Recent questions tagged neet

The oxidation of benzene by $V_2O_5$ in the presence of air produces -

asked Aug 21, 2018 by pady_1

1 answer

What is the mass of the precipitate formed when 50 mL of 16.9% solution of $AgNO_3$ is mixed with 50 mL of 5.8% NaCl solution ? (Ag = 107.3, N = 14, O = 16, Na = 23, Cl = 35.5)

asked Aug 21, 2018 by pady_1

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The variation of the boiling points of the hydrogen halides is in the order HF > HI > HBr > HCl. What explains the higher boiling point of hydrogen fluoride ?

asked Aug 21, 2018 by pady_1

2 answers

Number of possible isomers for the complex $[Co(en)_2Cl_2]Cl$ will be : (en = ethylene diamine)

asked Aug 21, 2018 by pady_1

1 answer

What is the pH of the resulting solution when equal volumes of 0.1 M NaOH and 0.01 M HCl are mixed ?

asked Aug 21, 2018 by pady_1

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The rate constant of the reaction $A \to B$ is $0.6 \times 10^{-3} $mole per second. If the concentration of A is 5 M, then cencentration of B after 20 minutes is -

asked Aug 21, 2018 by pady_1

0 answers

In an $S_N1$ reaction on chiral centres, there is -

asked Aug 21, 2018 by pady_1

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Which one of the following esters gets hydrolysed most easily under alkaline conditions -

asked Aug 21, 2018 by pady_1

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Reaction of a carbonyl compound with one of the following reagents involves nucleophilic addition followed by elimination of water. The reagent is -

asked Aug 21, 2018 by pady_1

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The sum of coordination number and oxidation number of the metal M in the complex $[M(en)_2(C_2O_4)]Cl$ (where en is ethylenediamine) is -

asked Aug 21, 2018 by pady_1

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The following reaction is known by the name -

asked Aug 21, 2018 by pady_1

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Two possible stero-structuers of $CH_3CHOH.COOH$, which are optically active, are called :

asked Aug 21, 2018 by pady_1

1 answer

The stability of +1 oxidation state among Al, Ga, In and Tl in creases in the sequence -

asked Aug 21, 2018 by pady_1

1 answer

The correct statement regarding defects in crystalline solids is

asked Aug 21, 2018 by pady_1

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What is the mole fraction of the solute in a 1.00 m aqueous solution ?

asked Aug 21, 2018 by pady_1

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20.0 g of magnesium carbonate sample decomposes on hating to give carbon dioxide and 8.0 g magnesium oxide. What will be the percentage purity of magnesium carbonate in the sample ?

asked Aug 21, 2018 by pady_1

1 answer

The heat of combustion of carbon to $CO_2$ is $–393.5\; kJ/mol$. The heat released upon formation of $35.2 \;g$ of $CO_2$ from carbon and oxygen gas is -

asked Aug 21, 2018 by pady_1

1 answer

Hybridization involved in complex the $[Ni(CN)_4]^{2–}$ is : (At. No. Ni = 28)

asked Aug 21, 2018 by pady_1

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A gas such as carbon monoxide would be most likely to obey the ideal gas law at :

asked Aug 21, 2018 by pady_1

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Which of the following statements is not correct for a nucleophile?

asked Aug 21, 2018 by pady_1

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If Avogadro number NA, is changed from $6.022 \times 10^{23} mol^{–1}$ to $6.022 \times 10^{20} \;mol^{–1}$, this would change :

asked Aug 21, 2018 by pady_1

1 answer

The name of complex ion, $[Fe(CN)_6]^{3–}$ is :

asked Aug 21, 2018 by pady_1

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Which of the statements given below is incorrect ?

asked Aug 21, 2018 by pady_1

0 answers

The vacant space in bcc lattice unit cell is :

asked Aug 21, 2018 by pady_1

1 answer

Reaction of phenol with chloroform in presence of dilute sodium hydroxide finally introduces which one of the following functional group ?

asked Aug 21, 2018 by pady_1

1 answer

Assuming complete ionization, same moles of which of the following compounds will require the least amount of acidified $KMnO_4$ for complete oxidation?

