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Published on: 24/05/2021
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Download CBSE Class 12th Standard CBSE Chemistry question papers, sample papers, important questions, and previous year solved papers in PDF format. Get free study materials, NCERT solutions, and exam preparation resources for Class 12th Standard CBSE Chemistry
Questions + Answers key
Take MCQ Chemistry Test
1.
Write one chemical reaction to show that conc. H2SO4 can act as an oxidising agent.
2.
Write balanced chemical equation for the reaction : phosphorus is treated with concentrated nitric acid.
3.
Which is a stronger reducing agent, SbH3 or BiH3, and why?
4.
Which site of an enzyme is called allosteric site?
5.
What causes Brownian movement in a colloidal solution?
6.
What is a Gene?
7.
What causes the disease sickle cell anaemia ?
8.
What is invert sugar ?
9.
Explain why lanthanoids are paramagnetic in nature ?
10.
What is the oxidation state of Ni in Ni(CO)4 ?
11.
Write the chemical formula of nitropentaamminecobalt (III) chloride.
12.
Why does a transition series contain 10 elements ?
13.
What is 'Power alcohol'?
14.
What is the order of reactivity of HCl, HBr and Hl with alcohols?
15.
What is the condition to be satisfied for a compound to be chiral?
1.
( )
Hot concentrated sulphuric acid oxidises carbon to CO2.
\(C + 2\ H_2SO_4(conc.)\overset{\triangle}{\longrightarrow} CO_2+2\ SO_2+2\ H_2O\)
\(\)
2.
( )
Orthophosphoric acid is produced
\(P_4\ +\ 20\ HNO_3\ \rightarrow\ \underset {Orthophosphoric\ acid} {4\ H_3PO_4} +\ 20\ NO_2\ +\ 4\ H_2O\)
\(\)
3.
( )
As we move down the group 15 elements from Sb to Bi, the atomic size increase and hence the strength of the bond it makes with hydrogen decreases, i.e., Bi-H bond is weaker than Sb-H bond. In other words, BiH3 is thermally less stable than sbH3. Therefore, on heating, BiH3 has a greater tendency to liberate hydrogen than SbH3 is a stronger reducing agent than SbH3.
4.
( )
Sites different from active site of enzymes where a molecule can bind and affect the active site is called allosteric site.
5.
( )
It is due to unbalanced collision between colloidal particles and with the particles of dispersion medium.
6.
The segment of DNA molecule which codes for a specific protein or polypeptide is called a gene.
7.
Defective haemoglobin which is produced due to replacement of one amino acid, i.e., glutamic acid by valine.
8.
An equimolar mixture of glucose and dructose, obtained by hydrolysus of surcose in pressure of an acid such as dil. HCI or the enzyme invertase, is surcrase, is called invert sugar.
9.
All lanthanoids expect La3+ and Lu3+ contain unpaired electrons and hence are paramagnetic.
10.
zero
11.
\(\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_5\left(\mathrm{NO}_2\right)\right] \mathrm{CI}_2\)
12.
There are five d - orbitals in an energy level and each orbital can have two electrons. As we move from one element to the next, an electron is added and for complete filling of the ive d orbitals, 10 electrons are required.
13.
A mixture of absolute alcohol (20%), petrol (80%) and some benzene as a cosolvent is called power alcohol.
14.
Reactivity decreases as the strength of the H--X bond increases,i.e, Hl > HBr > HCl
15.
Its mirror image should be non-superimposable.
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