On moving from left to right across a period in the periodic table, the metallic character__________.

1. increases

2. decreases

3. remains constant

4. first increases and then decreases

Presence of which cation makes the water hard in nature?

1. Ca& Mg

2. Na&Mg

3. Ca&Na

4. Mg&F

Which of the following species does not acts as a nucleophile?

 

1. ROH

2. ROR

3. PCl₃

4. BF₃

Which one of the following is used to study the movements of ground water?

1. Deuterium

2. Protium

3. Tritium

4. HD

The most electro positive element of the periodic table is _________

1. Gold

2. Platinum

3. Cesium

4. Calcium

Given that C_(g)+ O_2(g) ⟶ CO_2(g)ΔH^o =-akJ;2CO_(g)+O_2(g) ⟶ 2CO_2(g)ΔH^o=-bkJ; Calculate the AHo for the reaction C_(g)+ 1/2O_2(g) ⟶ CO_(g)

1. \(\frac{b+2a}{2}\)

2. 2a-b

3. \(\frac{2a-b}{2}\)

4. \(\frac{b-2a}{2}\)

The reaction H₃PO₂ + D₂O ➝ H₂DPO₂ + HDO indicates that hypo-phosphorus acid is

1. tribasic acid

2. dibasic acid

3. mono basic acid

4. none of these

Hydrogen accepts an electron to attain the inert gas configuration. In this way it resembles __________

1. chalcogens

2. halogens

3. transition metals

4. alkali metals

Identify A and B.

Match the list I with List II and select the correct answer using. the code given below the lists.

List I		List II
A	Metalloid	1	Cerium
B	Noble gas	2	Nobelium
C	Trans uranium element	3	Arsenic
D	Lanthanide	4	Argon

1. A	B	C	D
   1	3	2	4

2. A	B	C	D
   4	2	1	3

3. A	B	C	D
   3	4	2	1

4. A	B	C	D
   2	1	4	3

The correct sequence of increasing covalent character is

 

1. LiCl < NaCl 2

2. NaCl < LiCl < BeCl₂

3. BeCl₂

There are _____ periods in the periodic table.

1. 18

2. 7

3. 6

4. 5

Purification of two miscible .liqulds possessing very close boiling points can be separated using-

 

1. Fractional distillation

2. Sublimation

3. Simple distillation

4. Steam distillation

Assertion: Critical temperature of CO₂ is 304K, it can be liquefied above 304K.
Reason : For a given mass of gas, volume is to directly proportional to pressure at constant temperature

1. both assertion and reason are true and reason is the correct explanation of assertion

2. both assertion and reason are true but reason is not the correct explanation of assertion

3. assertion is true but reason is false

4. both assertion and reason are false

In which of the following geometrical isomerism is possible?

 

1. CH₃CH = C(CH₃)₂

2. C₆H₅N = NC₆H₅

3. CH₃CH = CH₂

4. All of these

Which of the following does not represent the mathematical expression for the Heisenberg uncertainty principle?

1. \(\triangle x.\triangle p\ge \frac { h }{ 4\pi } \)

2. \(\triangle x.\triangle v\ge \frac { h }{ 4\pi m } \)

3. \(\triangle E.\triangle t\ge \frac { h }{ 4\pi } \)

4. \(\triangle E.\triangle x\ge \frac { h }{ 4\pi } \)

One mole of Sulphuric acid contains _______oxygen atoms

1. 4 x 10²³

2. 4 x 6.023 x 10^-23

3. 4 x 6.023 x 10²³

4. 4 x 6.023 x 10³²

H₂O is polar, whereas BeF₂ is not It is because

 

1. The electronegativity of F is greater than that of O.

2. H₂O involves hydrogen bonding whereas BeF₂ is a discrete molecule

3. H₂O is linear and BeF₂ is angular

4. H₂O is angular and BeF₂ is linear

Correctly match the list-I and list-II using the code given below the list

List-I		List-II
A	Chlorophyll	1	Plaster of paris
B	Bones	2	Gypsum
C	Dentistry	3	Magnesium
D	Cement	4	Calcium

1. A	B	C	D
   1	3	2	4

2. A	B	C	D
   2	4	3	1

3. A	B	C	D
   3	4	1	2

4. A	B	C	D
   4	1	2	3

The number of groups in the periodic table is

1. 7

2. 18

3. 5

4. 6

Assertion : Lithium is in diagonal relationship with magnesium
Reason : Li⁺ has same size as Mg²

1. Both assertion and reason are true and reason is the correct explanation for assertion.

2. Both assertion and reason are true but reason is not the correct explanation for assertion

3. Assertion is true but reason are false

4. Both assertion and reason are false.

Which of the following is correct order of the stability of carbocations?

