Question Set A

CBSE 11th Chemistry Hydrocarbons Model Questions Papers Study Material - QB365

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Questions:

Multiple Choice Question

50 x 1 = 50

12 g of Mg will react completely with an acid to give: _______.

(a)

1 mole of O₂

(b)

\(\frac { 1 }{ 2 } \)mole of H₂

(c)

1 mole of H₂

(d)

2 mole of H₂

The empirical formula of sucrose is _______.

(a)

CH₂O

(b)

CHO

(c)

C₁₂H₂₂ O₁₁

(d)

C(H₂O)₂

The highest ionization energy is exhibited by _____.

(a)

halogens

(b)

alkaline earth metals

(c)

transition metals

(d)

noble gases

Which of the following is arranged in order of increasing radius?

(a)

K⁺ (aq) < Na ⁺ (aq) < Li⁺ (aq)

(b)

K⁺ (aq) > Na ⁺ (aq) > Zn²⁺ (aq)

(c)

K⁺ (aq) > Li⁺ (aq) > Na ⁺(aq)

(d)

Li⁺ (aq) < Na⁺ (aq) < K⁺ (aq)

What is the electronic configuration of the elements of group 14?

(a)

ns² np⁴

(b)

ns²np⁶

(c)

ns² np²

(d)

ns²

Among the following elements, which has the least electron affinity?

(a)

Phosphorous

(b)

Oxygen

(c)

Sulphur

(d)

Nitrogen

Diagonal relationships are shown by _____.

(a)

Be and Al

(b)

Mg and Al

(c)

Li and Mg

(d)

Band P

Which of the following species are not known?

(a)

AgOH

(b)

PbI₄

(c)

PI₅

(d)

SH₆

Which one of the following is isoelectronic with Ne?

(a)

N3^-

(b)

Mg²⁺

(c)

AI³⁺

(d)

all of the above

10.

Which element has smallest size?

(a)

(b)

(c)

(d)

11.

A liquid hydrocarbon is converted to a mixture of gaseous hydrocarbon by ______.

(a)

hydrolysis

(b)

oxidation

(c)

distillation

(d)

cracking

12.

The catalyst required for the given reaction is ______.
\(HC\equiv CH+dil{ \quad H }_{ 2 }{ SO }_{ 4 }\overset { Catalyst }{ \longrightarrow } { CH }_{ 3 }CHO\)

(a)

HgSO₄

(b)

(c)

A1CI₃

(d)

13.

Baeyer's reagent is ______.

(a)

aqueous KMnO₄

(b)

neutral KMnO₄

(c)

alkaline KMnO₄

(d)

aqueous bromine water

14.

Which set of figures will be obtained after rounding upto three significant figures 1.386, 4.334, 2.808?

(a)

1.39,4.34, 2.809

(b)

1.39,4.33, 2.81

(c)

1.38,4.34, 2.800

(d)

1.39,4.34, 2.80

15.

Which of the following reactions is not correct according to the law of conservation of mass?

(a)

2Mg(s) +O₂(g) \(\Rightarrow\) 2MgO(s)

(b)

C₃H₈(g)+ O₂(g) \(\Rightarrow\) CO₂(g)+ H₂O(g)

(c)

P₄(s) + 5O₂(g) \(\Rightarrow\) P₄O₁₀(S)

(d)

CH₄(g)+ 2O₂(g) \(\Rightarrow\) CO₂(g)+ 2H₂O(g)

16.

The number of atoms present in one mole of an element is equal to Avogadro number. Which of the following element contains the greatest number of atoms?

(a)

4 g He

(b)

46 g Na

(c)

0.40 g Ca

(d)

12 g He

17.

A compound contains 69.5% oxygen, 30.5% nitrogen and its molecular weight is 92. The formula of compound is _______.

(a)

N₂O

(b)

NO₂

(c)

N₂O₄

(d)

N₂O₅

18.

The empirical formula of a compound is CH₂. One mole of this compound has a mass of 42 g. Its molecular formula is _______.

(a)

C₃H₆

(b)

C₃H₈

(c)

CH₂

(d)

C₂H₂

19.

An organic compound on analysis was found to contain 10.06% carbon, 0.84% hydrogen and 89.10% chlorine. What will be the empirical formula of the substance?

(a)

CH₂Cl₂

(b)

CHCl₃

(c)

CCl₄

(d)

CH₃CI

20.

One mole of any substance contains 6.022 x 10²³ atoms/molecules. Number of molecules of H₂SO₄ present in 100 mL of 0.02M H₂SO₄ solution is .........

