15280 + Interview Questions in Chemistry Page 49 InterviewSolution

2401.	pH of 0.2 M sodium acetate solution is (pKa of CH3COOH is 4.74)?
Answer» pH of 0.2 M sodium acetate solution is (pKa of CH3COOH is 4.74)?

Discussion

2402.	Out of the following options, which gases change the colour of damp red litmus paper?
Answer» Out of the following options, which gases change the colour of damp red litmus paper?

Discussion

2403.	The potential energy of a spring is (1/2)Kx²(k=Force constant).How did the equation come?
Answer» The potential energy of a spring is (1/2)Kx²(k=Force constant).How did the equation come?

Discussion

2404.	Just give the order of acidity in HCOOH, CH3COOH, Phenol, Benzoic acid, water
Answer» Just give the order of acidity in HCOOH, CH3COOH, Phenol, Benzoic acid, water

Discussion

2405.	Which of the following belong to same homologous series:C3H8, C3H6, C4H8, C4H6
Answer» Which of the following belong to same homologous series: C₃H₈, C₃H₆, C₄H₈, C₄H₆

Discussion

2406.	A mixture of Mn+2 and Zn2+ can be separated by using an excess of
Answer» A mixture of $M n^{+ 2} and Z n^{2 +}$ can be separated by using an excess of

Discussion

2407.	Write the observations, and balanced equations for the following reactions:(i) Sodium hydroxide is added dropwise to a solution of zinc sulphate, till it is in excess.(ii) Ammonium hydroxide is added first in a small quantity, and then in excess, to a solution of copper sulphate.(iii) Excess of ammonium hydroxide is added to a substance, obtained by adding hydrochloric acid to silver nitrate solution.(iv) Moist starch iodide paper is placed at the mouth of a test-tube containing chlorine gas.(v) A paper dipped in potassium permanganate solution is placed at the mouth of a test-tube, containing sulphur dioxide gas.
Answer» Write the observations, and balanced equations for the following reactions: (i) Sodium hydroxide is added dropwise to a solution of zinc sulphate, till it is in excess. (ii) Ammonium hydroxide is added first in a small quantity, and then in excess, to a solution of copper sulphate. (iii) Excess of ammonium hydroxide is added to a substance, obtained by adding hydrochloric acid to silver nitrate solution. (iv) Moist starch iodide paper is placed at the mouth of a test-tube containing chlorine gas. (v) A paper dipped in potassium permanganate solution is placed at the mouth of a test-tube, containing sulphur dioxide gas.

Discussion

2408.	In the laboratory preparation of hydrochloric acid, the reactants used are:
Answer» In the laboratory preparation of hydrochloric acid, the reactants used are:

Discussion

2409.	If a carbon compound has 4 carbon atoms in its skeletal and the 2nd carbon atom has a doubly bonded oxygen attached to it, what is it called?
Answer» If a carbon compound has 4 carbon atoms in its skeletal and the $2^{n d}$ carbon atom has a doubly bonded oxygen attached to it, what is it called?

Discussion

2410.	41. In a reaction 4A+2B+3C=A_4B_2C_3, what will be the no. Of moles of product formed when we stared with 1 mole A, 0.6 mole B and 0.72 mole C?
Answer» 41. In a reaction 4A+2B+3C=A_4B_2C_3, what will be the no. Of moles of product formed when we stared with 1 mole A, 0.6 mole B and 0.72 mole C?

Discussion

2411.	Match the following fractions with their equivalent fractional forms.
Answer» Match the following fractions with their equivalent fractional forms.

Discussion

2412.	Where does all the energy in living organisms originate from?
Answer» Where does all the energy in living organisms originate from?

Discussion

2413.	Difference between polar and non polar compound
Answer» Difference between polar and non polar compound

Discussion

2414.	Explain what is formic acid.explain its structure ( most stable),write the formula of it and write discription on it/explain about it breafly.
Answer» Explain what is formic acid.explain its structure ( most stable),write the formula of it and write discription on it/explain about it breafly.

Discussion

2415.	Name the salt which is used as a preservative in pickles, and in curing meat and fish.
Answer» Name the salt which is used as a preservative in pickles, and in curing meat and fish.

Discussion

2416.	Question 38Explain some harmful effects of agricultural practices on the environment.
Answer» Question 38 Explain some harmful effects of agricultural practices on the environment.

Discussion

2417.	Name the property by which the following objects appear shiny.
Answer» Name the property by which the following objects appear shiny.

