In an organic compound of molar mass \[108gmo{{l}^{-1}}C\], H and N atoms are present in 9 : 1 : 3.5 by mass. Molecular formula can be:

\[{{C}_{6}}{{H}_{8}}{{N}_{2}}\]

\[{{C}_{5}}{{H}_{6}}{{N}_{3}}\]

\[{{C}_{4}}{{H}_{18}}{{N}_{3}}\]

Hardness of water is due to presence of salts of [BHU 2005]

\[C{{a}^{2+}}\]and \[{{K}^{+}}\]

\[N{{a}^{+}}\] and \[{{K}^{+}}\]

\[C{{a}^{2+}}\]and \[M{{g}^{2+}}\]

\[C{{a}^{2+}}\]and \[{{K}^{+}}\]

\[C{{a}^{2+}}\] and \[N{{a}^{+}}\]

When Al is added to \[NaOH\] solution

\[Al{{\left( OH \right)}_{3}}\] is formed and \[{{H}_{2}}\] is evolved

\[NaAl{{O}_{2}}\] is formed and \[{{H}_{2}}\] is evolved

\[Al{{\left( OH \right)}_{3}}\] is formed and \[{{H}_{2}}\] is evolved

\[N{{a}_{2}}Al{{O}_{2}}\] is formed and\[{{H}_{2}}\]is evolved

Which of the following is not true

Bond dissociation energy for \[{{D}_{2}}\] is greater than \[{{H}_{2}}\]

Ordinary water is electrolysed more rapidly than \[{{D}_{2}}O\]

Reaction between \[{{H}_{2}}\] and \[C{{l}_{2}}\] is much faster than \[{{D}_{2}}\] and \[C{{l}_{2}}\]

\[{{D}_{2}}O\] freezes at lower temperature than \[{{H}_{2}}O\]

Bond dissociation energy for \[{{D}_{2}}\] is greater than \[{{H}_{2}}\]

Which of the following is most likely to show optical isomerism [UPSEAT 2004]

\[HC\equiv C-\underset{Cl}{\overset{H}{\mathop{\underset{|}{\overset{|}{\mathop{C}}}\,}}}\,-H\]

\[HC\equiv C-\underset{Cl\,}{\overset{H\,}{\mathop{\underset{|}{\overset{|}{\mathop{C}}}\,-}}}\,C\equiv CH\]

\[HC\equiv C-\underset{Cl}{\overset{H}{\mathop{\underset{|}{\overset{|}{\mathop{C}}}\,}}}\,-C{{H}_{3}}\]

\[HC\equiv C-\underset{Cl}{\overset{H}{\mathop{\underset{|}{\overset{|}{\mathop{C}}}\,}}}\,-H\]

\[HC\equiv C-\overset{Cl}{\mathop{\overset{|}{\mathop{C}}\,}}\,=C{{H}_{2}}\]

Which of the following is the key step in the manufacture of sulphuric acid?

Absorption of \[S{{O}_{3}}\] in \[{{H}_{2}}S{{O}_{4}}\] to give oleum.

Burning of sulphur or sulphide ores in air to generate \[S{{O}_{2}}\].

Conversion of \[S{{O}_{2}}\] to \[S{{O}_{3}}\] by the reaction with oxygen in presence of catalyst.

Absorption of \[S{{O}_{3}}\] in \[{{H}_{2}}S{{O}_{4}}\] to give oleum.

Which of the following compounds is not chiral [CBSE PMT 1998; DPMT 2002]

\[DC{{H}_{2}}C{{H}_{2}}C{{H}_{2}}Cl\]

\[C{{H}_{3}}CHDC{{H}_{2}}C{{H}_{2}}Cl\]

The formation of \[O_{2}^{+}{{[Pt{{F}_{6}}]}^{-}}\] is the basis for the formation of xenon fluorides. This is because

\[{{O}_{2}}\] and Xe have comparable sizes.

both \[{{O}_{2}}\] and Xe are gases.

\[{{O}_{2}}\] and Xe have comparable ionization energies.

\[\pi _{{{p}_{y}}}^{*}\] molecularorbital - \[\Psi \](ungerade)

\[{{d}_{{{x}^{2}}-{{y}^{2}}}}\]atomic orbital - One nodal plane

\[{{p}_{y}}\] atomic orbital - Two nodal planes

\[{{\sigma }_{{{p}_{x}}}}\] molecular orbital - \[\Psi \](gerade)

\[\pi _{{{p}_{y}}}^{*}\] molecularorbital - \[\Psi \](ungerade)

