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Recent questions in Chemistry

Questions >> EAMCET >> Chemistry

Identify the correct order in which the covalent radius of the following elements increases:

asked Nov 8, 2013 by meena.p

0 answers

3-hydroxybutanal is formed when (X) reacts with (Y) in dilute (Z) solution. What are X,Y and Z?

asked Nov 8, 2013 by meena.p

0 answers

The half-lives of two radioactive nuclides A and B are taken separately and allowed to disintegrate for 4 min. What will be the ratio of weights of A and B disintegrated?

asked Nov 8, 2013 by meena.p

0 answers

An electron is moving in Bohr's fourth orbit. It's de-Broglie wave length is $\lambda$. What is the circumference of the fourth orbit ?

asked Nov 8, 2013 by meena.p

2 answers

Which of the following , compounds is the reactant in Rosenmund's reduction?

asked Nov 8, 2013 by meena.p

0 answers

The atomic numbers of elements X,Y and Z are 19,21 and 25 respectively. The number of electrons present in the M shell of these elements follow the order:

asked Nov 8, 2013 by meena.p

1 answer

In which of the following reactions the product is an ether ?

asked Nov 8, 2013 by meena.p

1 answer

Which of the following is an example for heterogeneous catalysis reaction?

asked Nov 8, 2013 by meena.p

1 answer

Which one of the following reactions does not form gaseous product ?

asked Nov 8, 2013 by meena.p

0 answers

Identify A and B in the following reactions:

asked Nov 8, 2013 by meena.p

0 answers

Sodium is heated in air at $300 ^{\circ}C$ to form x.x absorbs $CO_2$ and forms $Na_2CO_3$ and Y. Which of the following is Y?

asked Nov 8, 2013 by meena.p

0 answers

Observe the following statements regarding purification of bauxite:

asked Nov 8, 2013 by meena.p

0 answers

The chemicals and the reaction conditions required for the preparation of ethane are :

asked Nov 8, 2013 by meena.p

0 answers

A complex compound of $Co^{3+}$ with molecular formula $CoCl_x.yNH_3$ gives a total of 3 ions when dissolved in water. How many $Cl^{-}$ ions satisfy both primary and secondary valencies in this complex ?

asked Nov 8, 2013 by meena.p

0 answers

In Fischer-Ringe 's method of separation of nobles gas mixture from air, ................... is used:

asked Nov 8, 2013 by meena.p

0 answers

Which one of the following is true for an exothermic reaction $ A \rightleftharpoons B$ if $E_{r}\: and \: E_b$ are the activation energies of forward and backward reactions respectively?

asked Nov 5, 2013 by thanvigandhi_1

1 answer

The number of unit cells present in 39 grams of potassium if its crystallizes as body centred cube is : ( N = Avogadro number , At.wt of potassium =39)

asked Nov 5, 2013 by thanvigandhi_1

1 answer

If the values of $\land_{\infty}$ of $ NH_4CI,NaOH\: and \: NaCI$ are 130, 217 and 109 $ohm^{-1}\: .\: cm^2\: .\: equiv^{-1}$ respectively, the $ \land_{\infty}$ of $NH_4OH$ in $ ohm^{-1}\: .\: cm^2\: .\: equiv^{-1}$ is :

asked Nov 5, 2013 by thanvigandhi_1

1 answer

Match the following

asked Nov 5, 2013 by thanvigandhi_1

1 answer

The volume in ml. of 0.1 M solution of NaOH required to completely neutralize 100 ml. of 0.3 M solution of $H_3PO_3$ is :

asked Nov 5, 2013 by thanvigandhi_1

1 answer

Which one of the following is an artificial sweetening agent ?

asked Nov 5, 2013 by thanvigandhi_1

1 answer

Which one of the following statement is not correct?

asked Nov 5, 2013 by thanvigandhi_1

1 answer

Which one of the following is not a biopolymer?