Discussion

2418.	17.BeC2 +H2O on heating . Is there is prodution of methane . Give me the reaction
Answer» 17.BeC2 +H2O on heating . Is there is prodution of methane . Give me the reaction

Discussion

2419.	MnO4−+8H++5e−→Mn2++4H2O Eo =1.51 VThe quantity of electricity required in Faraday to reduce five moles of MnO−4 is ____.
Answer» $M n {O_{4}}^{-} + 8 H^{+} + 5 e^{-} \to M n^{2 +} + 4 H_{2} O E^{o} = 1.51 V$ The quantity of electricity required in Faraday to reduce five moles of $M n O_{4}^{-}$ is ____.

Discussion

2420.	Why selectivity ratio is maximum for bromine that of chlorine
Answer» Why selectivity ratio is maximum for bromine that of chlorine

Discussion

2421.	In which of the following molecule/ion all the bonds are not equal? (1) XeF4 (2) BF4-1 (3) C2H4 (4) SiF4
Answer» In which of the following molecule/ion all the bonds are not equal? (1) XeF4 (2) BF4-1 (3) C2H4 (4) SiF4

Discussion

2422.	What is difference between ionization enthalpy and electron gain enthalpy and their trends in periodic table with justification?
Answer» What is difference between ionization enthalpy and electron gain enthalpy and their trends in periodic table with justification?

Discussion

2423.	Is their any trick for learning reactivity series of metal
Answer» Is their any trick for learning reactivity series of metal

Discussion

2424.	Prove that - cos20 cos100 + cos100 cos140 - cos140 cos200 =-3/4
Answer» Prove that - cos20 cos100 + cos100 cos140 - cos140 cos200 =-3/4

Discussion

2425.	Associez un problème à une solution.1. J'ai faim (a) Il prend une asprine.2. Il a mal à la tête (b) Il va chez le médecin.3. Elle a sommeil (c) Ils mangent de la glace.4. Il a mal au dos (d) Elle va dormir.5. Marc a froid (e) Je mange une pomme.6. Ils ont soif (f) Il applique une pommade.7. Ils ont chaud (g) Ils boivent de l'eau.8. Gaston a mal au ventre (h) Il porte un chandail.
Answer» Associez un problème à une solution. 1. J'ai faim (a) Il prend une asprine. 2. Il a mal à la tête (b) Il va chez le médecin. 3. Elle a sommeil (c) Ils mangent de la glace. 4. Il a mal au dos (d) Elle va dormir. 5. Marc a froid (e) Je mange une pomme. 6. Ils ont soif (f) Il applique une pommade. 7. Ils ont chaud (g) Ils boivent de l'eau. 8. Gaston a mal au ventre (h) Il porte un chandail.

Discussion

2426.	The metal that cannot liberate hydrogen with dilute acids is
Answer» The metal that cannot liberate hydrogen with dilute acids is

Discussion

2427.	Why does pH depend on temperature?
Answer» Why does pH depend on temperature?

Discussion

2428.	Why is in water 1 litre of water is equal to 1 kilogram of water?
Answer» Why is in water 1 litre of water is equal to 1 kilogram of water?

Discussion

2429.	If the set up has been immersed in water, what has changed?
Answer» If the set up has been immersed in water, what has changed?

Discussion

2430.	Explain the formation of an ionic compound between metal and a non-metal by transfer of electrons with Mg as the metal and Cl as a non-metal to illustrate your answer.
Answer» Explain the formation of an ionic compound between metal and a non-metal by transfer of electrons with Mg as the metal and Cl as a non-metal to illustrate your answer.

Discussion

2431.	Total number of geometrical isomers for the complex[RhCl(CO)(PPh3)(NH3)] is
Answer» Total number of geometrical isomers for the complex $[R h C l (C O) (P P h_{3}) (N H_{3})]$ is

Discussion

2432.	Non-metallic character ___ from left to right in a period.
Answer» Non-metallic character ___ from left to right in a period.

Discussion

2433.	Arrange the following elements in the order of their abundance in Earth's crust.Aluminium - Al, Silicon - Si, Oxygen - O, Iron - Fe.
Answer» Arrange the following elements in the order of their abundance in Earth's crust. Aluminium - $A l$ , Silicon - $S i$ , Oxygen - $O$ , Iron - $F e$ .

2433.

Arrange the following elements in the order of their abundance in Earth's crust.Aluminium - Al, Silicon - Si, Oxygen - O, Iron - Fe.

Answer»

Arrange the following elements in the order of their abundance in Earth's crust.

Aluminium - $A l$ , Silicon - $S i$ , Oxygen - $O$ , Iron - $F e$ .

Discussion

2434.	How can you prove that hydrochloric acid contains(i) hydrogen,(ii) chlorine?
Answer» How can you prove that hydrochloric acid contains (i) hydrogen, (ii) chlorine?

Discussion

2435.	The c-c and si-c interatomic distances are 154pm and 188pm. The atomic radius of Si is?
Answer» The c-c and si-c interatomic distances are 154pm and 188pm. The atomic radius of Si is?