Heavy water is [AFMC 1997; UPSEAT 2003 MH CET 2003; Pb. CET 2001]

Water obtained after a number of distillations

Heavy water is compound of [DPMT 2001; DCE 2002]

Hydrogen and heavier isotopes of oxygen

Oxygen and heavier isotopes of hydrogen

Hydrogen and heavier isotopes of oxygen

Heavier isotopes of oxygen and hydrogen

Which of the following will determine whether the given colourless liquid is water or not

Adding a pinch of anhydrous \[CuS{{O}_{4}}\]

In nitroprusside ion, the iron and NO exist as \[F{{e}^{2+}}\] and \[N{{O}^{+}}\] rather than \[F{{e}^{3+}}\] and NO. These forms can be differentiated by

thermally decomposing the compound.

estimating the concentration of iron.

measuring the concentration of \[C{{N}^{-}}\]

measuring the solid state magnetic moment.

thermally decomposing the compound.

In the periodic table, the metallic character of elements [MP PET 1993]

Increases from left to right across a period and on descending a group

Decreases from left to right across a period and on descending a group

Decreases from left to right across a period and increases on descending a group

Increases from left to right across a period and on descending a group

Increases from left to right across a period and decreases on descending a group

Which of the following may exist in enantiomorphs [CBSE PMT 1988]

\[C{{H}_{3}}-\overset{C{{H}_{3}}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}{\mathop{\overset{|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}{\mathop{CH-COOH\,}}\,}}\,\]

\[C{{H}_{2}}=CHC{{H}_{2}}C{{H}_{2}}C{{H}_{3}}\]

\[C{{H}_{3}}-\overset{N{{H}_{2}}\,\,\,\,\,\,\,\,\,\,\,\,}{\mathop{\overset{|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}{\mathop{CH-C{{H}_{3}}\,}}\,}}\,\]

\[C{{H}_{3}}-C{{H}_{2}}-\overset{N{{H}_{2}}\,\,\,\,\,\,\,\,\,\,\,\,}{\mathop{\overset{|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}{\mathop{CH-C{{H}_{3}}}}\,}}\,\]

Sodium sulphate is soluble in water but barium sulphate is insoluble because [Pb. PMT 1995]

The hydration energy of \[N{{a}_{2}}S{{O}_{4}}\] is more than its lattice energy

The lattice energy of \[BaS{{O}_{4}}\] is more than its hydration energy

The lattice energy has no role to play in solubility

The hydration energy of \[N{{a}_{2}}S{{O}_{4}}\] is less than its lattice energy

The angular momentum of an electron in a given orbit is J. Its kinetic energy will be:

\[\frac{1}{2}\,\frac{{{J}^{2}}}{m{{r}^{2}}}\]

11242 + Mcqs in Chemistry in Joint Entrance Exam - Main (JEE Main) Page 1 McqOptions

1.	In an organic compound of molar mass \[108gmo{{l}^{-1}}C\], H and N atoms are present in 9 : 1 : 3.5 by mass. Molecular formula can be:
A.	\[{{C}_{6}}{{H}_{8}}{{N}_{2}}\]
B.	\[{{C}_{7}}{{H}_{10}}N\]
C.	\[{{C}_{5}}{{H}_{6}}{{N}_{3}}\]
D.	\[{{C}_{4}}{{H}_{18}}{{N}_{3}}\]
Answer» B. \[{{C}_{7}}{{H}_{10}}N\]

2.	Which of the following acid is formed when \[Si{{F}_{4}}\] reacts with water [BHU 2004]
A.	\[Si{{F}_{4}}\]
B.	\[{{H}_{2}}Si{{F}_{4}}\]
C.	\[{{H}_{2}}S{{O}_{4}}\]
D.	\[{{H}_{2}}Si{{F}_{6}}\]
Answer» C. \[{{H}_{2}}S{{O}_{4}}\]

3.	Triple point of water is [AFMC 2004]
A.	\[273K\]
B.	\[373K\]
C.	\[203K\]
D.	\[193K\]
Answer» B. \[373K\]

5.	\[C{{H}_{3}}C{{H}_{2}}CH=C{{H}_{2}}\] and \[C{{H}_{3}}-CH=CH-C{{H}_{3}}\] show
A.	Chain isomerism
B.	Position isomerism
C.	Functional isomerism
D.	Metamerism
Answer» C. Functional isomerism

