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CBSE Questions for Class 11 Commerce Economics Use Of Statistical Tools Quiz 3 - MCQExams.com
CBSE
Class 11 Commerce Economics
Use Of Statistical Tools
Quiz 3
The compound that does not produce nitrogen has by the thermal decomposition is:
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$$NH_4NO_2$$
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$$(NH_4)_2SO_4$$
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$$Ba(N_3)_2$$
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$$(NH_4)_2Cr_2O_7$$
Explanation
$$NH_4NO_2\rightarrow2H_2O+N_2$$
$$2(NH_4)_2SO_4\rightarrow2NH_3+H_2SO_4$$
$$Ba(N_3)_2\rightarrow Ba+3N_2$$
$$(NH_4)_2Cr_2O_7\rightarrow Cr_2O_3+N_2+4H_2O$$
So, correct answer is $$(B)$$.
Which of the following compounds gives blood red colouration when its Lassaignes extract is treated with alkali and ferric chloride?
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Thiourea
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Diphenyl sulphide
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Phenyl hydrazine
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Benzamide
Explanation
Thiourea is a compound which has got sulphur, carbon, and nitrogen. The sodium fusion extract of the compound will have thiocyanate ions resulting red colour of ferric ions.
Hence answer is option A
$${N}_{2}$$ is estimated in organic compound by
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Duma's method
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Carius method
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Lassaigne's method
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None of these
Explanation
Duma's method can be used to estimate nitrogen in all type of organic compounds. Detection of nitrogen is done by Lassigne's test. Estimation of phosphorus is done by Carius method.
Choose the correct statement regarding the preparation of Lassaigne's extract of a given organic compound.
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Li can be used on the place of Na
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Li cannot be used on the place of Na because its compound are covalent in nature
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Both A and B
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None of these
Time series is an important statistical technique which is widely used by _________.
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Scientists
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Sociologists
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Research workers
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All of above
The molecular mass of a non-volatile organic compound is determined either by the Victor Meyer's.
method or Duma's method.
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True
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False
Explanation
determined by niether elevation in boiling point method or depression in freezing point method
Which among the following is not correctly matched with their colour?
$$\text {Compound}$$ $$\text {Colour}$$
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$$ Na_4[Fe(CN)_5NOS ] $$ purple
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$$ Fe_4[Fe(CN)_6]_3 $$ blue
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$$ Fe(CNS)_3 $$ blood red
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$$ AgCl $$ light yellow
Explanation
$$A)\underset{from\ sodium\ extracted}{Na_{2}S}+Na_{2}[Fe(CN)_{5}NO]\rightarrow \underset{purple\ colouration}{Na_{4}[Fe(CN)_{5}NOS]}$$
$$B) Na_{4}[Fe(CN)_{6}]+Fe^{+3}\rightarrow \underset{Ferric\ ferrocynid\\ \\ (blue\ colour)}{Fe_{4}[Fe(CN)_{6}]_{3}}$$
$$C)Fe^{+3}+3NaSCN \rightarrow \underset{\ \ Ferric\ thiocynate\\ \\ (Blood\ red\ colouration)}{Fe(SCN)_{3}}$$
$$D)Na+Cl\xrightarrow[From\ o.c]{\Delta }NaCl\xrightarrow[]{AgNO_{3}}\underset{white\ ppt}{AgCl}+NaNO_{3}$$
$$\therefore AgCl$$ is incorrect match with its colour
$$\mathbf{Hence\ correct\ answer\ is\ option\ (D)}$$
Molecular mass of a volatile organic solid can be determined by :
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Silver salt method
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Platinichloride method
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Victor Meyer's method
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Kjeldahl's method
Explanation
$$\text{The molecular mass of a volatile organic solid can be determined by }Victor Meyer’s \ method.$$
In Victor Meyer’s method a known mass of a volatile liquid or solid is converted into its vapour by heating in a Victor-Meyer's tube. The vapour displaces its own volume of air. The volume of air displaced by the vapour is measured at the experimental temperature and pressure. The volume of the vapour at s.t.p is then calculated. From this, the mass of $$2.24\times10^{−2}m^3$$ of the vapour at S.T.P. is calculated. This value represents the molecular mass of the substance.
Option C is correct.
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