Chemistry Class 9th

281- The sign of delta is.

A) g

B) &

C) δ

282-The delta indicates the partial

A) Positive

B) Negative

C) Both a and b

283- The compounds resulting from polar covalent bond

A) Polar compound

B) Non-polar compound

C) Dative bond

284-Metallic bond is formed between ______ atoms.

A) Bond

B) Metal

C) Molecules

285- In metallic bond _____ charge ions is used

A) Positively

B) Negatively

C) Stable

286- The different properties of metals

A) High melting

B) Hard and heavy nature

C) All of these

287- In case of metals, the hold of nucleus over outermost shell is ______.

A) Strong

B) Weak

C) More

288- The forces that hold atom in a compound are

A) Chemical bond

B) Covalent bond

C) Metallic bond

289-Addition of strong bonding forces relatively weak forces also exist between _____

A) Atom

B) Molecule

C) Bond

290- Chemical bond requires about ____ energy to break intermolecular forces.

A) High

B) Low

C) Both a and b

291-All intermolecular forces are collectively called

A) Chemical bonds

B) Van der waals

C) Henry brigs

292- Result from attraction the opposite charges may be.

A) Temporary

B) Permanent

C) Both a and b

293- The unequal sharing of electron b/w different types of atom makes one end of molecule and other

A) slightly positive

B) Slightly negative

C) Both a and b

294-when partial positive and partial negative exist in different position the adjacent molecules will

A) Arrange

B) Stable

C) De-arrange

295. The atoms which attracts the bond pair more strongly than it is called as

A) More electronegative

B) More electropositive

C) Less electronegative

296- hydrogen bonding is _______ of intermolecular forces.

A) Special type

B) Common type

C) Main type

297- Hydrogen bonding present in -------molecules.

A) Polar

B) All

C) Both a and b

298-Hydrogen bonding considered unique.

A) Hydrogen

B) Dipole-dipole attraction

C) Intermolecular forces

299- The covalent bond between hydrogen atom and other atom become polar enough to create _____ on hydrogen atom.

A) Partial positive

B) Partial negative

C) Partial permanent

300- Hydrogen bonding present in

a) In ice

B) In dimond

C) In graphite