7248 + Interview Questions in Chemistry Page 51 InterviewSolution

2501.	name the compounds which are used to check reactivity of various metals
Answer» name the compounds which are used to check reactivity of various metals

Discussion

2502.	Question 31During the reaction of some metals with dilute hydrochloric acid, following observations were made.(a) Silver metal does not show any change.(b) The temperature of the reaction mixture rises when aluminium (Al) is added.(c) The reaction of sodium metal is found to be highly explosive.(d) Some bubbles of a gas are seen when lead (Pb) is reacted with the acid.Explain these observations giving suitable reasons.
Answer» Question 31 During the reaction of some metals with dilute hydrochloric acid, following observations were made. (a) Silver metal does not show any change. (b) The temperature of the reaction mixture rises when aluminium (Al) is added. (c) The reaction of sodium metal is found to be highly explosive. (d) Some bubbles of a gas are seen when lead (Pb) is reacted with the acid. Explain these observations giving suitable reasons.

2502.

Question 31During the reaction of some metals with dilute hydrochloric acid, following observations were made.(a) Silver metal does not show any change.(b) The temperature of the reaction mixture rises when aluminium (Al) is added.(c) The reaction of sodium metal is found to be highly explosive.(d) Some bubbles of a gas are seen when lead (Pb) is reacted with the acid.Explain these observations giving suitable reasons.

Answer»

Question 31

During the reaction of some metals with dilute hydrochloric acid, following observations were made.

(a) Silver metal does not show any change.

(b) The temperature of the reaction mixture rises when aluminium (Al) is added.

(c) The reaction of sodium metal is found to be highly explosive.

(d) Some bubbles of a gas are seen when lead (Pb) is reacted with the acid.

Explain these observations giving suitable reasons.

Discussion

2503.	The metals are obtained from their oxides form by:
Answer» The metals are obtained from their oxides form by:

Discussion

2504.	formula for ferrocene is
Answer» formula for ferrocene is

Discussion

2505.	Which plastic is used in firemen's uniform and why? [2 MARKS]
Answer» Which plastic is used in firemen's uniform and why? [2 MARKS]

Discussion

2506.	What happens when water is added to kerosene?
Answer» What happens when water is added to kerosene?

Discussion

2507.	Which of the following is an example of inexhaustible natural resources?
Answer» Which of the following is an example of inexhaustible natural resources?

Discussion

2508.	Question 17Combustion of fossil fuels generates a lot of air pollution. Can you suggest any two alternative sources of energy which do not cause any pollution?
Answer» Question 17 Combustion of fossil fuels generates a lot of air pollution. Can you suggest any two alternative sources of energy which do not cause any pollution?

Discussion

2509.	Question 1Explain why some fibres are called synthetic.
Answer» Question 1 Explain why some fibres are called synthetic.

Discussion

2510.	___ acts as a lubricant at higher temperatures.
Answer» ___ acts as a lubricant at higher temperatures.

Discussion

2511.	Out of the following distillates of coal, which one readily undergo combustion?
Answer» Out of the following distillates of coal, which one readily undergo combustion?

Discussion

2512.	Why gravitational force is termed as a weak force?
Answer» Why gravitational force is termed as a weak force?

Discussion

2513.	Which one of the following is not a colloidal solution?
Answer» Which one of the following is not a colloidal solution?

Discussion

2514.	How to remove hardness of water?
Answer» How to remove hardness of water?

Discussion

2515.	Vapour pressure of pure water is 40 mmHg. If a non volatile, non electrolyte solute is added to it vapour pressure is reduced by 4 mmHg. Find the molality of the solution.
Answer» Vapour pressure of pure water is 40 mmHg. If a non volatile, non electrolyte solute is added to it vapour pressure is reduced by 4 mmHg. Find the molality of the solution.

Discussion

2516.	What is the use of atmospheric ozone?
Answer» What is the use of atmospheric ozone?

Discussion

2517.	75. Is velocity of a electron in a Bohr model depends on its mass. ? Why?
Answer» 75. Is velocity of a electron in a Bohr model depends on its mass. ? Why?

