SRM University

Q&A - Ask Doubts and Get Answers

Sort by :
Q
Engineering
83 Views   |   2 months ago

The most popularly known blood grouping is the ABO grouping. It is named ABO and not ABC, because "O" in it refers to having:

  • Option 1)

    overdominance of this type on the genes for A and B types

  • Option 2)

    one antibody only - either anti-A or anti-B on the RBCs

  • Option 3)

    no antigens A and B on RBCs

  • Option 4)

    other antigens besides A and B on RBCs

 

View All Answers (4)

N Neha Gupta
Answered 1 month, 2 weeks ago
Engineering
56 Views   |   5 months, 3 weeks ago

The Gibbs energy for the decomposition of Al2O3 at 500oC is as follows:

\frac{2}{3}\text{Al}_{2}\text{O}_{3}\rightarrow \frac{4}{3}\text{Al}+\text{O}_{2};

\Delta_{\text{r}}\text{G}=+960 \text{kJ} \text{mol}^{-1}.

The potential difference needed for the electrolytic reduction of aluminium oxide (Al2O3) at 500oC is at least:

  • Option 1)

    3.0 V

  • Option 2)

    2.5 V

  • Option 3)

    5.0 V

  • Option 4)

    4.5 V

 
Engineering
41 Views   |   5 months, 3 weeks ago

The enthalpy of fusion of water is 1.435 kcal/mol. The molar entropy change for the melting of ice at 0°C is :

  • Option 1)

    10.52 cal / (mol K)

  • Option 2)

    21.04 cal / (mol K)

  • Option 3)

    5.260 cal / (mol K)

  • Option 4)

    0.526 cal / (mol K)

 
Engineering
50 Views   |   5 months, 3 weeks ago

In which of the following reactions, standard reaction entropy change (\DeltaS°) is Positive and standard Gibbs energy change (\DeltaG°) decreases sharply with increasing temperature?

  • Option 1)

    \text{C}\ \text{graphite}+\frac{1}{2}\text{O}_{2(\text{g})}\rightarrow \text{CO}_{(\text{g})}

  • Option 2)

    \text{CO}_{(\text{g})}+\frac{1}{2}\text{O}_{2(\text{g})}\rightarrow \text{CO}_{2(\text{g})}

  • Option 3)

    \text{Mg}_{(\text{s})}+\frac{1}{2}\text{O}_{2(\text{g})}\rightarrow \text{MgO}_{(\text{s})}

  • Option 4)

    \frac{1}{2}\text{Cgraphite}+\frac{1}{2}\text{O}_{2(\text{g})}\rightarrow\frac{1}{2} \text{CO}_{2(\text{g})}

 
Engineering
57 Views   |   5 months, 3 weeks ago

Equal volumes of two monoatomic gases A and B, at same temperature and pressure are mixed. The ratio of specific heats (Cp/Cv) of the mixture will be:

  • Option 1)

    1.50

  • Option 2)

    3.3

  • Option 3)

    1.67

  • Option 4)

    0.83

 
Engineering
82 Views   |   6 months ago

Which of the following is/are the hazardous pollutants present in automobile exhaust gases?

1) N_{2}

2) CO

3) CH_{4}

4) Oxides of nitrogen

 

  • Option 1)

    2 & 3

  • Option 2)

    1 & 2

  • Option 3)

    2 & 4

  • Option 4)

    1 & 3

 

View All Answers (1)

A aadil.khan
Answered 5 months, 4 weeks ago
As we learned @1825   Co and oxides of nitrogen gases are emitted as a result of the combustion of fuels. Option 1) 2 & 3 Option 2) 1 & 2 Option 3) 2 & 4 Option 4) 1 & 3
Engineering
99 Views   |   7 months, 1 week ago

Which one of the alkali metals, forms only, the normal oxide, M_{2}O on heating in air?

  • Option 1)

    Rb

  • Option 2)

    K

  • Option 3)

    Li

  • Option 4)

    Na

 

View All Answers (2)

B balakrishnan m
Answered 7 months ago

Li

 

Engineering
104 Views   |   7 months, 1 week ago

Which of the following oxides is not expected to react with sodium hydroxide?

  • Option 1)

    C_{a}O

  • Option 2)

    S_{i}O_{2}

  • Option 3)

    B_{e}O

  • Option 4)

    B_{2}O_{3}

 

View All Answers (1)

V vakul.arora
Answered 7 months ago
As learnt Alkaline earth metals - Elements of Group 2 of the periodic table Be, Mg, Ca, Sr, Ba, Ra - wherein Their oxides are alkaline except Be    The oxides of alkaline earth metals are basic (except BeO) and basic oxides don't react with NaOH which also is basic. Option 1) This option is correct Option 2) This option is incorrect Option 3) This option is incorrect Option 4) This option...
Engineering
124 Views   |   7 months, 1 week ago

Structures of some common polymers are given. Which one is not correctly presented?

