NTA JEE Main 12th April 2014 Online - Chemistry

NTA JEE Main 12th April 2014 Online - Chemistry - Question 31

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The amount of BaSO$$_4$$ formed upon mixing 100 mL of 20.8% BaCl$$_2$$ solution with 50 mL of 9.8% H$$_2$$SO$$_4$$ solution will be: (Ba = 137, Cl = 35.5, S = 32, H = 1 and O = 16)

A

23.3 g

B

11.65 g

C

30.6 g

D

33.2 g

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NTA JEE Main 12th April 2014 Online - Chemistry - Question 32

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If $$m$$ and $$e$$ are the mass and charge of the revolving electron in the orbit of radius $$r$$ for hydrogen atom, the total energy of the revolving electron will be:

A

$$\frac{1}{2}\frac{e^2}{r}$$

B

$$-\frac{e^2}{r}$$

C

$$\frac{me^2}{r}$$

D

$$-\frac{1}{2}\frac{e^2}{r}$$

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NTA JEE Main 12th April 2014 Online - Chemistry - Question 33

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The de-Broglie wavelength of a particle of mass 6.63 g moving with a velocity of 100 ms$$^{-1}$$ is:

A

$$10^{-33}$$ m

B

$$10^{-35}$$ m

C

$$10^{-31}$$ m

D

$$10^{-25}$$ m

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NTA JEE Main 12th April 2014 Online - Chemistry - Question 34

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Excited hydrogen atom emits light in the ultraviolet region at $$2.47 \times 10^{15}$$ Hz. With this frequency, the energy of a single photon is: (h = $$6.63 \times 10^{-34}$$ Js)

A

$$8.041 \times 10^{-40}$$ J

B

$$2.680 \times 10^{-19}$$ J

C

$$1.640 \times 10^{-18}$$ J

D

$$6.111 \times 10^{-17}$$ J

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NTA JEE Main 12th April 2014 Online - Chemistry - Question 35

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Similarity in chemical properties of the atoms of elements in a group of the Periodic table is most closely related to:

A

atomic numbers

B

atomic masses

C

number of principal energy levels

D

number of valence electrons

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NTA JEE Main 12th April 2014 Online - Chemistry - Question 36

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Which of the following arrangements represents the increasing order (smallest to largest) of ionic radii of the given species O$$^{2-}$$, S$$^{2-}$$, N$$^{3-}$$, P$$^{3-}$$?

A

O$$^{2-}$$ < N$$^{3-}$$ < S$$^{2-}$$ < P$$^{3-}$$

B

O$$^{2-}$$ < P$$^{3-}$$ < N$$^{3-}$$ < S$$^{2-}$$

C

N$$^3$$ < O$$^{2-}$$ < P$$^{3-}$$ < S$$^{2-}$$

D

N$$^{3-}$$ < S$$^{2-}$$ < O$$^{2-}$$ < P$$^{3-}$$

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NTA JEE Main 12th April 2014 Online - Chemistry - Question 37

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Which of the following molecules has two sigma ($$\sigma$$) and two pi ($$\pi$$) bonds?

A

C$$_2$$H$$_4$$

B

N$$_2$$ F$$_2$$

C

C$$_2$$H$$_2$$Cl$$_2$$

D

HCN

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NTA JEE Main 12th April 2014 Online - Chemistry - Question 38

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The (S°) of the following substances are: CH$$_4$$(g) 186.2 JK$$^{-1}$$ mol$$^{-1}$$, O$$_2$$(g) 205.2 JK$$^{-1}$$ mol$$^{-1}$$, CO$$_2$$(g) 213.6 JK$$^{-1}$$ mol$$^{-1}$$, H$$_2$$O(g) 69.9 JK$$^{-1}$$ mol$$^{-1}$$. The entropy change ($$\Delta S^\circ$$) for the reaction CH$$_4$$(g) + 2O$$_2$$(g) → CO$$_2$$(g) + 2H$$_2$$O(l) is:

