eSaral - JEE | NEET | Class 8-10 Exam Prep App

How many electrons are involved in the following redox reaction?

Question: How many electrons are involved in the following redox reaction? $\mathrm{Cr}_{2} \mathrm{O}_{7}^{2-}+\mathrm{Fe}^{2+}+\mathrm{C}_{2} \mathrm{O}_{4}^{2-} \rightarrow \mathrm{Cr}^{3+}+\mathrm{Fe}^{3+}+\mathrm{CO}_{2}$ (Unbalanced)3456Correct Option: , 4 Solution: Solution Not Required...

The gas liberated

Question: The gas liberated by the electrolysis of Dipotassium succinate solution is :EthyneEthenePropeneEthaneCorrect Option: , 2 Solution: Solution is not required...

Which one of the following exhibits the largest number of oxidation states ?

Question: Which one of the following exhibits the largest number of oxidation states ?Mn(25)V(23)Cr (24)Ti (22)Correct Option: 1 Solution: Solution Not Required...

Solve the following

Question: $\mathrm{K}_{\mathrm{f}}$ for water is $1.86 \mathrm{~K} \mathrm{~kg} \mathrm{~mol}{ }^{-1}$. If your automobile radiator holds $1.0 \mathrm{~kg}$ of water, how many grams of ethylene glycol $\left(\mathrm{C}_{2} \mathrm{H}_{6} \mathrm{O}_{2}\right)$ must you add to get the freezing point of the solution lowered to $-2.8^{\circ} \mathrm{C} ?$ 27 g72 g93 g39 gCorrect Option: , 3 Solution:...

Which one of the following class

Question: Which one of the following class of compounds is obtained by polymerization of acetylene ?Poly-enePoly-ynePoly-amidePoly-esterCorrect Option: , 2 Solution:...

Copper becomes green when exposed to moist air for a long period. This is due to :-

Question: Copper becomes green when exposed to moist air for a long period. This is due to :-the formation of a layer of cupric oxide on the surface of copper.the formation of basic copper sulphate layer on the surface of the metalthe formation of a layer of cupric hydroxide on the surface of copper.the formation of a layer of basic carbonate of copper on the surface of copper.Correct Option: , 4 Solution: Solution Not Required...

In the hydroboration - oxidation

Question: In the hydroboration - oxidation reaction of propene with diborane, $\mathrm{H}_{2} \mathrm{O}_{2}$ and $\mathrm{NaOH}$, the organic compound formed is :$\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{OH}$$\left(\mathrm{CH}_{3}\right)_{3} \mathrm{COH}$$\mathrm{CH}_{3} \mathrm{CHOHCH}_{3}$$\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{OH}$Correct Option: 1 Solution:...

The degree of dissociation (?) of a weak electrolyte,

Question: The degree of dissociation (1) of a weak electrolyte, $A_{x} B_{y}$ is related to van't Hoff factor (i) by the expression :- $\alpha=\frac{x+y-1}{i-1}$$\alpha=\frac{x+y+1}{i-1}$$\alpha=\frac{i-1}{(x+y-1)}$$\alpha=\frac{i-1}{x+y+1}$Correct Option: , 3 Solution:...

Which of the following is not formed when

Question: Which of the following is not formed when $\mathrm{H}_{2} \mathrm{~S}$ reacts with acidic $\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}$ solution ?$\mathrm{K}_{2} \mathrm{SO}_{4}$$\mathrm{Cr}_{2}\left(\mathrm{SO}_{4}\right)_{3}$S$\mathrm{CrSO}_{4}$Correct Option: , 4 Solution: Solution Not Required...

The number and type of bonds

Question: The number and type of bonds in $\mathrm{C}_{2}^{2-}$ ion in $\mathrm{CaC}_{2}$ are:Two $\sigma$ bonds and one $\pi$ - bondTwo $\sigma$ bonds and two $\pi$ - bondsOne $\sigma$ bond and two $\pi$ - bondsOne $\sigma$ bond and one $\pi$ - bondCorrect Option: , 3 Solution:...

The degree of dissociation () of a weak electrolyte,

Question: The degree of dissociation (1) of a weak electrolyte, $A_{x} B_{y}$ is related to van't Hoff factor (i) by the expression :- $\alpha=\frac{x+y-1}{i-1}$$\alpha=\frac{x+y+1}{i-1}$$\alpha=\frac{i-1}{(x+y-1)}$$\alpha=\frac{i-1}{x+y+1}$Correct Option: , 3 Solution:...

The major organic compound

Question: The major organic compound formed by the reaction of $1,1,1$-trichloroethane with silver powder is :-2-Butyne2-ButeneAcetylenEtheneCorrect Option: 1 Solution:...

The equation which is balanced and represents the correct product (s) is:

Question: The equation which is balanced and represents the correct product (s) is:Correct Option: , 4 Solution: Solution Not Required...