  • Option 1)

    Neoprene

  • Option 2)

    Terylene

  • Option 3)

    Nylon

  • Option 4)

    Teflon

 

View All Answers (1)

V vakul.arora
Answered 7 months ago
As we learnt in  Neoprene - - Formed by free radical polymerization of chloroprene ( 2-chloro-1, 3-butadiene ). - Homopolymer - wherein - Superior resistance to vegetable and mineral oils. - Used in manufacturing conveyor belts, gaskets, hoses.   Neoprene is a polymer of chloroprene. structure Option 1) Correct Option 2) Incorrect Option 3) Incorrect Option 4) Incorrect
Engineering
98 Views   |   7 months, 1 week ago

The number of octahedral void (s) per atom present in a cubic close-packed structure is:

  • Option 1)

    1

  • Option 2)

    3

  • Option 3)

    2

  • Option 4)

    4

 

View All Answers (1)

V vakul.arora
Answered 7 months ago
As learnt in Voids - Voids are empty spaces in a unit cell. They are of four types: triangular, tetrahedral, octahedral, cubic. -    We know that the no. of actohedral voids in a close packed structure = no. of atoms for a cubic close packed structure, no. of atoms = 1  octahedral voids = 1   Option 1) 1 this option is correct Option 2) 3 this option is incorrect Option 3) 2 this option is...
Engineering
173 Views   |   7 months, 1 week ago

The Number of Carbon atoms per unit cell of diamond unit cell is :

  • Option 1)

    8

  • Option 2)

    6

  • Option 3)

    1

  • Option 4)

    4

 

View All Answers (1)

A aadil.khan
Answered 7 months ago
As we learnt in  Diamond unit all is FCC with 4 atoms additionally bonded tetrahedrally which have full contribution to the all.  So, no.of atoms                               Option 1) 8 this option is correct Option 2) 6 this option is incorrect Option 3) 1 this option is incorrect Option 4) 4 this option is incorrect
Engineering
332 Views   |   7 months, 1 week ago

Lithium metal crystallises in a body centered cubic crystal. If the length of the side of the unit cell of lithium is 351 pm.the atomic radius of the lithium will be:

  • Option 1)

    151.8 pm

  • Option 2)

    75.5 pm

  • Option 3)

    300.5 pm

  • Option 4)

    240.8 pm

 

View All Answers (1)

P prateek
Answered 7 months ago
As learnt in Relation between radius of constituent particle, R and edge length, a for body centered cubic unit cell - -    for a BCC lattice, we know that   Option 1) 151.8 pm this option is correct Option 2) 75.5 pm this option is incorrect Option 3) 300.5 pm this option is incorrect Option 4) 240.8 pm this option is incorrect
Engineering
101 Views   |   7 months, 1 week ago

In Castner-Kellner cell for production of sodium hydroxide:

  • Option 1)

    Brine is electrolyzed with Pt electrodes

  • Option 2)

    Brine is electrolyzed using graphite electrodes

  • Option 3)

    Molten sodium chloride is electrolyzed

  • Option 4)

    Sodium amalgam is formed at mercury cathode

 

View All Answers (1)

P prateek
Answered 7 months ago
As we learnt in Preparation of NaOH by castner-Kellner cell - Also known as mercury cathode process by electrolysis of aq.solution of brine cathode:   Anode: - wherein Cell comprises of three compartments Outer compartment:Brine solution is electrolysed Central compartment: 2% NaOH solution and     In the Castner Kellner cell,  At cathode,  At anode,  Sodium Amalgam is formed at...
Engineering
142 Views   |   7 months, 1 week ago

Copper crystallises in a face-centered cubic lattice with a unit cell length of 361 pm.What is the radius of copper atom in pm?

  • Option 1)

    157

  • Option 2)

    181

  • Option 3)

    108

  • Option 4)

    128

 

View All Answers (1)

P perimeter
Answered 7 months ago
For an FCC lattice, we know  Option 1) 157 this option is incorrect Option 2) 181 this option is incorrect Option 3) 108 this option is incorrect Option 4) 128 this option is correct
Engineering
146 Views   |   7 months, 1 week ago

A metal crystallizes with a face-centered cubic lattice. The edge length of the unit cell is 408 pm. The diameter of the metal atom is:

  • Option 1)

    288 pm

  • Option 2)

    408 pm

  • Option 3)

    144 pm

  • Option 4)

    204 pm

 

View All Answers (1)