6.	X and Y are two elements which form \[{{X}_{2}}{{Y}_{3}}\] and \[{{X}_{3}}{{Y}_{4}}\]. If 0.20 mol of \[{{X}_{2}}{{Y}_{2}},\] weighs 32.0 g and 0.4 mol of \[{{X}_{3}}{{Y}_{4}}\] weighs 92.8 g, the atomic weights of X and Y are respectively
A.	16.0 and 56.0
B.	8.0 and 28.0
C.	56.0 and 16.0
D.	28.0 and 8.0
Answer» B. 8.0 and 28.0

7.	How many ml of 1 (M) \[{{H}_{2}}S{{O}_{4}}\] is required to neutralise 10 ml of 1 (M) NaOH solution [MP PET 1998; MNR 1982; MP PMT 1987]
A.	2.5
B.	5.0
C.	10.0
D.	20.0
Answer» C. 10.0

8.	Which element do you think would have been named by Lawrence Berkeley laboratory?
A.	Berkelium
B.	Lawrencium
C.	Both [a] and [b]
D.	Seaborgium
Answer» D. Seaborgium

9.	DIRECTION: Read the passage given below and answer the questions that follows: In hexagonal systems of crystals, a frequently encountered arrangement of atoms is described as a hexagonal prism. Here, the top and bottom of the cell are regular hexagons and three atoms sandwiched in between them. A space-of this model of this structure, called hexagonal close-packed (HCP), is constituted of a sphere on a flat surface surrounded in the same plane by six identical spheres as closely as possible. There spheres are then placed over the first layer so that they touch each other and represent the second layer. Each one of these three spheres touches three spheres of the bottom layer. Finally, the second layer is covered with third layer that is identical to the bottom layer in relative position. Assume radius of every sphere to be 'r'. The number of atoms in the HCP unit cell is
A.	4
B.	6
C.	12
D.	17
Answer» C. 12

10.	Which one of the following oxides is neutral [IIT-JEE 1996]
A.	CO
B.	\[Sn{{O}_{2}}\]
C.	ZnO
D.	\[Si{{O}_{2}}\]
Answer» B. \[Sn{{O}_{2}}\]

11.	An ideal gaseous mixture of ethane \[({{C}_{2}}{{H}_{5}})\] and ethene \[({{C}_{2}}{{H}_{4}})\] occupies 28 litre at 1 atm and 273 K. The mixture reacts completely with 128 g \[{{O}_{2}}\] to produce \[C{{O}_{2}}\] and \[{{H}_{2}}O\]. Mole fraction at \[{{C}_{2}}{{H}_{6}}\] in the mixture is:
A.	0.6
B.	0.4
C.	0.5
D.	0.8
Answer» C. 0.5

12.	A mixture of \[{{O}_{2}}\] and gas "Y" mol. mass 80 in the mole ratio a : b has a mean molecular mass 40. What would be mean molecular mass, if the gases are mixed in the ratio b : a under, identical conditions? (Assume that gases are non-reacting):
A.	40
B.	48
C.	62
D.	72
Answer» E.

14.	Heavy water freezes at
A.	\[0{}^\circ C\]
B.	\[3.8{}^\circ C\]
C.	\[38{}^\circ C\]
D.	\[0.38{}^\circ C\]
Answer» C. \[38{}^\circ C\]

15.	The pH of \[{{D}_{2}}O\] and \[{{H}_{2}}O\] at 298 K is
A.	7.0, 7.0
B.	7.35, 7.0
C.	7.0, 6.85
D.	6.85, 7.35
Answer» C. 7.0, 6.85

17.	Which one of the following is an optically active compound [CBSE PMT 1988; DPMT 1983]
A.	n-propanol
B.	2-chlorobutane
C.	n-butanol
D.	4-hydroxyheptane
Answer» C. n-butanol

18.	The functional isomer of ethyl alcohol is [MP PMT 2002]
A.	\[C{{H}_{3}}OC{{H}_{3}}\]
B.	\[C{{H}_{3}}COC{{H}_{3}}\]
C.	\[C{{H}_{3}}COOH\]
D.	\[C{{H}_{3}}C{{H}_{2}}CHO\]
Answer» B. \[C{{H}_{3}}COC{{H}_{3}}\]