1. ⁺CH₃>⁺CH₂ CH₃> ⁺CH(CH₃)₂ >⁺C(CH₃)₃

2. ⁺CH₂CH₃>⁺CH₃>⁺CH(CH₃)₂>⁺C(CH₃)₃

3. ⁺C(CH₃)₃>⁺CH(CH₃)₂>⁺CH₂CH₃>⁺CH₃

4. ⁺CH(CH₃)₂>⁺CH₃>⁺CH₂CH₃>⁺C(CH₃)₃

Which of the following mixture of gases is called water gas?

1. CO_2(g)+ H_2(g)

2. CO_(g)+ N_2(g)

3. CO_(g)+ H_2(g)

4. N_2(g)+ H_2(g)

The SI unit of heat is--------

1. Joule

2. Calorie

3. mole

4. J mol^-1

Electron density in the yz plane of 3d_x^y-y² orbital is

1. zero

2.  0.50

3. 0.75

4.  0.90

Which one of the following is used as a standard for atomic mass.

1. ₆C¹²

2. ₇C¹²

3. ₆C¹³

4. ₆C¹⁴

Liquid hydrogen is used as -------------

1. a rocket fuel as well as in space research

2. fuel cells for generating electrical energy

3. cutting and welding torch

4. desiccant to remove moisture from organic solvent

Ionic hydrides are formed by

1. halogens

2. chalogens

3. inert gases

4. group one elements

Which one of the following is the correct increasing order of bond angle?

1. H₂O<CH₄<BF₃<BeCl₂

2. BeCl₂<BF₃<CH₄<H₂O

3. BF₃<CH₄<BeCl₂<H₂O

4. CH₄<BeCl₂<H₂O<BF₃

Which of the following ions are more responsible for transmission of nerve signal?

1. Li⁺

2. RB⁺

3. Cs⁺

4. K⁺

What would be the formula of the compound formed by A and B, where A has the valence 3 and B has the valence 3?

1. AB

2. AB₃

3. A₃B

4. 3AB₃

Match species given in List-I with the electronic configuration of list-II.

List-I		List-II
A	Cr	1	[Ar]3d84s0
B	Fe2+	2	[Ar]3d104s1
C	Ni2+	3	[Ar]3d64s0
D	Cu	4	[Ar]3d64s1

1. A	B	C	D
   3	4	2	1

2. A	B	C	D
   4	3	2	1

3. A	B	C	D
   4	3	1	2

4. A	B	C	D
   3	4	1	2

2H_2(g) +CO_2(g) CH₃0H_(g)' \(\Delta \)H =-92.2 kJ Which of the following condition will shift the equilibrium in the forward direction?

 

1. Temperature of the system is increased

2. CO is removed

3. CH₃OH is added

4. The pressure of the system is increased

Match the List-I and List-Il using the correct code given below the list.

List-I	List-II
A. Critical Volume	1. \(a\over 27b^2\)
B. Critical Pressure	2. \(2a\over Rb\)
C. Critical Temperature	3. 3b
D. Inversion Temperature	4. \(8a\over 27Rb\)

1. A	B	C	D
   3	1	4	2

2. A	B	C	D
   4	2	1	3

3. A	B	C	D
   2	4	3	1

4. A	B	C	D
   1	3	2	4

Plaster of Paris is______

1. CaSO₄.H₂O

2. CaSO₄.1/2H₂O

3. CaSO₄.1/4H₂O

4. CaSO₄.2H₂O

In which of the following, the group attached to the benzene ring shows +R effect?