P Plabita
Answered 7 months ago
For an FCC, where r= radius of atom a= edge length Option 1) 288 pm This option is correct Option 2) 408 pm This option is incorrect Option 3) 144 pm This option is incorrect Option 4) 204 pm This option is incorrect
Engineering
118 Views   |   7 months, 1 week ago

What is the density of N_{2} gas at 227^{o}C and 5.00 atm pressure? (R=0.0821 atm K^{-1} mol^{-1})

  • Option 1)

    0.29 g/ml

  • Option 2)

    1.40 g/ml

  • Option 3)

    2.81 g/ml

  • Option 4)

    3.41 g/ml

 

View All Answers (1)

A aadil.khan
Answered 7 months ago
  Ideal Gas Law - - wherein P - Pressure V - Volume n - No. of Moles R - Gas Constant T - Temperature     Ideal Gas Law in terms of density - - wherein where d - density of gas P - Pressure R - Gas Constant T - Temperature M - Molar Mass      from ideal gas equation  Pv=nRT or PM=RT = Option 1) 0.29 g/ml This option is incorrect  Option 2) 1.40 g/ml This option is incorrect  Option 3) 2.81...
Engineering
251 Views   |   7 months, 1 week ago

Which condition is not satisfied by an ideal solution?

  • Option 1)

    \Delta _{mix}H=0

  • Option 2)

    \Delta _{mix}V=0

  • Option 3)

    \Delta _{mix}S=0

  • Option 4)

    Obeyance to Raoult's Law

 

View All Answers (1)

P prateek
Answered 7 months ago
As learnt Condition of ideality - Interaction between A - A; B - B are similar to A - B Interactions. eg. Hexane + Heptone Benzene + Toluere - wherein       Conditions for ideality for a solution are: Also, an ideal solution always Raoult's Law Option 1) This option is incorrect Option 2) This option is incorrect Option 3) This option is correct Option 4) Obeyance to Raoult's Law This...
Engineering
110 Views   |   7 months, 1 week ago

The values of \Delta H \ and \ \Delta S for the reaction, C_{\left ( graphite \right )}+CO_{2}_{\left ( g \right )}\rightarrow 2CO_{\left ( g \right )}  are 170kJ and 170JK^{-1}, respectively. The reaction will be spontaneous at

  • Option 1)

    910K

  • Option 2)

    1110K

  • Option 3)

    510K

  • Option 4)

    710K

 

View All Answers (1)

S subam
Answered 7 months ago
  Gibb's free energy (? G) -   - wherein Gibb's free energy enthalpy of reaction entropy temperature    For the reaction to be spontaneous given is -Ve only when which is possible only at ie. reaction will be spontaneous P= V=.03m3 P Option 1) 910K Incorrect Option Option 2) 1110K Correct Option Option 3) 510K Incorrect Option Option 4) 710K Incorrect Option
Engineering
710 Views   |   7 months, 1 week ago

A 0.0020 m aqueous solution of an ionic compound Co(NH3)5(NO2)Cl freezes at -0.00732°C. Number of moles of ions which 1 mol of ionic compound produces on being dissolved in water will be (Kf=-1.86°C/m)

  • Option 1)

    3

  • Option 2)

    4

  • Option 3)

    1

  • Option 4)

    2

 

View All Answers (1)

P Plabita
Answered 7 months ago
As we learned in concept Application of Vant Hoff factor - -     D+0.00732=+1.86x0.002xi   Option 1) 3 This option is incorrect. Option 2) 4 This option is incorrect. Option 3) 1 This option is incorrect. Option 4) 2 This option is correct.
Engineering
96 Views   |   7 months, 1 week ago

In which of the following reactions, standard entropy change \left ( \Delta S^{o} \right ) is positive and standard Gibb's energy change \left ( \Delta G^{o} \right ) decreases sharply with increasing temperature?

  • Option 1)

    C\ graphite+\frac{1}{2}O_{2}\left ( g \right )\rightarrow CO\left ( g \right )

  • Option 2)

    CO\left ( g \right )+\frac{1}{2}O_{2}\left ( g \right )\rightarrow CO_2\left ( g \right )

  • Option 3)

    Mg\left (s \right )+\frac{1}{2}O_{2}\left ( g \right )\rightarrow MgO\left ( s \right )

  • Option 4)

    \frac{1}{2}C\ graphite+\frac{1}{2}O_{2}\left ( g \right )\rightarrow \frac{1}{2}CO_2\left ( g \right )

 

View All Answers (1)

V vakul.arora
Answered 7 months ago
  Gibb's free energy (? G) -   - wherein Gibb's free energy enthalpy of reaction entropy temperature    C graphite + As amount of geseous substancance is increasing in product, thus is positive for this reaction, and we know that . As   is positive thus increase in tempreature will make more negative and will decrease. Option 1) Correct Option Option 2) Incorrect Option Option...
Exams
Articles
Questions