In the given transformation,

Question: In the given transformation, which of the following is the most appropriate reagent ? $\mathrm{NaBH}_{4}$$\mathrm{NH}_{2} \mathrm{NH}_{2}, \stackrel{\ominus}{\mathrm{OH}}$$\mathrm{Zn}-\mathrm{Hg} / \mathrm{HCl}$$\mathrm{Na}, \mathrm{Liq} \cdot \mathrm{NH}_{3}$Correct Option: , 2 Solution: Solution not required...

Ethylene glycol is used as an antifreeze in a cold climate.

Question: Ethylene glycol is used as an antifreeze in a cold climate. Mass of ethylene glycol which should be added to $4 \mathrm{~kg}$ of water to prevent it from freezing at $-6^{\circ} \mathrm{C}$ will be : $\left(\mathrm{K}_{\mathrm{f}}\right.$ for water $=1.86 \mathrm{~K} \mathrm{kgmol}^{-1}$, and molar mass of ethylene glycol $\left.=62 \mathrm{gmol}^{-1}\right)$400.00 g304.60 g804.32 g204.30 gCorrect Option: , 3 Solution:...

2-Hexyne gives trans-2-Hexene on treatment with :-

Question: 2-Hexyne gives trans-2-Hexene on treatment with :-$\mathrm{LiAlH}_{4}$$\mathrm{Pt} / \mathrm{H}_{2}$$\mathrm{Li} / \mathrm{NH}_{3}$$\mathrm{Pd} / \mathrm{BaSO}_{4}$Correct Option: , 3 Solution:...

A 5% solution of cane sugar (molar mass 342) is isotonic

Question: A $5 \%$ solution of cane sugar (molar mass 342 ) is isotonic with $1 \%$ of a solution of an unknown solute. The molar mass of unknown solute in $\mathrm{g} / \mathrm{mol}$ is :- 136.2171.268.434.2Correct Option: , 3 Solution:...

Which series of reactions correctly represents chemical relations related to iron and its compound?

Question: Which series of reactions correctly represents chemical relations related to iron and its compound?Correct Option: , 2 Solution: Solution Not Required...

A 5% solution of cane sugar (molar mass 342) is isotonic

Question: A $5 \%$ solution of cane sugar (molar mass 342 ) is isotonic with $1 \%$ of a solution of an unknown solute. The molar mass of unknown solute in $\mathrm{g} / \mathrm{mol}$ is :- 136.2171.268.434.2Correct Option: Solution:...

Ozonolysis of an organic compound

Question: Ozonolysis of an organic compound 'A' produces acetone and propionaldehyde in equimolar mixture. Identify 'A' from the following compounds :-2 -Methyl-1-pentene1-Pentene2-Pentene2-Methyl-2-penteneCorrect Option: , 4 Solution:...

Ozonolysis of an organic compound

Question: Ozonolysis of an organic compound gives formaldehyde as one of the products. This confirms the presence of :-an isopropyl groupan acetylenic triple bondtwo ethylenic double bondsa vinyl groupCorrect Option: , 4 Solution:...

The molality of a urea solution in which 0.0100g of urea,

Question: The molality of a urea solution in which $0.0100 \mathrm{~g}$ of urea, $\left[\left(\mathrm{NH}_{2}\right)_{2} \mathrm{CO}\right]$ is added to $0.3000 \mathrm{dm}^{3}$ of water at STP is :- 0.555 m$5.55 \times 10^{-4} \mathrm{~m}$33.3 m$3.33 \times 10^{-2} \mathrm{~m}$Correct Option: , 2 Solution:...

When a small amount of

Question: When a small amount of $\mathrm{KMnO}_{4}$ is added to concentrated $\mathrm{H}_{2} \mathrm{SO}_{4}$, a green oily compound is obtained which is highly explosive in nature. Compound may be:$\mathrm{Mn}_{2} \mathrm{O}_{3}$$\mathrm{MnSO}_{4}$$\mathrm{Mn}_{2} \mathrm{O}_{7}$$\mathrm{MnO}_{2}$Correct Option: Solution:...

One mole of a symmetrical

Question: One mole of a symmetrical alkene on ozonolysis gives two moles of an aldehyde having a molecular mass of $44 \mathrm{u}$. The alkene is :-EthenePropene1-Butene2 -ButeneCorrect Option: , 4 Solution:...

The element with which of the following outer electron configuration may exhibit the

Question: The element with which of the following outer electron configuration may exhibit the largest number of oxidation states in its compounds :$3 \mathrm{~d}^{7} 4 \mathrm{~s}^{2}$$3 \mathrm{~d}^{8} 4 \mathrm{~s}^{2}$$3 \mathrm{~d}^{5} 4 \mathrm{~s}^{2}$$3 \mathrm{~d}^{6} 4 \mathrm{~S}^{2}$Correct Option: , 3 Solution: $\mathrm{Mn} \longrightarrow \mathrm{Mn}^{+7}$...

All Study Material