13.	When Al is added to \[NaOH\] solution
A.	No action takes place
B.	\[NaAl{{O}_{2}}\] is formed and \[{{H}_{2}}\] is evolved
C.	\[Al{{\left( OH \right)}_{3}}\] is formed and \[{{H}_{2}}\] is evolved
D.	\[N{{a}_{2}}Al{{O}_{2}}\] is formed and\[{{H}_{2}}\]is evolved
Answer» C. \[Al{{\left( OH \right)}_{3}}\] is formed and \[{{H}_{2}}\] is evolved

20.	Acidity of pentoxides in VA group [CPMT 1982]
A.	Decreases
B.	Increases
C.	Remains same
D.	None
Answer» B. Increases

21.	If the valency shell electronic structure for an element is \[n{{s}^{2}}n{{p}^{5}}\], this element will belong to the group of [CBSE PMT 1992]
A.	Alkali metals
B.	Inert metals
C.	Noble gases
D.	Halogens
Answer» E.

23.	A picometre is written as
A.	\[{{10}^{-9}}\]m
B.	\[{{10}^{-10}}\]m
C.	\[{{10}^{-11}}\]m
D.	\[{{10}^{-12}}\]m
Answer» E.

24.	Out of the following elements which one do you expect to be most reactive chemically [CPMT 1983]
A.	\[Mg\]
B.	\[Ca\]
C.	\[Sr\]
D.	\[Ba\]
Answer» E.

25.	Which of the following compounds is not chiral [CBSE PMT 1998; DPMT 2002]
A.	\[DC{{H}_{2}}C{{H}_{2}}C{{H}_{2}}Cl\]
B.	\[C{{H}_{3}}C{{H}_{2}}CHDCl\]
C.	\[C{{H}_{3}}CHDC{{H}_{2}}C{{H}_{2}}Cl\]
D.	\[C{{H}_{2}}CHClC{{H}_{2}}D\]
Answer» B. \[C{{H}_{3}}C{{H}_{2}}CHDCl\]

26.	3F of electricity passes through three electrolytic cells connected in series containing \[A{{g}^{+}},C{{a}^{2+}}\] and \[A{{l}^{3+}}\] ions, respectively. The molar ratio in which the three metal ions are liberated at the electrodes is
A.	0.0430902777777778
B.	2 : 3 : 1
C.	0.252106481481481
D.	0.127800925925926
Answer» D. 0.127800925925926

27.	Which one of the following oxides of chlorine is obtained by passing dry chlorine over silver chlorate at \[90{}^\circ C\]?
A.	\[C{{l}_{2}}O\]
B.	\[Cl{{O}_{3}}\]
C.	\[Cl{{O}_{2}}\]
D.	\[CI{{O}_{4}}\]
Answer» D. \[CI{{O}_{4}}\]

29.	250 mL of a sodium carbonate solution contains 2.65 g of \[N{{a}_{2}}C{{O}_{3}}.\] If 10 mL of this solution is diluted to one litre, what is the concentration of the resultant solution? (mol. wt. of\[N{{a}_{2}}C{{O}_{3}}=106\])
A.	0.1 M
B.	0.01 M
C.	0.001 M
D.	\[{{10}^{-4}}M\]
Answer» D. \[{{10}^{-4}}M\]

30.	Correctly match is:
A.	\[{{d}_{{{x}^{2}}-{{y}^{2}}}}\]atomic orbital - One nodal plane
B.	\[{{p}_{y}}\] atomic orbital - Two nodal planes
C.	\[{{\sigma }_{{{p}_{x}}}}\] molecular orbital - \[\Psi \](gerade)
D.	\[\pi _{{{p}_{y}}}^{*}\] molecularorbital - \[\Psi \](ungerade)
Answer» D. \[\pi _{{{p}_{y}}}^{*}\] molecularorbital - \[\Psi \](ungerade)

Explore topic-wise MCQs in Joint Entrance Exam - Main (JEE Main).

In an organic compound of molar mass \[108gmo{{l}^{-1}}C\], H and N atoms are present in 9 : 1 : 3.5 by mass. Molecular formula can be:

Which of the following acid is formed when \[Si{{F}_{4}}\] reacts with water [BHU 2004]

Triple point of water is [AFMC 2004]

Hardness of water is due to presence of salts of [BHU 2005]

\[C{{H}_{3}}C{{H}_{2}}CH=C{{H}_{2}}\] and \[C{{H}_{3}}-CH=CH-C{{H}_{3}}\] show

X and Y are two elements which form \[{{X}_{2}}{{Y}_{3}}\] and \[{{X}_{3}}{{Y}_{4}}\]. If 0.20 mol of \[{{X}_{2}}{{Y}_{2}},\] weighs 32.0 g and 0.4 mol of \[{{X}_{3}}{{Y}_{4}}\] weighs 92.8 g, the atomic weights of X and Y are respectively

How many ml of 1 (M) \[{{H}_{2}}S{{O}_{4}}\] is required to neutralise 10 ml of 1 (M) NaOH solution [MP PET 1998; MNR 1982; MP PMT 1987]

Which element do you think would have been named by Lawrence Berkeley laboratory?

