In an estimation of bromine by Carius method,\(1.6\, g\) of an organic compound gave \(1.88 \,g\) of \(AgBr\). The mass percentage of bromine in the compound is.......... (Atomic mass, \(Ag =108, Br =80\, g\, mol ^{-1}\) )

The number of hydrogen bonded water molecule(s) associated with stoichiometry \(\mathrm{CuSO}_{4} .5 \mathrm{H}_{2} \mathrm{O}\) is .... .

Given below is the plot of the molar conductivity vs \(\sqrt{\text { concentration }}\) for KCl in aqueous solution.

If, for the higher concentration of KCl solution, the resistance of the conductivity cell is \(100 \Omega\), then the resistance of the same cell with the dilute solution is ' \(x\) ' \(\Omega\)
The value of \(x\) is __________ (Nearest integer)

An organic compound \(A\) upon reacting with \(NH_3\) gives \(B.\) On heating \(B\) gives \(C.\) \(C\) in presence of \(KOH\) reacts with \(Br_2\) to given \(CH_3CH_2NH_2. A\) is :

A volume of \(x mL\) of \(5 M NaHCO _3\) solution was mixed with 10 mL of \(2 M H _2 CO _3\) solution to make an electrolytic buffer. If the same buffer was used in the following electrochemical cell to record a cell potential of 235.3 mV , then the value of \(x =\)__________ mL (nearest integer).
\(Sn ( s )\left| Sn ( OH )_6^{2-}(0.5 M )\right| HSnO _2^{-}(0.05 M ) \mid OH ^{-} \left| Bi _2 O _3(s)\right| Bi ( s )\)
Consider upto one place of decimal for intermediate calculations
\(\left[\begin{array}{ll}\text { Given : } & E _{ HSnO _2^{-} \mid Sn ( OH )_6^{2-}}^{ o }=-0.9 V \\ & E _{ Bi _2 O _3 \mid Bi }^{ o }=-0.44 V \\ & pKa _{\left( H _2 CO _3\right)}=6.11 \\ & \frac{2.303 RT }{ F }=0.059 V \\ &\operatorname{Antilog}(1.29)=19.5\end{array}\right]\)

For the reaction \(H _{2} F _{2( g )} \rightarrow H _{2( g )}+ F _{2( g )}\) \(\Delta U =-59.6\,kJ\,mol ^{-1} \text { at } 27^{\circ}\,C\). The enthalpy change for the above reaction is (-) \(kJ mol ^{-1}\) [nearest integer] Given : \(R =8.314\,JK ^{-1}\,mol ^{-1}\)

In the following reactions, the total number of oxygen atoms in \(X\) and \(Y\) is \(........\). \(Na _2 O + H _2 O \rightarrow 2 X\) \(Cl _2 O _7+ H _2 O \rightarrow 2 Y\)

The correct order of catenation is

A gas (Molar mass \(=280\,g\,mol ^{-1}\) ) was burnt in excess \(O _{2}\) in a constant volume calorimeter and during combustion the temperature of calorimeter increased from \(298.0 K\) to \(298.45\,K\). If the heat capacity of calorimeter is \(2.5\,kJ\,K ^{-1}\) and enthalpy of combustion of gas is \(9\,kJ\,mol ^{-1}\) then amount of gas burnt is \(......g\). (Nearest Integer)

The frequency of oscillation of a mass \(m\) suspended by a spring is \(v_1\). If the length of the spring is cut to half, the same mass oscillates with frequency \(v_2\). The value of \(v_2/v_1\) is ________.

The mean and standard deviation of \(20\) observations are found to be \(10\) and \(2\), respectively. On respectively, it was found that an observation by mistake was taken \(8\) instead of \(12\) . The correct standard deviation is

Let \(p\) and \(q\) be two real numbers such that \(p+q=\) 3 and \(p^{4}+q^{4}=369\). Then \(\left(\frac{1}{p}+\frac{1}{q}\right)^{-2}\) is equal to

An ammoniacal metal salt solution gives a brilliant red precipitate on addition of dimethylglyoxime. The metal ion is :