Decomposition of \(H _2 O _2\) follows a first order reaction.
In 50 min , the concentration of \(H _2 O _2\) decreases from 0.5 to 0.125 M.
When the concentration of \(H _2 O _2\) reaches 0.05 M.
the rate of formation of \(O _2\) will be (Given \(\log 2=0.3010\) ) :

The electrolyte used in mercury cell is

Which of the following is an ore of copper

Which transition metal group is known as coinage metals?

Which among the following metals shows 6 secondary valencies ?
(A) 1 mole of \(PdCl _2 \cdot 4 NH _3\) reacts with excess of \(AgNO _3\) to give 2 moles of AgCl precipitated
(B) 1 mole of \(NiCl _2 \cdot 6 H _2 O\) reacts with excess of \(AgNO _3\) to give 2 moles of AgCl precipitated
(C) 1 mole of \(PtCl _4 \cdot 2 HCl\) does not give reaction with \(AgNO _3\)
(D) 1 mole of \(CoCl _3 \cdot 4 NH _3\) reacts with excess of \(AgNO _3\) to give 1 mole of AgCl precipitated
(E) 1 mole of \(PtCl _2 \cdot 2 NH _3\) does not give reaction with \(AgNO _3\)
Choose the correct answer from the options given below :

2.5 g of the following substances are dissolved in 500 mL of water. Arrange the resultant solutions in increasing order of their molarity ;
(A) \(C _6 H _{12} O _6\left(180 g mol ^{-1}\right)\)
(B) \(NH _2 CONH _2\left(60 g mol ^{-1}\right)\)
(C) \(NaCl \left(58.5 g mol ^{-1}\right)\)
(D) \(MgSO _4\left(120 g mol ^{-1}\right)\)
Choose the correct order from the options given below :

Arrange the following compounds in decreasing order of their acidity.
(A) Acetic acid
(B) Chloroacetic acid
(C) Dichloroacetic acid
(D) Trichloroacetic acid
Choose the correct answer from the options given below:

Two photons of equal energy 8 MeV each, strikes two different metal sheets having work functions 4 MeV and 6 MeV, respectively. The ratio of maximum velocity of electrons emitted from two metal sheets respectively is :

A wire has a resistance of \( 3 \text{ } \Omega \) at 20°C and \( 5 \text{ } \Omega \) at 100°C. The temperature coefficient of resistance of the wire is:

Solution of the differential equation \(\frac{d y}{d x}=1+x+y+x y\) are :

What is the colour of the third band of a coded resistor of resistance 3.2 \(\times 10^3\) \(\Omega\) ?

Answer the question on basis of passage given below :
Lyophobic sols like those of metals (Au, Ag, etc) are unstable and are easily precipitated by addition of electrolytes. However, it is observed that the addition of certain lyophilic colloids like gums, soaps, gelatine, etc. to lyophobic colloids (like a metal sol) render lyophobic colloids difficult to coagulate by the addition of electrolytes. The process is known as 'protection' and the lyophilic colloids are termed as Protective colloids. It is believed that the protective action of the lyophilic colloids is due to the covering up of the particles of the lyophobic colloid by those of the lyophilic colloid.
Evidently, smaller the gold number of a protective colloid, the greater is its protective action.
Which of the following has the highest flocculating power for a positive sol?

Area bounded by the curve \(|x|+|y|=1\) is: