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what are antifertility drugs ? and y do we need it ?

Calculate the electronegativity of Chlorine from bond energy of Cl – F bond (61 kcal mol

^{−1}) F−F (38 kcal mol^{−1}) and Cl−Cl bond (58 kcal mol^{−1}) and electronegativity of fluorine 4.0 eVWhich is the best working model for a chemistry exhibition based on chemistry in our life??

artificial rain is caused by spraying salts over clouds. explain?

_{2}O_{2}solution , 15 volume of H_{2}O_{2}solution and 50 volume of H_{2}O_{2}solution " ? Pleaase answer with full explanation and examples if possible.(1) ${N}_{A}$

(2) 1.2 ${N}_{A}$

(3) 1.1 ${N}_{A}$

(4) 11 ${N}_{A}$

please suggest good investigatory projects in biology and chemistry for class 12 (cbse)

Q. Total vapour pressure of mixture of 1 mol X (${P}_{X}^{\xb0}$= 150 torr) and 2 mol Y (${P}_{Y}^{\xb0}$ = 300 torr) is 240 torr. In this case :-

(1) There is a neagative deviation from Raoult's law

(2) There is a positive deviation from Raoult's law

(3) There is no deviation from Raoult's law

(4) Can not be decided

What are biodegradable and non-biodegradable detergents? Give one example of each.

_{8}H_{7}SO_{3}Na (Molecular weight =206). What would be the maximum uptake of Ca^{2}^{+ }ions by the resin when expressed in mole per gram resin?What are the main constituents of dettol?

Q.In which of the excitation state of chlorine ClF_{3}is formed:-(1) In ground state

(2) In third excitation state

(3) In first excitation state

(4) In second excitation state in of

Examples of Antifertility drugs

Q.4.Which is not an exception to octet rule ?

(1) $B{F}_{3}$

(2) $SnC{l}_{4}$

(3) $Be{I}_{2}$

(4) $Cl{O}_{2}$

_{2}O_{4}(g) $\rightleftharpoons $2NO_{2}(g), the degree of dissociation ($\alpha $) in terms of K_{p}and total equilibrium pressure P is:-(1) $\alpha =\sqrt{\frac{4P+{K}_{p}}{{K}_{p}}}$ (2) $\alpha =\sqrt{\frac{{K}_{p}}{4P+{K}_{p}}}$ (3) $\alpha =\sqrt{\frac{{K}_{p}}{4P}}$ (4) $\alpha =\sqrt{\frac{{K}_{p}}{2P}}$

why do soaps not work in hard water ?

Q28. Which oxide of Nitrogen is most stable :-

$\left(1\right)2{{\mathrm{NO}}_{2}}_{\left(\mathrm{g}\right)}\underset{}{\rightleftharpoons}{\mathrm{N}}_{2\left(\mathrm{g}\right)}+2{\mathrm{O}}_{2\left(\mathrm{g}\right)}\phantom{\rule{0ex}{0ex}}\mathrm{K}=6.7\times {10}^{16}\mathrm{mol}{\mathrm{L}}^{\u20131}\phantom{\rule{0ex}{0ex}}\phantom{\rule{0ex}{0ex}}\left(2\right)2{\mathrm{NO}}_{\left(\mathrm{g}\right)}\underset{}{\rightleftharpoons}{\mathrm{N}}_{2\left(\mathrm{g}\right)}+{\mathrm{O}}_{2\left(\mathrm{g}\right)}\phantom{\rule{0ex}{0ex}}\mathrm{K}=2.2\times {10}^{30}\phantom{\rule{0ex}{0ex}}\phantom{\rule{0ex}{0ex}}\left(3\right)2{\mathrm{N}}_{2}{\mathrm{O}}_{5\left(\mathrm{g}\right)}\underset{}{\rightleftharpoons}2{\mathrm{N}}_{2\left(\mathrm{g}\right)}+5{\mathrm{O}}_{2\left(\mathrm{g}\right)}\phantom{\rule{0ex}{0ex}}\mathrm{K}=1.2\times {10}^{34}{\mathrm{mol}}^{5}{\mathrm{L}}^{\u20135}\phantom{\rule{0ex}{0ex}}\phantom{\rule{0ex}{0ex}}\left(4\right)2{\mathrm{N}}_{2}{\mathrm{O}}_{\left(\mathrm{g}\right)}\underset{}{\rightleftharpoons}2{\mathrm{N}}_{2\left(\mathrm{g}\right)}+{\mathrm{O}}_{2\left(\mathrm{g}\right)}\phantom{\rule{0ex}{0ex}}\mathrm{K}=3.5\times {10}^{33}\mathrm{mol}{\mathrm{L}}^{\u20131}\phantom{\rule{0ex}{0ex}}\phantom{\rule{0ex}{0ex}}\phantom{\rule{0ex}{0ex}}$

detergents are non biodegradable while soaps are biodegradable comment?

study of effect of potassium bisulphite as food preservative under various condition

which class of drugs do sleeping pills belong to?

limited spectrum antibiotics? with eg.