1. All of these

The de-Broglie wavelength of a particle with mass 19and velocity 100 m/s is

1. 6.63 \(\times\) 10^-35 m

2. 6.63 \(\times\) 10^-34 m

3. 6.63 \(\times\) 10^-33 m

4. 6.65 \(\times\) 10^-35 m

When zeolite is treated with hard water, the sodium ions are exchanged with------

1. H⁺ ions and Cl^- ions

2. Ca²⁺ ions

3. Cl^- ions

4. Ca²⁺ ions and Mg²⁺ ions

For the reaction 
\({ CH }_{ 4\left( g \right) }+2O_{ 2\left( g \right) }\rightleftharpoons { CO }_{ 2\left( g \right) }+2{ H }_{ 2 }O_{ \left( l \right) }\) \(\Delta H\) =-170.8 KJ mol^-1 which of the followingstatement  is not true?

 

1. At equilibrium, the concentration of CO_2(g) and H₂0_(l) are not equal

2. The equilibrium constant for the reaction is given by \({ K }_{ p }=\cfrac { \left[ { CO }_{ 2 } \right] }{ \left[ { CH }_{ 4 } \right] \left[ { O }_{ 2 } \right] } \)

3. Addition of CH_4(g) or 0_2(g) at equilibrium will cause a shift to the right

4. The reaction is exothermic.

Which of the following does not alter the equilibrium?

1. catalyst

2. concentration

3. temperature

4. pressure

In the system;\(Fe\left( OH \right) _{ 3\left( s \right) }\rightleftharpoons { Fe }_{ \left( aq \right) }^{ 3+ }+{ 3OH }_{ \left( aq \right) }\) decreasing the conc. of OH^-ions \(\cfrac { 1 }{ 3 } ^{ - }\)times will cause the equilibrium cone, of Fe³⁺ to increase .... times

1. 27

2. 9

3. 18

4. 3

The first ionisation energies of alkaline earth metals are higher than alkali metals. This is because:

1. there is increase in nuclear charge of the alkaline earth metals

2. there is decrease in nuclear charge of the alkaline earth metals.

3. there is no charge in nuclear charge

4. none of these

The best and latest technique for isolation, purification and separation of organic compounds is

 

1. Crystallisation

2. Distillation

3. Sublimation

4. Chromatography

Pick out the pollutant(s) that causes eye irritation

 

1. CO₂

2. NO₂

3. SO₂

4. All of these

The most common oxidation state of alkaline earth metals is ________

1. +4

2. +2

3. +1

4. +3

The hybridisation of oxygen atom is H₂O and H₂O₂ are, respectively

1. sp and Sp³

2. sp and sp

3. Sp and Sp²

4. Sp³and Sp³

The IUPAC name of the Compound is

 

1. 2,3 - Diemethylheptane

2. 3- Methyl -4- ethyloctane

3. 5-ethyl -6-methyloctane

4. 4-Ethyl -3 - methyloctane

Choose the correct statement:

1. Alkali metals are highly electropositive because of their low ionisation energies

2. Alkali metal cations have stable electronic configuration

3. The hydration enthalpies of alkali metals decreases from Li⁺ to Cs⁺

4. all the above.

Statement-I: The pressure cooker takes more time for cooking at high altitude.
Statement-II: Air is subjected to Earth's gravitational force. The pressure of air gradually decreases from the surface of the Earth to higher altitude.

1. Statement-I and II are correct and Statement-II is the correct explanation of Statement-I

2. Statement-I and II are correct but Statement-II is not the correct explanation of Statement-I

3. Statement-I is wrong but Statement-II is correct

4. Statement-I is correct but Statement-II is wrong

The freezing point depression constant for water is 1.86^o K Kg mol^-1. If 5g Na₂SO₄ is dissolved in 45g water, the depression in freezing point is 3.64^oC. The Vant Hoff factor for Na₂SO₄ is

 

1. 2.50

2. 2.63

3. 3.64

4. 5.50

Which of the following pair is not diagonally related?