(a)

12.044 x 10²⁰ molecules

(b)

6.022 x 10²³ molecules

(c)

1 x 10²³ molecules

(d)

12.044 x 10²³ molecules

21.

What will be the molality of the solution containing 18.25g of HCl gas in 500 g of water?

(a)

0.1 m

(b)

1 M

(c)

0.5 m

(d)

1 m

22.

Which of the following statements is/ are incorrect?

(a)

The weight of a substance can be determined very accurately by using an analytical balance

(b)

Volume is denoted in dm³ units

(c)

Density of a substance is its amount present per unit volume

(d)

Candela is the luminous intensity, that emits monochromatic radiation of frequency, 540 x 10¹²Hz

23.

How many number of molecules and atoms respectively are present in 2.8 L of a diatomic gas at STP?

(a)

6.023 x 10²³, 7.5 x 10²³

(b)

6.023 x 10²³,15 x 10²²

(c)

7.5 x 10²²,15 x 10²²

(d)

15 x 10²²,7.5 x 10²³

24.

Mendeleev's left the gap under aluminium and a gap under silicon having atomic weights 68 and 72 respectively. These elements respectively are _____.

(a)

Eka-aluminium and Eka-silicon

(b)

aluminium and silicon

(c)

Eka-germanium and Eka-silicon

(d)

Eka-aluminium and Eka-germanium

25.

Elements having similar outer shell electronic configuration in their atoms are arranged in _____.

(a)

groups

(b)

vertical columns

(c)

families

(d)

All of these

26.

Who developed the long form of the periodic table?

(a)

Niels Bohr

(b)

Moseley

(c)

Mendeleef

(d)

Lothar Meyer

27.

Periodic classification of elements can be done on the basis of electronic configuration and is used to examine the _____.

(a)

periodic trends in physical properties of elements

(b)

periodic trends in chemical properties of elements

(c)

Both (a) and (b)

(d)

None of the above

28.

The symbol and name according to the IUPAC system for the element with atomic number = 120,respectively are _____.

(a)

Ubn and unbinilium

(b)

Ubn and unbiunium

(c)

Ubn and unnilbium

(d)

Ubn and unnilium

29.

General outer electronic configuration of d-block elements is _____.

(a)

\((n-1) d^{1-10} n s^{3}\)

(b)

\((n+1) d^{1-10} n s^{0-2}\)

(c)

\((n-1) d^{1-10} n s^{0-2}\)

(d)

\((n-1) d^{0} n s^{0-2}\)

30.

3d-transition series of elements starts with scandium which has the electronic configuration _____.

(a)

3d¹4s²

(b)

3d¹4s¹

(c)

3d² 4s²

(d)

3d³ 4s²

31.

Among the following, which hydrocarbon is not produced by Wurtz reaction?

(a)

methane

(b)

ethane

(c)

propane

(d)

All given options can be prepared

32.

Soda lime is a mixture of ______.

(a)

NaOH + Ca(OH)₂

(b)

NaOH + Mg(OH)₂

(c)

NaOH + CaO

(d)

NaOH + MgO

33.

Arrange the halogens F₂, CI₂, Br₂, I₂ in order of their increasing reactivity with alkanes.

(a)

I₂< Br₂< CI₂ < F₂

(b)

Br₂ < CI₂ < F₂ < I₂

(c)

F₂ < CI₂ < Br₂ < I₂

(d)

Br₂< I₂ < CI₂ < F₂

34.

The IUPAC name of

(a)

2-methylbutene

(b)

1-methylpropene

(c)

2-methylbut-2-ene

(d)

2-methylprop-1-ene

35.

Number of σ-bonds and π-bonds present in
is ______.

(a)

σ-bond = 17
π-bond = 4

(b)

σ-bond = 14
π-bond = 3

(c)

σ-bond = 18
π-bond = 4

(d)

σ-bond = 15
π-bond = 3

36.

The major product formed when 3,3-dimethyl butan-2-ol is heated with concentrated sulphuric acid is ______.

(a)

2,3-dimethylbut-l-ene

(b)

2,3-dimethylbut-2-ene

(c)

3,3-dimethylbut-l-ene

(d)

cis and trans-isomers of 2,3-dimethylbut-1-ene

37.

The correct IUPAC name of the given structure

(a)

2-methylbut-1-yne

(b)

I-methylbut-3-yne

(c)

2-methylbut-3-yne

(d)

3-methylbut-1-yne

38.

When CH₃ - C \(\equiv\) CH reacts with one mole of HBr then product obtained is ______.

(a)

bromoethene

(b)

dibromopropane

(c)

2-bromopropene

(d)

1-brornopropane

39.

Acidic potassium permanganate/potassium dichromate oxidises alkenes to produce ______.