Q.6. $2{A}_{\left(g\right)}+{B}_{\left(g\right)}\rightleftharpoons $ Product is an elementary reaction, If pressure is increased three times of the initial pressure, the velocity of forward reaction will be ____ of the previous velocity :-

(1) 9 times

(2) 27 times

(3) $\frac{1}{9}$ times

(4) $\frac{1}{27}$ times

For the project on preparation of soyabean milk and its comparison with soyabean milk, what are the observations for the following table? I need it as soon as possible. Thank you

Type of milk Beaker no. Temperature Quality of curd Taste of curd

Soya bean milk 1 30C

2 40C

3 50C

Buffalo milk 1 30C

2 40C

3 50C

Q.1. Which of the species follows octet rule:

(1) $IB{r}_{5}$

(2) ${N}^{3-}$

(3) $S{F}_{4}$

(4) $P{b}^{+4}$

what are the limitations of soap?

(1) ${\mathrm{NO}}_{2}^{+},{\mathrm{NO}}_{2},{\mathrm{NO}}_{2}^{-}$ (2) ${\mathrm{ClO}}_{4}^{-},{\mathrm{SF}}_{4},{\mathrm{XeF}}_{4}$

(3) ${\mathrm{NH}}_{4}^{+},{\mathrm{H}}_{3}{\mathrm{O}}^{+},{\mathrm{OF}}_{2}$ (4) ${\mathrm{SO}}_{4}^{-2},{\mathrm{PO}}_{4}^{-3},{\mathrm{ClO}}_{4}^{-}$

what is the importance of chemistry in everyday life?

A-8. A sample of ${O}_{2}$ gas is collected over water at $23\xb0C$ at a barometric pressure of 751 mm Hg (vapour pressure of water at $23\xb0C$ is 21 mm Hg). The partial pressure of ${O}_{2}$ gas in the sample collected is

(1) 21 mm Hg (2) 751 mm Hg (3) 0.96 atm (4) 1.02 atm

Why do soaps not work in hard water?

Q.3. The strongest covalent bond is formed by the overlap of- (If considering for same shell)

(1) s and p orbitals

(2) s and s orbitals

(3) p and d orbitals

(4) p and p collateral orbitals

a) mononitration of 3-methylphenol

b) dinitration of 3-methylphenol

c) mononitration of pheny ethanoate

Name one substance which act as both:- Analgesic and Antipyretic

Q).* How many electrons should ${X}_{2}{H}_{4}$ liberate so that in the new compound X shows oxidation number $-\raisebox{1ex}{$1$}\!\left/ \!\raisebox{-1ex}{$2$}\right.(E.N.XH)$

(1) 10

(2) 4

(3) 3

(4) 2

Name a substance which can be used as an antiseptic as well as disinfectant.

what is wolf kishner reduction reaction?

What are artificial sweetening agents? Give two examples.

(b)Write the mechanism of reaction of HI with methoxymethane?

Write composition of dettol?

^{+}+ 2NH_{3}$\underset{}{\rightleftharpoons}$ Ag (NH_{3})_{2}^{+}at 298 K molar concentration of Ag^{+ }, Ag(NH_{3})_{2}^{+}_{}and NH_{3}is 10^{-1}, 10^{-1}, and 10^{3}. The value of K_{c}at 298 K for this equilibrium :-(1) 10

^{-6}(2) 10^{6}(3) 2 $\times $ 10^{-3}(4) 2 $\times $ 10^{6}(isotopes are not considered) is –

(1) 100 (2) 80 (3) 68 (4) 70

Name the macromolecules that are chosen as drug targets.

Q7.* Oxidation state of nitrogen is incorrectly given for :

Compound Oxidation State(1) [Co(NH

_{3})_{5}Cl]Cl_{2}_{ }– 3(2) NH

_{2}OH – 2(3) (N

_{2}H_{5})_{2}SO_{4}+ 2(4) Mg

_{3}N_{2}_{ }– 3what are antipyretics?

what's the difference between Antiseptic and disinfectant...???

Q3. If the z-axis is taken as the internuclear axis, then which of the following combinations of atomic orbitals is a nonbonding combination ?

(1) s and P

_{y}(2) P_{x}and d_{y}(3) P_{x}and P_{y}(4) all of theseQ3. For the equilibrium C(s) + CO

_{2}(g) $\underset{}{\overset{}{\rightleftharpoons}}$2CO(g) K_{P}= 63 atm at 1000 K. If at equilibrium ${\mathrm{P}}_{\infty}=10{\mathrm{P}}_{{\mathrm{co}}_{2}}\mathrm{then}\mathrm{total}$ pressure at equilibrium is :-(1) 6.30 atm (2) 0.693 atm (3) 6. 93 atm (4) 69.3 atm

Iodoform has antiseptic properties. Give one reason to support this.

