NTA JEE Main 11th April 2014 Online - Chemistry

NTA JEE Main 11th April 2014 Online - Chemistry - Question 31

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A gaseous compound of nitrogen and hydrogen contains 12.5% (by mass) of hydrogen. The density of the compound relative to hydrogen is 16. The molecular formula of the compound is:

A

NH$$_2$$

B

N$$_3$$H

C

NH$$_3$$

D

N$$_2$$H$$_4$$

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NTA JEE Main 11th April 2014 Online - Chemistry - Question 32

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If $$\lambda_0$$ and $$\lambda$$ be threshold wavelength and wavelength of incident light, the velocity of photoelectron ejected from the metal surface is:

A

$$\sqrt{\frac{2h}{m}(\lambda_0 - \lambda)}$$

B

$$\sqrt{\frac{2hc}{m}(\lambda_0 - \lambda)}$$

C

$$\sqrt{\frac{2hc}{m}\left(\frac{\lambda_0 - \lambda}{\lambda \lambda_0}\right)}$$

D

$$\sqrt{\frac{2h}{m}\left(\frac{1}{\lambda_0} - \frac{1}{\lambda}\right)}$$

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NTA JEE Main 11th April 2014 Online - Chemistry - Question 33

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Based on the equation: $$\Delta E = -2.0 \times 10^{-18}$$ J $$\left(\frac{1}{n_2^2} - \frac{1}{n_1^2}\right)$$, the wavelength of the light that must be absorbed to excite hydrogen electron from level n = 1 to level n = 2 will be: (h = $$6.625 \times 10^{-34}$$ Js, C = $$3 \times 10^8$$ ms$$^{-1}$$)

A

$$1.325 \times 10^{-7}$$ m

B

$$1.325 \times 10^{-10}$$ m

C

$$2.650 \times 10^{-7}$$ m

D

$$5.300 \times 10^{-10}$$ m

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NTA JEE Main 11th April 2014 Online - Chemistry - Question 34

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Which of the following series correctly represents relations between the elements from X to Y? X → Y

A

$$_3$$Li → $$_{19}$$K Ionization enthalpy increases

B

$$_9$$F → $$_{35}$$Br Electron gain enthalpy (negative sign) increases

C

$$_6$$C → $$_{32}$$Ge Atomic radii increases

D

$$_{18}$$Ar → $$_{54}$$Xe Noble character increases

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NTA JEE Main 11th April 2014 Online - Chemistry - Question 35

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The correct order of bond dissociation energy among N$$_2$$, O$$_2$$, O$$_2^-$$ is shown in which of the following arrangements?

A

N$$_2$$ > O$$_2^-$$ > O$$_2$$

B

O$$_2^-$$ > O$$_2$$ > N$$_2$$

C

N$$_2$$ > O$$_2$$ > O$$_2^-$$

D

O$$_2$$ > O$$_2^-$$ > N$$_2$$

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NTA JEE Main 11th April 2014 Online - Chemistry - Question 36

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Which one of the following does not have a pyramidal shape?

A

(CH$$_3$$)$$_3$$ N

B

(SiH$$_3$$)$$_3$$ N

C

P(CH$$_3$$)$$_3$$

D

P(SiH$$_3$$)$$_3$$

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NTA JEE Main 11th April 2014 Online - Chemistry - Question 37

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In allene (C$$_3$$H$$_4$$), the type(s) of hybridization of the carbon atoms is (are):

A

sp and sp$$^3$$

B

sp$$^2$$ and sp

C

only sp$$^2$$

D

sp$$^2$$ and sp$$^3$$

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NTA JEE Main 11th April 2014 Online - Chemistry - Question 38

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The initial volume of a gas cylinder is 750.0 mL. If the pressure of gas inside the cylinder changes from 840.0 mmHg to 360.0 mmHg, the final volume the gas will be:

A

1.750 L

B

3.60 L

C

4.032 L

D

7.50 L

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NTA JEE Main 11th April 2014 Online - Chemistry - Question 39

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The molar heat capacity (C$$_p$$) of CD$$_2$$O is 10 cals at 1000 K. The change of entropy associated with cooling of 32 g of CD$$_2$$O vapour from 1000 K to 100 K at constant pressure will be: (D = deuterium, atomic mass = 2u)

A

23.03 cal deg$$^{-1}$$

B

$$-23.03$$ cal deg$$^{-1}$$

C

2.303 cal deg$$^{-1}$$

D

$$-2.303$$ cal deg$$^{-1}$$

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NTA JEE Main 11th April 2014 Online - Chemistry - Question 40

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Consider the following equilibrium:
$$AgCl \downarrow + 2NH_3 \rightleftharpoons [Ag(NH_3)_2]^+ + Cl^-$$
White precipitate of AgCl appears on adding which of the following?

A

NH$$_3$$

B

aqueous NaCl

C

aqueous HNO$$_3$$

D

aqueous NH$$_4$$Cl

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NTA JEE Main 11th April 2014 Online - Chemistry - Question 41

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Assuming that the degree of hydrolysis is small, the pH of 0.1M solution of sodium acetate (K$$_a$$ = $$1.0 \times 10^{-5}$$) will be:

A

5.0

B

6.0

C

8.0

D

9.0

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NTA JEE Main 11th April 2014 Online - Chemistry - Question 42

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Which of the following statements about Na$$_2$$O$$_2$$ is not correct?

A

It is diamagnetic in nature

B

It is derivative of H$$_2$$O$$_2$$

C

Na$$_2$$O$$_2$$ oxidises Cr$$^{3+}$$ to CrO$$_4^{2-}$$ in acid medium

D

It is the super oxide of sodium

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NTA JEE Main 11th April 2014 Online - Chemistry - Question 43

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The reagent needed for converting:

A

Cat. Hydrogenation

B

H$$_2$$/Lindlar Cat.

C

Li/NH$$_3$$

D

LiAlH$$_4$$

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NTA JEE Main 11th April 2014 Online - Chemistry - Question 44

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The gas liberated by the electrolysis of Dipotassium succinate solution is:

A

Ethane

B

Ethyne

C

Ethene

D

Propene

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NTA JEE Main 11th April 2014 Online - Chemistry - Question 45

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Which of the following statements about the depletion of ozone layer is correct?

A

The problem of ozone depletion is less serious at poles because NO$$_2$$ solidifies and is not available for consuming ClO• radicals.

B

The problem of ozone depletion is more serious at poles because ice crystals in the clouds over poles act as catalyst for photochemical reactions involving the decomposition of ozone of Cl• and ClO• radicals.

C

Freons, chlorofluorocarbons, are inert. Chemically, they do not react with ozone in stratosphere.

D

Oxides of nitrogen also do not react with ozone in stratosphere.

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NTA JEE Main 11th April 2014 Online - Chemistry - Question 46

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The appearance of colour in solid alkali metal halides is generally due to:

A

Schottky defect

B

Frenkel defect

C

Interstitial position

D

F-centres

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NTA JEE Main 11th April 2014 Online - Chemistry - Question 47

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In some solutions, the concentration of H$$_3$$O$$^+$$ remains constant even when small amounts of strong acid or strong base are added to them. These solutions are known as:

A

Ideal solutions

B

Colloidal solutions

C

True solutions

D

Buffer solutions

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NTA JEE Main 11th April 2014 Online - Chemistry - Question 48

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Given:
Fe$$^{3+}$$(aq) + e$$^-$$ → Fe$$^{2+}$$(aq); E$$^0$$ = +0.77 V
Al$$^{3+}$$(aq) + 3e$$^-$$ → Al(s); E$$^0$$ = $$-1.66$$ V
Br$$_2$$(aq) + 2e$$^-$$ → 2Br$$^-$$; E$$^0$$ = +1.09 V
Considering the electrode potentials, which of the following represents the correct order of reducing power?