Which one of the following oxides is neutral [IIT-JEE 1996]

An ideal gaseous mixture of ethane \[({{C}_{2}}{{H}_{5}})\] and ethene \[({{C}_{2}}{{H}_{4}})\] occupies 28 litre at 1 atm and 273 K. The mixture reacts completely with 128 g \[{{O}_{2}}\] to produce \[C{{O}_{2}}\] and \[{{H}_{2}}O\]. Mole fraction at \[{{C}_{2}}{{H}_{6}}\] in the mixture is:

A mixture of \[{{O}_{2}}\] and gas "Y" mol. mass 80 in the mole ratio a : b has a mean molecular mass 40. What would be mean molecular mass, if the gases are mixed in the ratio b : a under, identical conditions? (Assume that gases are non-reacting):

When Al is added to \[NaOH\] solution

Heavy water freezes at

The pH of \[{{D}_{2}}O\] and \[{{H}_{2}}O\] at 298 K is

Which of the following is not true

Which one of the following is an optically active compound [CBSE PMT 1988; DPMT 1983]

The functional isomer of ethyl alcohol is [MP PMT 2002]

Which of the following is most likely to show optical isomerism [UPSEAT 2004]

Acidity of pentoxides in VA group [CPMT 1982]

If the valency shell electronic structure for an element is \[n{{s}^{2}}n{{p}^{5}}\], this element will belong to the group of [CBSE PMT 1992]

Which of the following is the key step in the manufacture of sulphuric acid?

A picometre is written as

Out of the following elements which one do you expect to be most reactive chemically [CPMT 1983]

Which of the following compounds is not chiral [CBSE PMT 1998; DPMT 2002]

3F of electricity passes through three electrolytic cells connected in series containing \[A{{g}^{+}},C{{a}^{2+}}\] and \[A{{l}^{3+}}\] ions, respectively. The molar ratio in which the three metal ions are liberated at the electrodes is

Which one of the following oxides of chlorine is obtained by passing dry chlorine over silver chlorate at \[90{}^\circ C\]?

The formation of \[O_{2}^{+}{{[Pt{{F}_{6}}]}^{-}}\] is the basis for the formation of xenon fluorides. This is because

250 mL of a sodium carbonate solution contains 2.65 g of \[N{{a}_{2}}C{{O}_{3}}.\] If 10 mL of this solution is diluted to one litre, what is the concentration of the resultant solution? (mol. wt. of\[N{{a}_{2}}C{{O}_{3}}=106\])

Correctly match is:

Significant figures in 0.00051 are

The number of \[S-S\] bonds in \[S{{O}_{3}},{{S}_{2}}O_{3}^{2-},{{S}_{2}}O_{6}^{2-}\] and \[{{S}_{2}}O_{8}^{2-}\] respectively are

Heavy water is [AFMC 1997; UPSEAT 2003 MH CET 2003; Pb. CET 2001]

Heavy water is compound of [DPMT 2001; DCE 2002]

Which of the following will determine whether the given colourless liquid is water or not

In nitroprusside ion, the iron and NO exist as \[F{{e}^{2+}}\] and \[N{{O}^{+}}\] rather than \[F{{e}^{3+}}\] and NO. These forms can be differentiated by

In the periodic table, the metallic character of elements [MP PET 1993]

The halogen that most easily reduced is [MP PMT 2000]

Which of the following may exist in enantiomorphs [CBSE PMT 1988]

The correct statement about the compounds A and B is [DCE 2002; UPSEAT 2004; IIT-JEE 1997; DPMT 2005]

If a carbon atom is attached to \[-H,-OH,-COOH\] and \[-OCO{{C}_{2}}{{H}_{5}}\] number of chiral C - atoms in compound is [RPMT 2003]

The number of possible structural isomers for a compound with the molecular formula \[{{C}_{7}}{{H}_{16}}\] is [DCE 2001]

