) Both a and b
267- Which scientist describe standard method of electronic configuration of valence shell of atom.
A) J. Charles
B) Robert Boyle’s
C) Lewis structure diagram
268- The bond pair of electron is donated by one bond atom only.
A) Ionic bond
B) Coordinate covalent bond
C) Polar covalent bond
269-- Electronegativity --------- across a period.
A) Increases
B) Decreases
C) Remains same
270- The atom which accept the electron pair.
A) Share
B) Lone pair
C) Acceptor
271- A small --------- is used to indicate the atom and pair of electron.
A) Arrow
B) Equal
C) Hyphen
272-The head of arrow is ______ the acceptor atom.
A) toward
B) beside
C) front
273- The non-bonded electron pair available on an.
A) Atom
B) Donor
C) Acceptor
274- The chemical formula of ammonium is.
A) NH3
B) NH4
C) HCl
275- The name of chemical formula of BF3 is.
A) Boron
B) Triflouride
C) Boron triflouride
276- In non-polar covalent bond it is formed b/w two.
A) Similar atom
B) Different atoms
C) Stable atom
277-In other non-polar bonds, this type of bond is called _____.
A) Pure covalent bond
B) Non-pure covalent bond
C) Metallic bond
278- In polar covalent bond it is formed b/w two
A) Similar atom
B) Different atom
C) Sharing atoms
279. The atoms which attracts the bond pair more strongly than it is called as 2
A) More electronegative
B) More electropositive
C) Less electronegative
280-Polar covalent bond is formed when there will be ______ attraction.
A) Unequal
B) Equal
C) Strong