Question

questions I. Which of the following will yield no reacticn? L Na 50daq) reacts with BalCIOaq) IIPhNO(aq) reacts with NaCKaq) IL KBelag) reacts with HC(aq) A) I B) II C) III D) Iand II E) LII, and I 2. Which is not an alkali metal?" A) Na B) H C Rb K DI E) L 3. Which of the following is inert? A) Br B) Fg) C) Heig D) Hig) E) Nats) 4 Which of the following could foem when a strong oxidizing apent is added to so L SO I So IL SO A) I B) I C III D) Iand E LII, and I Which of the following is an example of a chemical proparty? LSodium chloride dissolves in water to peoduce aqueous sodium chloride. II.Liquid water freezes to peoduce solid ice. IL Sodium metal and chlerine gas peoduce sodium chloride A) I B) I C) II D) Iand E) LII. and L 6 Which of the following postulates of Dalton's Atomic Theory remain true accoeding to modern theoey? L Atoms are indivisible particles II Atoms of a particular element have identical physical and chemical propertics IL Chemical reactions occur when atoms rearrange. No atoms are lost and no atoms ane gained. A) I B) II C) II D) Iand I E LL and II

Answer 1

1) Reaction III doesn't occur.

Whereas, reaction II is possible and precipitate of PbCl₂ forms.

Reaction I is possible because precipitate of BaSO_​​​4 forms.

Thus, option C is correct.

2) option B is correct as hydrogen is not alkali metal although it belongs to group 1 of the periodic table.

3) Helium is inert gas because it belongs to 18 group of periodic table and is having fully filled electronic configuration.

Moreover helium is a noble gas and noble gases are always inert.

Thus, option C is correct.

4) option B is correct as in this only oxidation takes place

As, SO_​​​3^{​​​​2-} to SO_{​​​​​4}^​2- is oxidation because oxidation number of

sulphur goes from +4 to +6 .

Thus, option B is correct