A

$$-312.5$$ J K$$^{-1}$$ mol$$^{-1}$$

B

$$-242.8$$ JK$$^{-1}$$ mol$$^{-1}$$

C

$$-108.1$$ JK$$^{-1}$$ mol$$^{-1}$$

D

$$-37.6$$ J K$$^{-1}$$ mol$$^{-1}$$

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NTA JEE Main 12th April 2014 Online - Chemistry - Question 39

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The standard enthalpy of formation ($$\Delta_fH^\circ_{298}$$) for methane, CH$$_4$$ is $$-74.9$$ kJ mol$$^{-1}$$. In order to calculate the average energy given out in the formation of a C-H bond from this it is necessary to know which one of the following?

A

The dissociation energy of the hydrogen molecule, H$$_2$$.

B

The first four ionisation energies of carbon.

C

The dissociation energy of H$$_2$$ and enthalpy and sublimation of carbon (graphite).

D

The first four ionisation energies of carbon and electron affinity of hydrogen.

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NTA JEE Main 12th April 2014 Online - Chemistry - Question 40

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What happens when an inert gas is added to an equilibrium keeping volume unchanged?

A

More product will form

B

Less product will form

C

More reactant will form

D

Equilibrium will remain unchanged

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NTA JEE Main 12th April 2014 Online - Chemistry - Question 41

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The conjugate base of hydrazoic acid is:

A

N$$^{-3}$$

B

N$$_3^-$$

C

N$$_2^-$$

D

HN$$_3^-$$

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NTA JEE Main 12th April 2014 Online - Chemistry - Question 42

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Hydrogen peroxide acts both as an oxidising and as a reducing agent depending upon the nature of the reacting species. In which of the following cases H$$_2$$O$$_2$$ acts as a reducing agent in acid medium?

A

MnO$$_4^-$$

B

Cr$$_2$$O$$_7^{2-}$$

C

SO$$_3^{2-}$$

D

KI

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NTA JEE Main 12th April 2014 Online - Chemistry - Question 43

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Which one of the following acids does not exhibit optical isomerism?

A

Lactic acid

B

Tartaric acid

C

Maleic acid

D

$$\alpha$$-amino acids

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NTA JEE Main 12th April 2014 Online - Chemistry - Question 44

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 on mercuration-demercuration produces the major product:

A

B

C

D

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NTA JEE Main 12th April 2014 Online - Chemistry - Question 45

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In the presence of peroxide, HCl and HI do not give anti-Markownikoff's addition of alkenes because:

A

One of the steps is endothermic in HCl and HI

B

Both HCl and HI are strong acids

C

HCl is oxidizing and the HI is reducing

D

All the steps are exothermic is HCl and HI

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NTA JEE Main 12th April 2014 Online - Chemistry - Question 46

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Global warming is due to increase of:

A

methane and nitrous oxide in atmosphere

B

methane and CO$$_2$$ in atmosphere

C

methane and O$$_3$$ in atmosphere

D

methane and CO in atmosphere

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NTA JEE Main 12th April 2014 Online - Chemistry - Question 47

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In a monoclinic unit cell, the relation of sides and angles are respectively:

A

a = b $$\neq$$ c and $$\alpha = \beta = \gamma = 90$$°

B

a $$\neq$$ b $$\neq$$ c and $$\alpha = \beta = \gamma = 90$$°

C

a $$\neq$$ b $$\neq$$ c and $$\beta = \gamma = 90$$° $$\neq \alpha$$

D

a $$\neq$$ b $$\neq$$ c and $$\alpha \neq \beta \neq \gamma \neq 90$$°

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NTA JEE Main 12th April 2014 Online - Chemistry - Question 48

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How many electrons would be required to deposit 6.35 g of copper at the cathode during the electrolysis of an aqueous solution of copper sulphate? (Atomic mass of copper = 63.5u, N$$_A$$ = Avogadro's constant):