1. Li, Mg

2. Li, Na

3. Be, Al

4. B, Si

Potassium super oxide is used in oxygen cylinders in space and submarine, because it:

1. absorbs CO₂ and increases O₂ constant

2. eliminates moisture

3. absorbs CO₂

4. produces O₂

Which one of the following is used to test primary amines?

1. Schiff's test

2. Carbylamine test

3. Dye test

4. Silver mirror test

Equal moles of hydrogen and oxygen gases are placed in a container, with a pin-hole through which both can escape what fraction of oxygen escapes in the time required for one-half of the hydrogen to escape.

1. \(\frac { 3 }{ 8 } \)

2. \(\frac { 1 }{ 2 } \)

3. \(\frac { 1 }{ 8 } \)

4. \(\frac { 1 }{ 4 } \)

During the formation of a chemical bond ________.

1. energy decreases

2. energy increases

3. energy remains zero

4. energy remains constant

Which of the following configuration is correct for iron?

1. 1s²2s²2p⁶3s²3p⁶4s²3d⁷

2. 1s²2s²2p⁶3s²3p⁶4s²3d⁵

3. 1s²2s²2p⁶3s²3p⁶3d⁵

4. 1s²2s²2p⁶3s²3p⁶4s²3d⁶

Vapour phase diagram for a solution is below if dotted line represents deviation?

Correct observation for this solution

 

1. \(\triangle\)H_mix  : +ve

2. \(\triangle\)S_mix : +ve 

3. \(\triangle\)V_mix : +ve

4. All of these

The energy of an electron in the 3rd orbit of hydrogen atom is -E. The energy of an electron in the first orbit will be

1. -3E

2. \(\frac{-E}{3}\)

3. \(\frac{-E}{9}\)

4. -9E

The number of water molecules in a drop of water weighing 0.018 g is

1. 6.022 x 10²⁶

2. 6.022 x10²³

3. 6.022 x 10²⁰

4. 9.9 x 10²²

The layer of atmosphere which extends upto 10 km from sea level is called ______

 

1. Troposphere

2. Stratosphere

3. Ionosphere

4. Mesosphere

Which one of the following is true about metallic character when we move from left to right in a period and top to bottom in a group?

1. Decreases in a period and increases along the group

2. Increases in a period and decreases in a group

3. Increases both in the period and the group

4. Decreases both in the period and in the group

Consider the following statements.
(i) Gypsum is used in making surgical and orthopedic casts.
(ii) Calcium nitrate acts a coagulator in making tofu.
(iii) Gypsum plays an important role in soap making.
Which of the above statements is/are not correct.

1. (i) only

2. (ii) and (iii)

3. (i) and (iii)

4. (ii) only

Which one of the following is the smallest atom?

1. Francium

2. Rubidium

3. Lithium

4. Sodium

A portion of matter under consideration, which is separated from rest of universe by real or imaginary boundaries is called-----

1. surroundings

2. system

3. boundary

4. Universe

Which of the following metal is not in liquid state?

1. Gallium

2. Aluminium

3. Mercury

4. Caesium

Correctly match the list-land list-II using the code given below the list.

List-I		List-II
A	Quick lime	1	Casts of statues
B	Calcium hydroxide	2	Drying agent
C	Gypsum	3	White washing
D	Plaster of paris	4	Tooth paste

1. A	B	C	D
   2	3	4	1

2. A	B	C	D
   3	4	1	2

3. A	B	C	D
   1	3	2	4

4. A	B	C	D
   4	1	3	2

In which of the following does the reaction go almost to completion?

 

1. K_c = 10³

2. K_c = 10²

3. K_c = 10^-2

4. K_c= 10^-3

When beryllium carbide reacts with water, the product mainly formed is ______

1. ethane

2. methane

3. acetylene

4. ethene

C(diamond) ) ⟶ C(graphite), ΔH = -ve, this indicates that

1. graphite is more stable than diamond

2. graphite has more energy than diamond

3. both are equally stable

4. stability cannot be predicted

Which of the following is not among short comings of Bohr's model?

1. Bohr theory could not account for the fine lines in the atomic spectrum

2. Bohr theory was unable to account for the splitting of the spectral lines in the presence of magnetic field

3. No explanation for using the principle of quantisation of angular momentum

4. It did not give information about energy level