Discussion

2436.	Why is titanium called a strategic metal? Mention two of its properties which make it so special.
Answer» Why is titanium called a strategic metal? Mention two of its properties which make it so special.

Discussion

2437.	The ability of metals by which they can be beaten into thin sheets is called _______.
Answer» The ability of metals by which they can be beaten into thin sheets is called _______.

Discussion

2438.	Is the pH of baking soda solution is lesser than or greater than 7 ?Give reason
Answer» Is the pH of baking soda solution is lesser than or greater than 7 ?Give reason

Discussion

2439.	how can vaderwaal cons†an t (a) and (b) can be determined for He,H2,Co2,O2,Ch4,H2,
Answer» how can vaderwaal cons†an t (a) and (b) can be determined for He,H2,Co2,O2,Ch4,H2,

Discussion

2440.	In the three different Lewis dot structures shown below, the dots around each atom represent
Answer» In the three different Lewis dot structures shown below, the dots around each atom represent

Discussion

2441.	Two metals A and B have E∘=−0.76 and +0.80 V, respectively. Which will liberate H2 from H2SO4 ? Given, For A ; An++ne−→A E∘=−0.76 V For B ; Bn++ne−→B E∘=+0.80 V
Answer» Two metals A and B have $E^{\circ} = - 0.76$ and $+ 0.80 V$ , respectively. Which will liberate $H_{2}$ from $H_{2} S O_{4}$ ? Given, For A ; $A^{n +} + n e^{-} \to A$ $E^{\circ} = - 0.76 V$ For B ; $B^{n +} + n e^{-} \to B$ $E^{\circ} = + 0.80 V$

2441.

Two metals A and B have E∘=−0.76 and +0.80 V, respectively. Which will liberate H2 from H2SO4 ? Given, For A ; An++ne−→A E∘=−0.76 V For B ; Bn++ne−→B E∘=+0.80 V

Answer»

Two metals A and B have $E^{\circ} = - 0.76$ and $+ 0.80 V$ , respectively. Which will liberate $H_{2}$ from $H_{2} S O_{4}$ ?

Given,

For A ; $A^{n +} + n e^{-} \to A$
$E^{\circ} = - 0.76 V$
For B ; $B^{n +} + n e^{-} \to B$
$E^{\circ} = + 0.80 V$

Discussion

2442.	Which is the most electropositive substance among the following?
Answer» Which is the most electropositive substance among the following?

Discussion

2443.	Which among the following statements is incorrect for magnesium metal?(a) It burns in oxygen with a dazzling white flame.(b) It reacts with cold water to form magnesium oxide and evolves hydrogen gas.(c) It reacts with hot water to form magnesium hydroxide and evolves hydrogen gas.(d) It reacts with steam to form magnesium hydroxide and evolves hydrogen gas.
Answer» Which among the following statements is incorrect for magnesium metal? (a) It burns in oxygen with a dazzling white flame. (b) It reacts with cold water to form magnesium oxide and evolves hydrogen gas. (c) It reacts with hot water to form magnesium hydroxide and evolves hydrogen gas. (d) It reacts with steam to form magnesium hydroxide and evolves hydrogen gas.

Discussion

2444.	What is a functional group in a carbon compound? Identify the functional group present in CH3COOH and C2H5OH. [3 MARKS]
Answer» What is a functional group in a carbon compound? Identify the functional group present in ${CH}_{3} COOH$ and $C_{2} H_{5} OH$ . [3 MARKS]

Discussion

2445.	According to molecular orbital theory, the totalnumber of π bonds present in B2, C2,N2 and O2isIS(2) 4(4) 2(3) 5
Answer» According to molecular orbital theory, the totalnumber of π bonds present in B2, C2,N2 and O2isIS(2) 4(4) 2(3) 5

Discussion

2446.	The substance which can produce brisk effervescence with baking soda solution is : (a) ethanol (b) vegetable oil (c) vinegar (d) soap solution
Answer» The substance which can produce brisk effervescence with baking soda solution is : (a) ethanol (b) vegetable oil (c) vinegar (d) soap solution

2446.

The substance which can produce brisk effervescence with baking soda solution is : (a) ethanol (b) vegetable oil (c) vinegar (d) soap solution

Answer»

The substance which can produce brisk effervescence with baking soda solution is :

(a) ethanol (b) vegetable oil (c) vinegar (d) soap solution

Discussion

2447.	What percentage by mass of methane will be present in a mixture containing 50% helium and 50% methane by volume?
Answer» What percentage by mass of methane will be present in a mixture containing $50 %$ helium and $50 %$ methane by volume?

