1 Hydrogen
H2O2 acts as an oxidising agent in:
1) neutral medium 2) acidic medium 3) alkaline medium 4) acidic as well as alkaline medium
Because the oxidation state of oxygen in $${ H }_{ 2 }{ O }_{ 2 }$$ is $$-1$$ which can be oxidized to $$'O'$$ oxidation state by removing an $${ e }^{ - }$$ or else can be reduced by adding an $${ e }^{ - }$$ and oxidation state would be reduced to $$-2$$ oxidizing agent means oxidizing others itself getting reduced.
2 Basic Principles of Organic Chemistry
The IUPAC name of 1) 5−Oxo−4−hydroxy−2−pentanone 2) 4−Hydroxy−5−al−2−Pentanone 3) 2−Hydroxy−4−Oxopentanal 4) 1−Al−4−Oxo−2−Pentanol
SOLUTION
Aldhyde behaves as a functional group and numbering starts from terminal functional group.
2−Hydroxy−4−Oxopentanal
3 Basic Principles of Organic Chemistry
The number of optical isomers formed by hydrogenation of the compound, (CH3)2C = CHCH3 are 1) 1 2) 2 3) 3 4) zero
(CH3)2C = CHCH3?(CH3)2CH−CH2CH3
The reduced product does not contain a chiral carbon atom and hence is optically inactive. so it is zero.
4 General Principles & Process of Isolation of Metals
In blast furnace, the highest temperature is in :
1) slag zone 2) reduction zone 3) combustion zone 4) fusion zone
5 Surface Chemistry
The volume of gases H2, CH4, CO2 and NH3 adsorbed by 1g of charcoal at 288K are in the order:
1) H2 >CH4 > CO2 > NH3 2) CH2 > CO2 > NH3 > H2 3) CO2 > NH3 > H2 > CH2 4) NH3 > CO2 > CH4 > H2
NH3 > CO2 > CH4 > H2
6 Chemistry in Everyday Life
A synthetic material used for washing clothes, even when water is hard is:
1) detergent
2) soap
3) shampoo
4) facewash
Detergent is used for both surface activity and cleansing action. Detergents are made of Alkylbenzene sulfonates, which help cleansing action in hard water.
7 P – Block Elements
What is the oxidation state of nitrogen in N2?O5?? 1) 5 2) 10 3) 4 4) 3
Let the oxidation state of N be x. Oxidation state of O is −2 as it is in oxide form.
⇒2x+5(−2)=0
⇒x=10 /2?=+5
8 D and F Block Elements
Silver iodide is used for producing artificial rain because AgI
1) is insoluble in water
2) has crystal structure similar to ice
3) is easy to spray at high altitude
4) is easy to synthesize
Solution
Silver iodide is used for producing artificial rains because it has a crystal structure similar to ice. When AgI is sprayed over clouds it causes water droplets of clouds to coalesce to form bigger water drops and induce rains.
9 Chemical Bonding and Molecular Structure
According to MO theory which of the list ranks the oxygen species in terms of increasing bond order $$O_2^{2 - },\,O_2^ + ,O_2^ - \,,\,O_2^{2 - }$$ 1) $$O_2^{2 - },\,O_2^ - ,O_2^ + \,,\,{O_2}$$ 2) $$O_2^ + ,\,{O_2},O_2^ - \,,\,O_2^{2 - }$$ 3) $${O_2},\,{O_2},O_2^ + \,,\,O_2^{2 - }$$ 4) $$O_2^{2 - },\,O_2^ - ,{O_2}\,,\,O_2^ + $$
According to MOT bond order is given by the formula:
where NA?, NB? are the number of electrons in antibonding and bonding
Bond order of the following is:
$$O_2^{2 - },\,O_2^ - ,{O_2}\,,\,O_2^ + $$
10 Electrochemistry
In producing chlorine through electrolysis 100 watt power at 125 V is being consumed. How much chlorine per minute is liberated ? Electrochemical Equivalent of chlorine is 0.367 × 10−6 kg/coulomb: 1) 21.3 mg 2) 17.6 mg 3) 24.3 mg 4) 13.6 mg
SOLUTION Power consumed in electrolysis =100 W
Current in flow in this solution, i=100 / 125=0.8 A
According to first law of Faraday's law
M=ZQ and Q=it
So,
M=Zit
Z=0.367×10−6; i=0.8 A;t=60 s = =17.6 mg
Your Score:
where NA?, NB? are the number of electrons in antibonding and bonding 