MCQ Questions for Class 11 Commerce Economics Use Of Statistical Tools Quiz 1

What is qualitative analysis?

0%
Identification of unknown substance by direct observation
0%
Identification of unknown substance by chemical tests.
0%
Both A & B
0%
None of the above

Statistics studies _________ information.

0%
qualitative
0%
quantitative
0%
isolated
0%
nominal

The colour of bromine solution is :

0%
Red
0%
Purple
0%
Orange
0%
Green
0%
Blue

Which term is the best match for the color of a chemical substance students make note of:

0%
qualitative data
0%
inference
0%
observation
0%
quantitative data
0%
hypothesis

In sodium extract nitrogen is present as:

0%
sodamide
0%
sodium cyanide
0%
sodium nitrite
0%
sodium nitrate

Explanation

In sodium extract nitrogen is present as sodium cyanide.

$Na+C+N \overset{\Delta }{\rightarrow} NaCN$

Purity of organic liquid can be checked by its characteristic :

0%
boiling point
0%
volume
0%
solubility in water
0%
solubility in alcohol

Ammonium nitrate on heating gives ___________.

0%
nitric oxide
0%
nitrogen
0%
nitrogen peroxide
0%
nitrous oxide

Explanation

${NH}_{4}{NO}_{3}\xrightarrow [ ]{ on heating } 2{H}_{2}O+{N}_{2}O$
(NItrous oxide)

The indicator which is used to find the strength of caustic soda solution with the help of oxalic acid is:

0%
Methyl orange
0%
Phenolphthalein
0%
Potassium permanganate
0%
None of the above

Sodium extract gives blood red colour when treated with

$FeCl_{3}$ . Formation of blood red colour confirms the presence of:

0%
only nitrogen
0%
only sulphur
0%
only halogens
0%
both nitrogen and sulphur

Explanation

$Na+N+C+S \rightarrow Na SCN$
Sodium thiocyanate

$SCN^- +Fe^{3+}\rightarrow [Fe (SCN)]^{2+}$
Ferric thiocyanate (Blood-red colour)

It confirms the presence of both

$N$ and

$S$ .

Which of the following elements in an organic compound cannot be detected by Lassaigne's test?

0%
Nitrogen
0%
Sulphur
0%
Chlorine
0%
Hydrogen

Yellow ammonium sulphide can separate :

0%
$CdS$ and ${As}_{2}S_{3}$
0%
${Bi}_{2}{S}_{3}$ and $CuS$
0%
$PbS$ and ${Bi}_{2}{S}_{3}$
0%
$HgS$ and $PbS$

Explanation

Since

$CdS$ belongs to IIA group and

${ As }_{ 2 }{ S }_{ 3 }$ belongs to IIB group, they can be separated with yellow ammonium sulphide as only IIB group sulphides dissolve in yellow ammoium sulphide.

The dark turquoise-green solid copper(II) carbonate dissolves in hydrochloric acid to form a :

0%
green-blue solution of copper(II) chloride
0%
red solution of copper(II) chloride
0%
green-blue solution of copper(II) chlorinate
0%
green-blue solution of carbon dioxide

Explanation

The dark turquoise-green solid copper(II) carbonate dissolves in hydrochloric acid to form a green-blue solution of copper(II) chloride and effervescence from carbon dioxide formed.

$CuCO_3 + 2HCl \rightarrow CuCl_2 + H_2O + CO_2$

The fusion of an organic compound with solid sodium hydroxide is undertaken for testing nitrogen, sulphur and halogens. This test is called:

0%
Dumas method
0%
Carius method
0%
Kjeldahl's method
0%
Lassaigne's test

Explanation

It is a general test for the detection of halogens, nitrogen and sulphur in an organic compound. These elements are covalently bonded to the organic compounds. In order to detect them, these have to be converted into their ionic forms (

$e.g\: CN^−, S^{−2}, PO_3^{−4}$ and

$X^−$ ions). This is done by fusing the organic compound with sodium metal. The ionic compounds formed during the fusion are extracted in aqueous solution and can be detected by simple chemical tests. This is called Lassaigne's test.