Discussion

2448.	Is there any non metal in solid state that does not exhibit any colour i.e. is black or white in colour?
Answer» Is there any non metal in solid state that does not exhibit any colour i.e. is black or white in colour?

Discussion

2449.	34 Which isotope of hydrogen has highest energy of e?
Answer» 34 Which isotope of hydrogen has highest energy of e?

Discussion

2450.	In an ore, the gangue particles are highly denser than ore particles. The process used for concentration of the ore is ___.
Answer» In an ore, the gangue particles are highly denser than ore particles. The process used for concentration of the ore is ___.

Discussion

Explore topic-wise InterviewSolutions in .

pH of 0.2 M sodium acetate solution is (pKa of CH3COOH is 4.74)?

Out of the following options, which gases change the colour of damp red litmus paper?

The potential energy of a spring is (1/2)Kx²(k=Force constant).How did the equation come?

Just give the order of acidity in HCOOH, CH3COOH, Phenol, Benzoic acid, water

Which of the following belong to same homologous series:C3H8, C3H6, C4H8, C4H6

A mixture of Mn+2 and Zn2+ can be separated by using an excess of

In the laboratory preparation of hydrochloric acid, the reactants used are:

If a carbon compound has 4 carbon atoms in its skeletal and the 2nd carbon atom has a doubly bonded oxygen attached to it, what is it called?

41. In a reaction 4A+2B+3C=A_4B_2C_3, what will be the no. Of moles of product formed when we stared with 1 mole A, 0.6 mole B and 0.72 mole C?

Match the following fractions with their equivalent fractional forms.

Where does all the energy in living organisms originate from?

Difference between polar and non polar compound

Explain what is formic acid.explain its structure ( most stable),write the formula of it and write discription on it/explain about it breafly.

Name the salt which is used as a preservative in pickles, and in curing meat and fish.

Question 38Explain some harmful effects of agricultural practices on the environment.

Name the property by which the following objects appear shiny.

17.BeC2 +H2O on heating . Is there is prodution of methane . Give me the reaction

MnO4−+8H++5e−→Mn2++4H2O Eo =1.51 VThe quantity of electricity required in Faraday to reduce five moles of MnO−4 is ____.

Why selectivity ratio is maximum for bromine that of chlorine

In which of the following molecule/ion all the bonds are not equal? (1) XeF4 (2) BF4-1 (3) C2H4 (4) SiF4

What is difference between ionization enthalpy and electron gain enthalpy and their trends in periodic table with justification?

Is their any trick for learning reactivity series of metal

Prove that - cos20 cos100 + cos100 cos140 - cos140 cos200 =-3/4

The metal that cannot liberate hydrogen with dilute acids is

Why does pH depend on temperature?

Why is in water 1 litre of water is equal to 1 kilogram of water?

If the set up has been immersed in water, what has changed?

Explain the formation of an ionic compound between metal and a non-metal by transfer of electrons with Mg as the metal and Cl as a non-metal to illustrate your answer.

Total number of geometrical isomers for the complex[RhCl(CO)(PPh3)(NH3)] is

Non-metallic character ___ from left to right in a period.

Arrange the following elements in the order of their abundance in Earth's crust.Aluminium - Al, Silicon - Si, Oxygen - O, Iron - Fe.

How can you prove that hydrochloric acid contains(i) hydrogen,(ii) chlorine?

The c-c and si-c interatomic distances are 154pm and 188pm. The atomic radius of Si is?

Why is titanium called a strategic metal? Mention two of its properties which make it so special.

The ability of metals by which they can be beaten into thin sheets is called _______.

Is the pH of baking soda solution is lesser than or greater than 7 ?Give reason

how can vaderwaal cons†an t (a) and (b) can be determined for He,H2,Co2,O2,Ch4,H2,

In the three different Lewis dot structures shown below, the dots around each atom represent

Two metals A and B have E∘=−0.76 and +0.80 V, respectively. Which will liberate H2 from H2SO4 ? Given, For A ; An++ne−→A E∘=−0.76 V For B ; Bn++ne−→B E∘=+0.80 V

Which is the most electropositive substance among the following?

What is a functional group in a carbon compound? Identify the functional group present in CH3COOH and C2H5OH. [3 MARKS]

According to molecular orbital theory, the totalnumber of π bonds present in B2, C2,N2 and O2isIS(2) 4(4) 2(3) 5

The substance which can produce brisk effervescence with baking soda solution is : (a) ethanol (b) vegetable oil (c) vinegar (d) soap solution

What percentage by mass of methane will be present in a mixture containing 50% helium and 50% methane by volume?

Is there any non metal in solid state that does not exhibit any colour i.e. is black or white in colour?

34 Which isotope of hydrogen has highest energy of e?

In an ore, the gangue particles are highly denser than ore particles. The process used for concentration of the ore is ___.