Q49. X

_{2}+ Y_{2}$\underset{}{\rightleftharpoons}$2XY reaction was studied at a certain temperature. In the beginning 1 mole of X_{2}was taken in a one litre flask and 2 moles of Y_{2}was taken in another 2 litre flask. What is the equilibrium concentration of X_{2}and Y_{2}? (Given equilibrium concentration of [XY] = 0.6 mol L^{–1}).$\left(1\right)\left(\frac{1}{3}-0.3\right),\left(\frac{2}{3}-0.3\right)\phantom{\rule{0ex}{0ex}}\phantom{\rule{0ex}{0ex}}\left(2\right)\left(\frac{1}{3}-0.6\right),\left(\frac{2}{3}-0.6\right)\phantom{\rule{0ex}{0ex}}\phantom{\rule{0ex}{0ex}}\phantom{\rule{0ex}{0ex}}\left(3\right)\left(1-0.3\right),\left(2-0.3\right)\phantom{\rule{0ex}{0ex}}\phantom{\rule{0ex}{0ex}}\left(4\right)\left(1-0.6\right),\left(2-0.6\right)$

Is saponification similar to emulsification of fats?

^{+}ion ?(1) 3R (2) 1/3R (3) 4/4R (4) None of these

Discuss the two ways in which drug prevent attachment ofsubstrate on active site of enzyme.

what is mean by potent vasodilator

scouring means?abrasive means?

Q.4. When ${H}_{2}$ reacts with Na, it acts as ?

(1) Oxidising agent

(2) Reducing agent

(3) Both

(4) None

why one should not take aspirin empty stomach?

(1) Os

(2) Ru

(3) Both (1) and (2)

(4) None

A doctor advised a person suffering from high blood pressure to take less quantity of common salt. Explain.

name a food preservative which is most commonly used in food products?

what type of linkage holds together the monomers of DNA ?

Q33. Effect of increasing temperature on equilibrium constant is given by log K

_{2}– log K_{1}= $\frac{\u2206\mathrm{H}}{2.303\mathrm{R}}\left[\frac{1}{{\mathrm{T}}_{2}}-\frac{1}{{\mathrm{T}}_{1}}\right]$. Then for an endothermic reaction the false statement is :-(1) $\left[\frac{1}{{\mathrm{T}}_{2}}-\frac{1}{{\mathrm{T}}_{1}}\right]$ = positive (2) log K

_{2}> log K_{1}(3) $\u2206\mathrm{H}$= positive (4) K

_{2}> K_{1}Why is use of aspartame limited to cold foods?

Q. In the protonation of NH

_{3}molecule, following statement is true:-(1) A covalent bond is formed (2) Hydrogen bond is formed

(3) Hybridisation state of N is changed (4) Shape of NH

_{3}molecule is changedproject work

topic : hard water analysis

how do we use EDTA solution for titrating it with diferent samples of water ?

Q.46. In the reaction $2P\left(g\right)+Q\left(g\right)\rightleftharpoons 3R\left(g\right)+S\left(g\right)$. If 2 mol each of P and Q taken initially in a 1 L flask. At equilibrium which is true:-

(1) [P] < [Q]

(2) [P] = [Q]

(3) [Q] = [R]

(4) None of these

hey i need to make a project on the topic-to detect the presence of adulterants in sugar.

please provide me articles related with the topic as soon as possible..

How are synthetic detergents better than soap?

Q24* In the reaction : A

^{–n2}^{ }+ xe^{–}^{ }$\to $A^{–n1}, here x will be(1) n

_{1}+ n_{2}(2) n_{2}– n_{1}(3) n_{1}– n_{2}(4) n_{1}. n_{2}Why do we require artificial sweetening agents?

Q.26. $C{H}_{3}CHOandC{H}_{3}COC{H}_{3}$ can not be distinguished by :-

(1) Fehling solution

(2) Grignard reagent

(3) Schiffs reagent

(4) Tollen's reagent

give me some ideas for chemistry investigatory projects>>>>

Q. In which of the following compounds iron has lowest oxidation state ?

$1.FES{O}_{4}(N{H}_{4}{)}_{2}S{O}_{4}.6{H}_{2}O\phantom{\rule{0ex}{0ex}}2.{K}_{4}Fe(CN{)}_{6}\phantom{\rule{0ex}{0ex}}3.Fe{\left(CO\right)}_{5}\phantom{\rule{0ex}{0ex}}4.F{e}_{0.94}O$

How do antiseptics differ from disinfectants? Give one example of each.

what is the foaming capacity of jeeva, lux breeze , dettol , cinthol when 5gm soap sample ,50ml water , 1ml soap solution , 10ml water is used ? please give immediate reply .

_{3}gives 'B' which on heating gives 'C'. 'C' when treated with Br_{2}in the presence of KOH produces ethylamine. Compound 'A' is:-(1) CH

_{3}CH_{2}COOH(2) CH

_{3}COOH(3) CH

_{3}CH_{2}CH_{2}COOH(4)

what is the chemical responsible for the antiseptic properties of dettol. how they are effective as antiseptic???