Amongst the following elements present in an organic compound, the one which has no direct test for detection is :

0%
$Cl$
0%
$N$
0%
$S$
0%
$O$

Years	Production of Car P	Production of Car Q	Production of Car R
2001	76	59	28
2002	82	62	36
2003	65	47	42
2004	70	54	31
2005	85	57	49
2006	80	68	38

Direction (1-2) : Study the following table which shows the production of three different types of cars over the years.
The difference between the total production of three cars in the year

$2004$ and

$2006$ is _____.

0%
$11$
0%
$43$
0%
$31$
0%
$28$

Explanation

Total production of cars In year

$2004$

$= 70 + 54 + 31 = 155$
Total production of cars in year

$2006$

$= 80 + 68 + 38 = 186$
Hence, difference between the total production of three cars in the year

$2004$ and

$2006$

$= 186- 155 = 31$

Years	Production of Car P	Production of Car Q	Production of Car R
2001	76	59	28
2002	82	62	36
2003	65	47	42
2004	70	54	31
2005	85	57	49
2006	80	68	38

Direction (1-2) : Study the following table which shows the production of three different types of cars over the years.
The average production of which of the following types of cars was maximum?

0%
$Q$
0%
$P$
0%
$R$
0%
All are equal

Explanation

Average production of Car

$P$

$=$

$\dfrac {\text{Sum of production of Car P in each year}}{\text{Total number of years}}$

$=$

$\dfrac {76 + 82 + 65 + 70 + 85 + 80}{6}$

$=$

$\dfrac {458}{6}$

$= 76.33$
Average production of Car

$Q$

$=$

$\dfrac {59 + 62 + 47 + 54 + 57 + 68}{6}$

$=$

$\dfrac {347}{6}$

$= 57.83$
Average production of Car

$R$

$=$

$\dfrac {28 + 36 + 42 + 31 + 49 + 38}{6}$

$=$

$\dfrac {224}{6}$

$= 37.33$
Clearly, average production of Car

$P$ is greater than Car

$Q$ and Car

$R$ .
Hence, the average production of Car

$P$ is maximum.

Passing

${H}_{2}S$ gas into a mixture of

${ Mn }^{ 2+ },{ Ni }^{ 2+ },{ Cu }^{ 2+ },{ Hg }^{ 2+ }$ ions in acidified aqueous solution precipitates:

0%
$CuS$ and $HgS$
0%
$MnS$ and $CuS$
0%
$MnS$ and $NiS$
0%
$NiS$ and $HgS$

Explanation

${Cu}^{2+}$ and

${Hg}^{2+}$ lie in IInd group of qualitative analysis

${H}_{2}S$ in acid medium is reagent for it.

$HCl\rightarrow {H}^{+}+{Cl}^{-}$

${H}_{2}S\leftrightharpoons 2{H}^{+}+{S}^{2-}$

In Lassaigne's test, the organic compound is fused with a piece of sodium metal in order to:

0%
increase the ionisation of the compound
0%
decrease the melting point of the compound
0%
increase the reactivity of the compound
0%
convert the covalent compound into a mixture of ionic compounds

Statistics is a __________.

0%
science
0%
art
0%
language
0%
mathematics

Which of the following method is generally adopted by governments?

0%
Indirect oral interview
0%
Direct personal observation
0%
Valid questionnaries
0%
Information through agencies

CBSE Questions for Class 11 Commerce Economics Use Of Statistical Tools Quiz 1 - MCQExams.com

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Practice Class 11 Commerce Economics Quiz Questions and Answers

CBSE Questions for Class 11 Commerce Economics Use Of Statistical Tools Quiz 1 - MCQExams.com

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Practice Class 11 Commerce Economics Quiz Questions and Answers

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