asked Nov 5, 2013 by thanvigandhi_1

1 answer

Nitrobenzene on reduction using Zinc in alkaline medium results in 'X'. The number of sigma $ ( \sigma)$ and pi $ \pi$ bonds in 'X' is :

asked Nov 5, 2013 by thanvigandhi_1

1 answer

The $pK_q$ values of four carboxylic acid are 4.76, 4.19, 0.23 and 3.41 respectively. The $pK_a$ value of strongest carboxylic acid among them is :

asked Nov 5, 2013 by thanvigandhi_1

1 answer

The reagent used in the Wolff - Kishner reduction is :

asked Nov 5, 2013 by thanvigandhi_1

1 answer

The order of reactivity of Phenol (1), Nitrobenzene (2) and Benzene (3) towards nitration is :

asked Nov 5, 2013 by thanvigandhi_1

1 answer

Phosgene is formed slowly from which one of the following on exposure to air and sunlight?

asked Nov 5, 2013 by thanvigandhi_1

1 answer

Which one of the following exhibits enantiomerism ?

asked Nov 5, 2013 by thanvigandhi_1

0 answers

The number of sigma and pi $(\pi)$ bonds presents in benzene respectively are :

asked Nov 5, 2013 by meena.p

1 answer

$CH_3CH_2OH \longrightarrow CH_3CHO \longrightarrow Cl_3CCHO $ In above reactions the role of $Cl_2$ in step -I and Step-2 respectively is :

asked Nov 5, 2013 by meena.p

1 answer

Which of the following reactions does not liberate gaseous product?

asked Nov 5, 2013 by meena.p

0 answers

Eithyl chloride reacts with sodium ethoxide to form a compound A. Which of the following reactions also yields A?

asked Nov 5, 2013 by meena.p

1 answer

What are the metal ions present in carnallite?

asked Nov 5, 2013 by meena.p

1 answer

$C_6H+6+O_3 \longrightarrow \: \: \: X \: \: \: \underrightarrow{Zn/H_2O} \: \: \: Y$

asked Nov 4, 2013 by thanvigandhi_1

1 answer

Hydrolysis of $NCl_3$, gives $NH_3$ and X. Which of the following is X?

asked Oct 30, 2013 by meena.p

1 answer

When compound X is oxidised by acidified potassium dichromate, compound Y id formed. Compound Y on reduction with $LiA | H_4$ gives X.X and Y respectively are :

asked Oct 30, 2013 by meena.p

1 answer

Assertion (A) : A current of 96.5 A is passed into aqueous $AgNO_3$ solution for 100 s. The weight of silver deposited is $10.8\;g$ (At . wt. of Ag=108). Reason (R): The mass of a substance deposited during the electrolysis of an electrolyte is inversely proportional to the quantity of electricity passing through the electrolyte.

asked Oct 30, 2013 by meena.p

1 answer

Which of the following reacts with benzene in presence of anhydrous aluminium chloride and forms acetophenone ?

asked Oct 30, 2013 by meena.p

1 answer

Identify the reaction for which $\Delta H= \Delta E$

asked Oct 30, 2013 by meena.p

1 answer

Which of the following compounds when heated with $CO$ at $150^{\circ}C$ and 500 atm pressure in presence of $BF_3$ forms ethyl propionate?

asked Oct 30, 2013 by meena.p

1 answer

Observe the following statements:

asked Oct 30, 2013 by meena.p

1 answer

What is the correct order of occurrence (% by weight) in air of Ne, Ar and Kr?

asked Oct 30, 2013 by meena.p

1 answer

Match the following lists:

asked Oct 30, 2013 by meena.p

1 answer

The volume - temperature graphs of a given mass of an ideal gas at constant pressures are shown below. What is the correct order of pressures?

asked Oct 30, 2013 by meena.p

1 answer

when acetaldehyde is heated with Fehling solution, a red precipitate is formed. Which of the following is that?

asked Oct 30, 2013 by meena.p

1 answer

Which of the following is not correct ?

asked Oct 30, 2013 by meena.p

1 answer

Which of the products is formed when acetone is reacted with barium hydroxide solution ?

asked Oct 30, 2013 by meena.p

1 answer

At $T(K) , 100 L$ of dry oxygen is present in a sealed container. It is subjected to silent electric discharge , till the volumes of oxygen and ozone become equal. What is the volume (in liters) of ozone formed at $T(k)$?

asked Oct 30, 2013 by meena.p

1 answer

Which of the following is added to chloroform to slow down its aerial oxidation in presence of light?

asked Oct 30, 2013 by meena.p

1 answer

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