Question 6 :
The gaseous product(s) expected at room temperature by reaction of sodium borohydride an boron trifluoride under anhydrous conditions is/are :
Question 8 :
The correct order of reducing abilities of hydrides of $V$ group elements is:
Question 9 :
Assertion: $H_{3}PO_{4}$ and $H_{3}PO_{3}$ both are present in fertilizers.
Reason: $H_{3}PO_{3}$ increases the solubility of fertilizers.
Question 13 :
Which of the following metal forms a protective oxide layer to prevent corrosion?
Question 15 :
Assertion: In water, orthoboric acid behaves as a weak monobasic acid.
Reason: In water, orthoboric acid acts as a proton donor.
Question 17 :
A Si and a Ge diode has identical physical dimensions. The band gap in Si is larger than that in Ge. An identical reverse bias is applied across the diodes
Question 21 :
Which metal powder suspended in oil is used as a paint for mirrors?<br/>
Question 24 :
Which of the following member of the carbon family does not have an allotrope?
Question 26 :
Choose the correct order of $C - C$ bond length in the given compounds:
Question 30 :
Assertion: Anhydrous ${Al Cl_3}$ is covalent while aqueous ${Al Cl_3}$ is ionic.
Reason: In water ${Al Cl_3}$ is present as ${Al^{3+}}$ and ${Cl^{-}}$ ion.
Question 34 :
In which of the following the inert pair effect is most prominent?
Question 38 :
Among III-A group elements the elements with highest and lowest I.P. values are:
Question 39 :
<b><u>Assertion:</u></b> $Al(OH)_{3}$ is amphoteric in nature.<br><b><u>Reason:</u></b> It can not be used as an antacid. <br>
Question 40 :
Which of the following tendencies remain unchanged on going down in nitrogen group?
Question 41 :
Assertion: B and C from their stable halides as $BX_{3}$ and $CX_{4}$, while Tl and Pb produce their stable halides as TiX and $PbX_{2}$.
Reason: Both $PbX_{4}$ and $TlX_{3}$ are strong oxidizing agent.
Question 42 :
The correct statement with respect to the property of IV B group elements is:<br/>
Question 43 :
The first member of the p-block elements differs from the remaining members of their corresponding groups due to :
Question 44 :
Anhydrous ${AlCl_3}$ is covalent however when it is dissolved in water hydrated ionic species are formed. This transformation is owing to: <br/>
Question 47 :
The element $Z = 114$ has been discovered recently. It will belong to which of the following family/ group and electronic configuration?
Question 49 :
Addition of HCl to an aqueous solution of $Pb(NO_3)_2$ gives a
Question 50 :
Consider the reaction, $LiH+AlH_{3}\rightarrow .....$ <br/>Which is the incorrect statement about this reaction?
Question 51 :
Why does one who drinks alcohol get tempted to drink more alcohol?
Question 53 :
Phosphorus undergoes slow combustion and glows in dark. The process is called:
