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CBSE Questions for Class 11 Commerce Economics Use Of Statistical Tools Quiz 2 - MCQExams.com
CBSE
Class 11 Commerce Economics
Use Of Statistical Tools
Quiz 2
How do we differentiate between $${ Fe }^{ 3+ }$$ and $${ Cr }^{ 3+ }$$ in group III?
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By taking excess of $${ NH }_{ 4 }OH$$
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By increasing $${ NH }_{ 4 }^{ + }$$ ion cocentration
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By decreasing $${ OH }^{ - }$$ ion concentration
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Both (b) and (c)
Explanation
NH4+ ions are increased to suppress release of OH– ions, hence solubility product of Fe(OH)3 is attained. Colour of precipitate is different.
Which one of the following processes will produce hard water ?
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Saturation of water with $$CaCO_3$$
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Saturation of water with $$MgCO_3$$
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Saturation of water with $$MgSO_4$$
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none of the above
In presence of $$HCl(aq.);{H}_{2}S$$ gas results the precipitation of group-2 cations but not of group-4 cations during qualitative analysis. It is due to:
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Lower concentration of $${ S }^{ 2- }$$
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Higher concentration of $${ S }^{ 2- }$$
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Lower concentration of $${ H }^{ + } $$
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Higher concentration of $${ H }^{ + }$$
Explanation
Due to common ion effect, the ionisation of $${H}_{2}S$$ is suppressed and at low concentration of $${S}^{2-}$$ ions, the second group sulphides are precipitated.
Two swimmers, at opposite ends of a $$90$$ m pool, start to swim the length of the pool, one at the end rate of $$3$$ m per second, the other at $$2$$ m per second. They swim back and forth for $$12$$ minutes. Allowing no loss of time at the turns, find the number of times they pass each other.
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$$24$$
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$$21$$
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$$20$$
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$$19$$
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$$18$$
Explanation
We graph the position of each swimmer with respect to time [this graph ends with $$t = 3$$ (minutes)].
At the end of $$3$$ minutes they are back to their original positions, so that in 12 minutes this cycle is repeated four times. Since there are five meetings in this cycle, the total number of meetings is $$4\times 5 =20$$.
Fill in the blanks from the alternatives given in the brackets.
Random sampling is sampling by _________.
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chance
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choice
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purpose
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quota
The Additive Model of a time series is expressed as :
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$$Y_{t} = T_{t} \times C_{t} \times S_{t} \times R$$
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$$Y_{t} = T_{t} - C_{t} - S_{t} - R_{t}$$
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$$Y_{t} = T_{t} + C_{t} + S_{t} + R_{t}$$
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$$Y_{t} = T_{t}\cap C_{t} \cup S_{t} \cup R_{t}$$
Sun temple is situated in which of the following States>
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Assam
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Odisha
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Jammu and Kashmir
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Madhya Pradesh
The extreme values of the classes are called _________.
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class-mark
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tally mark
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class-limit
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class-frequency
________ is the difference between the upper and the lower limit of the class.
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Class Interval
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Class Tally
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Class Frequency
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Class Mark
Explanation
The difference between the upper and lower limit of class is the class interval.
Example class interval 10-20, here 10 is the lower limit and 20 is the upper limit.
A specific characteristic of a population is known as a __________.
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Sample
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Parameter
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Statistic
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Descriptive statistic
Time series is an important statistical technique which is widely used by __________.
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business executives
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financial analysts
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economists
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all of above
The maximum value a correlation coefficient can have is
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0
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-1
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1
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0.1
Lottery method is an example of _______ sampling.