(a)

ketones/acids

(b)

ketones/aldehyde

(c)

ketones/alcohols

(d)

ketones/ether

40.

The aromatic compound among the following is ______.

(a)

(b)

(c)

(d)

All of these

41.

\(+\text { Conc. } \mathrm{HNO}_{3}+\text { Conc. } \mathrm{H}_{2} \mathrm{SO}_{4} \stackrel{(323-333) \mathrm{K}}{\longrightarrow}\) Here, A refers to ______.

(a)

(b)

(c)

(d)

All of these

42.

Which of the following set of functional groups is meta-directing group?

(a)

-NO₂, -NH₂, -COOH, - COOR

(b)

-NO₂, -CHO, -SO₃H, - COR

(c)

CN, -CHO, -NHCOCH₃, -COOR

(d)

- CN, -NH₂, -NHR, -OCH₃

43.

Which of the following organic materials damage DNA of our body?

(a)

Tobacco

(b)

Coal

(c)

Petroleum

(d)

All of these

44.

Which of the following pairs have the same number of atoms?

(a)

16 g of O₂(g) and 4 g of H₂(g)

(b)

16 g of O₂ and 44 g of CO₂

(c)

28 g of N₂ and 32 g of O₂

(d)

12 g of C(s) and 23 g of Na(s)

45.

16 g of oxygen has same number of molecules as in _______.

(a)

16 g of CO

(b)

28 g of N₂

(c)

14 g of N₂

(d)

1.0 g of H₂

46.

Which of the following terms are unitless?

(a)

Molality

(b)

Molarity

(c)

Mole fraction

(d)

Mass percent

47.

In the modern periodic table, the period indicates the value of :

(a)

atomic number

(b)

atomic mass

(c)

principal quantum number

(d)

azimuthal quantum number

48.

Anything that influences the valence electrons will affect the chemistry of the element. Which one of the following factors does not affect the valence shell?

(a)

Valence principal quantum number (n)

(b)

Nuclear charge (Z)

(c)

Nuclear mass

(d)

Number of core electrons

49.

The size of isoelectronic species — F^– , Ne and Na⁺ is affected by______.

(a)

nuclear charge (Z)

(b)

valence principal quantum number (n)

(c)

electron-electron interaction in the outer orbitals

(d)

none of the factors because their size is the same

50.

Considering the elements B, Al, Mg, and K, the correct order of their metallic character is :

(a)

B > Al > Mg > K

(b)

Al > Mg > B > K

(c)

Mg > Al > K > B

(d)

K > Mg > Al > B

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Answers Key:

Multiple Choice Question

50 x 1 = 50

(b)
\(\frac { 1 }{ 2 } \)mole of H₂

(b)
alkaline earth metals

(d)
Nitrogen

(d)
all of the above

10.

(b)
N

11.

(d)
cracking

12.

(a)
HgSO₄

13.

14.

(b)
1.39,4.33, 2.81

15.

(b)
C₃H₈(g)+ O₂(g) \(\Rightarrow\) CO₂(g)+ H₂O(g)

16.

(d)
12 g He

17.

18.

(a)
C₃H₆

19.

(b)
CHCl₃

20.

(a)
12.044 x 10²⁰ molecules

21.

(d)
1 m

22.

(a)
The weight of a substance can be determined very accurately by using an analytical balance

23.

24.

(a)
Eka-aluminium and Eka-silicon

25.

(d)
All of these

26.

(a)
Niels Bohr

27.

28.

(a)
Ubn and unbinilium

29.

30.

(a)
3d¹4s²

31.

(a)
methane

32.

33.

(a)
I₂< Br₂< CI₂ < F₂

34.

(d)
2-methylprop-1-ene

35.

(a)
σ-bond = 17
π-bond = 4

36.

(b)
2,3-dimethylbut-2-ene

37.

(d)
3-methylbut-1-yne

38.

39.

(a)
ketones/acids

40.

(d)
All of these

41.

(d)
All of these

42.

(b)
-NO₂, -CHO, -SO₃H, - COR

43.

(d)
All of these

44.

45.

46.

47.

In the modern periodic table, each period begins with the filling of a new shell. Therefore, the period indicates the value of principal quantum number. Thus, option (c) is correct.

48.

49.

(a)
nuclear charge (Z)

50.

In a period, metallic character decreases as we move from left to right. Therefore, metallic character of K, Mg and Al decreases in the order: K > Mg > AI. However, within a group, the metallic character, increases from top to bottom. Thus, Al is more metallic than B. Therefore, the correct sequence of decreasing metallic character is: K> Mg > Al > B, i.e., option (d) is correct.