A

$$\frac{N_A}{20}$$

B

$$\frac{N_A}{10}$$

C

$$\frac{N_A}{5}$$

D

$$\frac{N_A}{2}$$

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NTA JEE Main 12th April 2014 Online - Chemistry - Question 49

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The rate coefficient (k) for a particular reactions is $$1.3 \times 10^{-4}$$ M$$^{-1}$$ s$$^{-1}$$ at 100°C, and $$1.3 \times 10^{-3}$$ M$$^{-1}$$ s$$^{-1}$$ at 150°C. What is the energy of activation (E$$_A$$) (in kJ) for this reaction? (R = molar gas constant = 8.314 JK$$^{-1}$$ mol$$^{-1}$$)

A

16

B

60

C

99

D

132

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NTA JEE Main 12th April 2014 Online - Chemistry - Question 50

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Which of the following xenon-oxo compounds may not be obtained by hydrolysis of xenon fluorides?

A

XeO$$_2$$F$$_2$$

B

XeOF$$_4$$

C

XeO$$_3$$

D

XeO$$_4$$

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NTA JEE Main 12th April 2014 Online - Chemistry - Question 51

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

A

Ti(22)

B

V(23)

C

Cr(24)

D

Mn(25)

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NTA JEE Main 12th April 2014 Online - Chemistry - Question 52

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

A

the formation of a layer of cupric oxide on the surface of copper.

B

the formation of a layer of basic carbonate of copper on the surface of copper.

C

the formation of a layer of cupric hydroxide on the surface of copper.

D

the formation of basic copper sulphate layer on the surface of the metal.

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NTA JEE Main 12th April 2014 Online - Chemistry - Question 53

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Among the following species the one which causes the highest CFSE, $$\Delta_0$$ as a ligand is:

A

CN$$^-$$

B

NH$$_3$$

C

F$$^-$$

D

CO

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NTA JEE Main 12th April 2014 Online - Chemistry - Question 54

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Which one of the following complexes will most likely absorb visible light? (At. nos. Sc = 21, Ti = 22, V = 23, Zn = 30)

A

[Sc(H$$_2$$O)$$_6$$]$$^{3+}$$

B

[Ti(NH$$_3$$)$$_6$$]$$^{4+}$$

C

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

D

[Zn(NH$$_3$$)$$_6$$]$$^{2+}$$

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NTA JEE Main 12th April 2014 Online - Chemistry - Question 55

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Conversion of benzene diazonium chloride to chlorobenzene is an example of which of the following reactions?

A

Claisen

B

Friedel-craft

C

Sandmeyer

D

Wurtz

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NTA JEE Main 12th April 2014 Online - Chemistry - Question 56

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The major product obtained in the photo catalysed bromination of 2-methylbutane is:

A

1-bromo-2-methylbutane

B

1-bromo-3-methylbutane

C

2-bromo-3-methylbutane

D

2-bromo-2-methylbutane

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NTA JEE Main 12th April 2014 Online - Chemistry - Question 57

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In the Victor-Meyer's test, the colour given by 1°, 2° and 3° alcohols are respectively:

A

Red, colourless, blue

B

Red, blue, colourless

C

Colourless, red, blue

D

Red, blue, violet

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NTA JEE Main 12th April 2014 Online - Chemistry - Question 58

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Phthalic acid reacts with resorcinol in the presence of concentrated H$$_2$$SO$$_4$$ to give:

A

Phenolphthalein

B

Alizarin

C

Coumarin

D

Fluorescein

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NTA JEE Main 12th April 2014 Online - Chemistry - Question 59

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Aminoglycosides are usually used as:

A

antibiotic

B

analgesic

C

hypnotic

D

antifertility

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NTA JEE Main 12th April 2014 Online - Chemistry - Question 60

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Which of the following will not show mutarotation?

A

Maltose

B

Lactose

C

Glucose

D

Sucrose

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