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deliberate
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random
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census
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None of these
Isopropylamine can be obtained by
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$${\left( {C{H_3}} \right)_2}C = O + N{H_3} \to ?$$
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$${\left( {C{H_3}} \right)_2}CO + N{H_3}$$
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$${\left( {C{H_3}} \right)_2}CH - Br + NaN{H_2} \to $$
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$${\left( {C{H_3}} \right)_2}CH - Br?$$
Prussian blue colour is obtained by mixing together an aqueous solution of $$ Fe^{3+} $$ salt with:
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ferricyanide
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ferrocyanide
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hydrogen cyanide
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sodium cyanide
Explanation
Potassium ferricyanide reacts with ferrous iron in an acidic solution to produce the insoluble blue pigment, commonly referred to as Turnbull's blue or Prussian blue. To detect ferric $$(Fe^{+3})$$ iron, potassium ferrocyanide is used instead in the Perls' Prussian blue staining method.
$$\mathbf{Hence\ the\ correct\ answer\ is\ option\ (B).}$$
Which of the following reagents is used for the separation of acetaldehyde from acetophenone?
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$$ NH_2OH $$
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$$ NaOHI_2 $$
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$$ NaHSO_3 $$
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$$ C_6H_5NHNH_2 $$
Explanation
$$Acetaldehyde (CH_{3}CHO)$$
$$Acetophenone(C_{6}H_{5}C(O)CH_{3})$$
$$A)NH_{2}OH$$ is Hydroxylamine which is a derivative of ammonia which gives nuclear fuse addition reaction with the elimination of water. It reacts with both Acetaldehyde and Acetophenone.
$$B)NaOHI_{2}$$ is a carbon compound test which gives the carbon compound having $$COCH_{3}$$ group. Both Acetaldehyde and Acetophenone has $$COCH_{3}$$ group
$$C)NaHSO_{3}$$ reacts with acetaldehyde to form an addition compound which is precipitated. Acetaldehyde can be recovered with dilute $$HCl$$. Acetophenone does not react.
$$D)C_{6}H_{5}NHNH_{2}$$ is an ammonium derivative known as phenylhydrazine
which gives nuclear fuse addition reaction with the elimination of water. It reacts with both Acetaldehyde and Acetophenone.
$$\mathbf{Hence\ the\ correct\ answer\ is\ option\ (C).}$$
The Multiplicative Model of a time series is expressed is :
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$$Y_{t} = T_{t} \times C_{t} \times S_{t} \times R$$
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$$Y_{t} = T_{t} - C_{t} - S_{t} - R_{t}$$
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$$Y_{t} = T_{t} + C_{t} + S_{t} + R_{t}$$
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$$Y_{t} = T_{t}\cap C_{t}\cup S_{t} \cup R_{t}$$
In Lassaigne's method organic compound is fused with:
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sodium metal
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zinc dust
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sodium caronate and zinc dust
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calcium metal
Explanation
$$N,S,$$ halogens and phosphorus present in an organic compound are detected by Lassaigne's test, by fusing the compound with sodium $$(N_{a})$$ metal, which converts the elements present in the compound from covalent to ionic form.
$$Na+C+N\overset{\Delta }{\rightarrow}NaCN$$
$$2Na+S\overset{\Delta }{\rightarrow}Na_{2}S$$
$$2Na+X\overset{\Delta }{\rightarrow}NaX\ (X=Cl, \ Br \ or \ I)$$
Chromyl chloride gives yellow ppt. when it reacts with respectively_________
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$$Cu(OH)_2,PbNO_3$$
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$$NaOH,(CH_2COO)_2Ca$$
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$$NaOH,(CH_3COOO)_2Pb$$
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$$KOH,PbSO_4$$
Explanation
$$CrO_2Cl_2+4NaOH\rightarrow Na_2CrO_4+2NaCl+2H_2O$$
Chromyl chloride
$$Na_2CrO_4+(CH_3COO)_2Pb\rightarrow PbCrO_4+2CH_3COONa$$
yellow ppt
Option C is correct.
To prevent frauds in multiple mortgage cases, under SARFAESI Act, 2002, one special thing has been created and made operative from 01-04-Which one is that from the following?
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Special Register Office at Lucknow
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Special Central Arbitration Bureau at Lucknow
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Central SARFAESI Tribunals at six centres
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Central Electronic Registry
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