Arrange the following in the order of increasing mass (atomic mass:\[O=16,\text{ }Cu=63,\text{ }N=14\])I. one atom of oxygenII. one atom of nitrogenIII. \[1\times {{10}^{-10}}\] mole of oxygenIV. \[1\times {{10}^{-10}}\] mole of copper

Choose the correct order of strength of following acids. (i) \[C{{H}_{3}}C{{H}_{2}}C{{H}_{2}}COOH\] (ii) \[~C{{H}_{3}}C{{H}_{2}}CH(Br)COOH\] (iii) \[C{{H}_{3}}CH(Br)C{{H}_{2}}COOH\] (IV) \[{{(C{{H}_{3}})}_{2}}CHCOOH\]

Sodium sulphate is soluble in water but barium sulphate is insoluble because [Pb. PMT 1995]

\[Al{{I}_{3}},\] when reacts with \[CC{{l}_{4}}\] gives

n-butane and isobutane are examples of

The total number of isomers formed by \[{{C}_{5}}{{H}_{10}}\] is [Bihar MEE 1996]

The angular momentum of an electron in a given orbit is J. Its kinetic energy will be:

Which of the following substances are soluble in concentrated \[HN{{O}_{3}}\] [Roorkee Qualifying 1998]

31.	Significant figures in 0.00051 are
A.	5
B.	3
C.	2
D.	4
Answer» D. 4

32.	The number of \[S-S\] bonds in \[S{{O}_{3}},{{S}_{2}}O_{3}^{2-},{{S}_{2}}O_{6}^{2-}\] and \[{{S}_{2}}O_{8}^{2-}\] respectively are
A.	1,0,0,1
B.	1,0,1,0
C.	0,1,1,0
D.	0,1,0,1
Answer» D. 0,1,0,1

33.	Heavy water is [AFMC 1997; UPSEAT 2003 MH CET 2003; Pb. CET 2001]
A.	Water containing Fe, Cr, Mn
B.	Water at 0°C
C.	\[{{D}_{2}}O\]
D.	Water obtained after a number of distillations
Answer» D. Water obtained after a number of distillations

35.	Which of the following will determine whether the given colourless liquid is water or not
A.	Melting
B.	Tasting
C.	Phosphthalein
D.	Adding a pinch of anhydrous \[CuS{{O}_{4}}\]
Answer» E.

38.	The halogen that most easily reduced is [MP PMT 2000]
A.	\[{{F}_{2}}\]
B.	\[C{{l}_{2}}\]
C.	\[B{{r}_{2}}\]
D.	\[{{I}_{2}}\]
Answer» B. \[C{{l}_{2}}\]

40.	The correct statement about the compounds A and B is [DCE 2002; UPSEAT 2004; IIT-JEE 1997; DPMT 2005]
A.	A and B are identical
B.	A and B are diastereomers
C.	A and B are enantiomers
D.	None of these
Answer» D. None of these

41.	If a carbon atom is attached to \[-H,-OH,-COOH\] and \[-OCO{{C}_{2}}{{H}_{5}}\] number of chiral C - atoms in compound is [RPMT 2003]
A.	1
B.	2
C.	3
D.	4
Answer» B. 2

42.	The number of possible structural isomers for a compound with the molecular formula \[{{C}_{7}}{{H}_{16}}\] is [DCE 2001]
A.	8
B.	9
C.	10
D.	12
Answer» C. 10

43.	Arrange the following in the order of increasing mass (atomic mass:\[O=16,\text{ }Cu=63,\text{ }N=14\])I. one atom of oxygenII. one atom of nitrogenIII. \[1\times {{10}^{-10}}\] mole of oxygenIV. \[1\times {{10}^{-10}}\] mole of copper
A.	II<I<III<IV
B.	I<II<III<IV
C.	III<II<IV<I
D.	IV<II<III<I
Answer» B. I<II<III<IV

44.	Choose the correct order of strength of following acids. (i) \[C{{H}_{3}}C{{H}_{2}}C{{H}_{2}}COOH\] (ii) \[~C{{H}_{3}}C{{H}_{2}}CH(Br)COOH\] (iii) \[C{{H}_{3}}CH(Br)C{{H}_{2}}COOH\] (IV) \[{{(C{{H}_{3}})}_{2}}CHCOOH\]
A.	I < II < III < IV
B.	IV < I < III < II
C.	IV < III < I < II
D.	II < I < III < IV
Answer» C. IV < III < I < II