asked Aug 21, 2018 by pady_1

2 answers

In the reaction with HCl, an alkene reacts in accordance with the Markovnikov's rule, to give a product 1-chloro-1- methylcyclohexane. The possible alkene is :

asked Aug 21, 2018 by pady_1

1 answer

In which of the following pairs, both the species are not isostructural ?

asked Aug 21, 2018 by pady_1

1 answer

The number of water molecules is maximum in :

asked Aug 21, 2018 by pady_1

1 answer

Decreasing order of stability of $O_2, O_2^-, O_2^+$ and $O_2^{2-}$ is :

asked Aug 21, 2018 by pady_1

1 answer

Strong reducing behaviour of $H_3PO_2$ is due to :

asked Aug 21, 2018 by pady_1

1 answer

On heating which of the following releases $CO_2$ most easily ?

asked Aug 21, 2018 by pady_1

1 answer

Caprolactam is used for the manufacuture of :

asked Aug 21, 2018 by pady_1

1 answer

Aqueous solution of which of the following compounds is the best conductor of electric current ?

asked Aug 21, 2018 by pady_1

1 answer

Which one of the following pairs of solution is not an acidic buffer ?

asked Aug 21, 2018 by pady_1

1 answer

If the equilibrium constant for $N_2 (g) + O_2(g) \leftrightharpoons 2NO (g) $ is $K$, the equilibrium constant for $\frac{1}{2} N_2(g) + \frac{1}{2}O_2 (g) \leftrightharpoons NO (g) $ will be :

asked Aug 21, 2018 by pady_1

1 answer

The number of structural isomers possible from the molecular formula $C_3H_9N$ is

asked Aug 21, 2018 by pady_1

1 answer

The formation of the oxide ion, $O^{2–}$ (g), from oxygen atom requires first an exothermic and then an endothermic step as shown below : $O(g) + e^- \to O^- (g), \Delta_f H^{\ominus} = -141 kJ\;mol^{-1}$ $O^-(g) + e^- \to O^{2-} (g), \Delta_f H^{\ominus} = +780 kJ\;mol^{-1}$ Thus process of formation of $O^{2–}$ in gas phase is unfavourable even though $O^{2–}$ is isoelectronic with neon. It is due to the fact that :

asked Aug 21, 2018 by pady_1

1 answer

Gadolinium belongs to 4f series. It's atomic number is 64. Which of the following is the correct electronic configuration of gadolinium?

asked Aug 21, 2018 by pady_1

1 answer

2,3-Dimethyl-2-butene can be prepared by heating which of the following compounds with a strong acid?

asked Aug 21, 2018 by pady_1

1 answer

Which of the following compounds will undergo racemisation when solution of KOH hydrolysis?

asked Aug 21, 2018 by pady_1

1 answer

If 20 J of energy is trapped at producer level, then how much energy will be available to peacock as food in the following chain ? plant $\to$ mice $\to$ snake $\to$ peacock

asked Aug 20, 2018 by pady_1

1 answer

A scrubber in the exhaust of a chemical industrial plant removes:

asked Aug 20, 2018 by pady_1

1 answer

Given below is the representation of the extent of global diversity of invertebrates. What groups the four portions ( A - D) represent respectively ?

asked Aug 20, 2018 by pady_1

1 answer

Give below is a simplified model of phosphorus cycling in a terrestrial ecosystem with four blanks (A-D). Identify the blanks.

asked Aug 20, 2018 by pady_1

1 answer

Just as a person moving from Delhi to Shimla to escape the heat for the duration of hot summer, thousands of migratory birds from Siberia and other extremely cold northern regions move to:

asked Aug 20, 2018 by pady_1

1 answer

What gases are produced in anaerobic sludge digesters?

asked Aug 20, 2018 by pady_1

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To obtain virus- free healthy plants from a diseased one by tissue culture technique, which part/parts of the diseased plant will be taken ?

asked Aug 20, 2018 by pady_1

1 answer

At which stage of HIV infection does one usually show symptoms of AIDS?

asked Aug 20, 2018 by pady_1

2 answers

Which is the particular type of drug that is obtained from the plants whose one flowering branch is shown below?

asked Aug 20, 2018 by pady_1

1 answer

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