A

Fe$$^{2+}$$ < Al < Br$$^-$$

B

Br$$^-$$ < Fe$$^{2+}$$ < Al

C

Al < Br$$^-$$ < Fe$$^{2+}$$

D

Al < Fe$$^{2+}$$ < Br$$^-$$

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NTA JEE Main 11th April 2014 Online - Chemistry - Question 49

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In the reaction of formation of sulphur trioxide by contact process $$2SO_2 + O_2 \rightleftharpoons 2SO_3$$ the rate of reaction was measured as $$\frac{d[O_2]}{dt} = -2.5 \times 10^{-4}$$ mol L$$^{-1}$$ s$$^{-1}$$. The rate of reaction in terms of [SO$$_2$$] in mol L$$^{-1}$$ s$$^{-1}$$ will be:

A

$$-1.25 \times 10^{-4}$$

B

$$-2.50 \times 10^{-4}$$

C

$$-3.75 \times 10^{-4}$$

D

$$-5.00 \times 10^{-4}$$

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NTA JEE Main 11th April 2014 Online - Chemistry - Question 50

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For the reaction, $$2N_2O_5 \to 4NO_2 + O_2$$, the rate equation can be expressed in two ways:
$$-\frac{d[N_2O_5]}{dt} = k[N_2O_5]$$ and $$+\frac{d[NO_2]}{dt} = k'[N_2O_5]$$. k and k' are related as:

A

k = k'

B

2k = k'

C

k = 2k'

D

k = 4k'

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NTA JEE Main 11th April 2014 Online - Chemistry - Question 51

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Shapes of certain interhalogen compounds are stated below. Which one of them is not correctly stated?

A

IF$$_7$$: pentagonal bipyramid

B

BrF$$_5$$: trigonal bipyramid

C

BrF$$_3$$: planar T-shaped

D

ICl$$_3$$: planar dimeric

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NTA JEE Main 11th April 2014 Online - Chemistry - Question 52

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Which of the following name formula combinations is not correct?

A

K$$_2$$[Pt(CN)$$_4$$] - Potassium tetracyanoplatinate (II)

B

[Mn(CN)$$_5$$]$$^{2-}$$ - Pentacyanomangonate (II) ion

C

K[Cr(NH$$_3$$)$$_2$$Cl$$_4$$] - Potassium diammine tetrachlorochromate (III)

D

[Co(NH$$_3$$)$$_4$$(H$$_2$$O)I]SO$$_4$$ - Tetraammine aquaiodo cobalt (III) sulphate

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NTA JEE Main 11th April 2014 Online - Chemistry - Question 53

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Consider the coordination compound, [Co(NH$$_3$$)$$_6$$]Cl$$_3$$. In the formation of this complex, the species which acts as the Lewis acid is:

A

[Co(NH$$_3$$)$$_6$$]$$^{3+}$$

B

Cl$$^-$$

C

Co$$^{3+}$$

D

NH$$_3$$

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NTA JEE Main 11th April 2014 Online - Chemistry - Question 54

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Chlorobenzene reacts with trichloro acetaldehyde in the presence of H$$_2$$SO$$_4$$. The major product formed is:

A

B

C

D

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NTA JEE Main 11th April 2014 Online - Chemistry - Question 55

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Tischenko reaction is a modification of:

A

Aldol condensation

B

Claisen condensation

C

Cannizzaro reaction

D

Pinacol-pinacolon reaction

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NTA JEE Main 11th April 2014 Online - Chemistry - Question 56

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Which one of the following statements is not correct?

A

Alcohols are weaker acids than water

B

Acid strength of alcohols decreases in the following order: RCH$$_2$$OH > R$$_2$$CHOH > R$$_3$$COH

C

Carbon-oxygen bond length in methanol, CH$$_3$$OH is shorter than that of C-O bond length in phenol.

D

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NTA JEE Main 11th April 2014 Online - Chemistry - Question 57

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The following reaction is known as:

A

Perkin reaction

B

Gatterman-Koch Formylation

C

Kolbe's reaction

D

Gattermann reaction

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NTA JEE Main 11th April 2014 Online - Chemistry - Question 58

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An organic compound A, C$$_5$$H$$_8$$O; reacts with H$$_2$$O, NH$$_3$$ and CH$$_3$$COOH as described below:

A

B

C

D

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NTA JEE Main 11th April 2014 Online - Chemistry - Question 59

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Complete reduction of benzene-diazonium chloride with Zn/HCl gives:

A

Aniline

B

Phenylhydrazine

C

Azobenzene

D

Hydrazobenzene

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NTA JEE Main 11th April 2014 Online - Chemistry - Question 60

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Which one of the following is used as Antihistamine?

A

Omeprazole

B

Chloranphenicol

C

Diphenhydramine

D

Norethindrone

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