Discussion

2518.	17.Water is supercooled to -4^° C. The enthalpy (H) is (a) same as that of ice at -4^° C (b) more than that of ice at -4^° C (c) same as that of ice at 0^° C (d) less than that of ice at -4^° C
Answer» 17.Water is supercooled to -4^° C. The enthalpy (H) is (a) same as that of ice at -4^° C (b) more than that of ice at -4^° C (c) same as that of ice at 0^° C (d) less than that of ice at -4^° C

Discussion

2519.	Explain chemical reaction of metals.
Answer» Explain chemical reaction of metals.

Discussion

2520.	What volume of gas (O2) measured at 0^°C and 1 atm, is needed to burn completely 1 L of propane gas C3H8 measured under the same conditions?
Answer» What volume of gas (O2) measured at 0^°C and 1 atm, is needed to burn completely 1 L of propane gas C3H8 measured under the same conditions?

Discussion

2521.	Write the structures of the monomers used for getting the following polymers:(a) Nylon-6,6(b) Melamine - formaldehyde polymer(c) Buna - S
Answer» Write the structures of the monomers used for getting the following polymers: (a) Nylon-6,6 (b) Melamine - formaldehyde polymer (c) Buna - S

Discussion

2522.	Explain the process of formation of petroleum? Name any three constituents of petroleum?
Answer» Explain the process of formation of petroleum? Name any three constituents of petroleum?

Discussion

2523.	The calorific value of a fuel is 40000 kJ/kg. This fuel is most likely to be : (a) biogas (b) methane (c) hydrogen gas (d) liquefied petroleum gas
Answer» The calorific value of a fuel is 40000 kJ/kg. This fuel is most likely to be : (a) biogas (b) methane (c) hydrogen gas (d) liquefied petroleum gas

2523.

The calorific value of a fuel is 40000 kJ/kg. This fuel is most likely to be : (a) biogas (b) methane (c) hydrogen gas (d) liquefied petroleum gas

Answer»

The calorific value of a fuel is 40000 kJ/kg. This fuel is most likely to be :

(a) biogas

(b) methane

(c) hydrogen gas

(d) liquefied petroleum gas

Discussion

2524.	Show the process of chlorination, nitration and sulphonation of haloarenes with mechanisms
Answer» Show the process of chlorination, nitration and sulphonation of haloarenes with mechanisms

Discussion

2525.	Question 2A cell will swell up if:(a) The concentration of water molecules in the cell is higher than the concentration of water molecules in surrounding medium(b) The concentration of water molecules in surrounding medium is higher than water molecules concentration in the cell(c) The concentration of water molecules is same in the cell and in the surrounding medium(d) Concentration of water molecules does not matter
Answer» Question 2 A cell will swell up if: (a) The concentration of water molecules in the cell is higher than the concentration of water molecules in surrounding medium (b) The concentration of water molecules in surrounding medium is higher than water molecules concentration in the cell (c) The concentration of water molecules is same in the cell and in the surrounding medium (d) Concentration of water molecules does not matter

Discussion

2526.	Rayon is different from truly synthetic fibre because
Answer» Rayon is different from truly synthetic fibre because

Discussion

2527.	Upward acceleration of a rocket is given by (where v = speed of gas relative to rocket, M = mass of rocket and m = mass of fuel) with respect to gravity, the acceleration of rocket is given by
Answer» Upward acceleration of a rocket is given by (where v = speed of gas relative to rocket, M = mass of rocket and m = mass of fuel) with respect to gravity, the acceleration of rocket is given by

Discussion

2528.	In a solution 0.1 M H3PO4 acid, concentration of H+ is :[Use : Ka1=10−3,Ka2=10−7,Ka3=10−12]
Answer» In a solution 0.1 M H3PO4 acid, concentration of H+ is : [Use : Ka1=10−3,Ka2=10−7,Ka3=10−12]

Discussion

2529.	‘Manufacturing synthetic fibres is actually a helping conservation of forests’. Comment.
Answer» ‘Manufacturing synthetic fibres is actually a helping conservation of forests’. Comment.

Discussion

2530.	Give the uses for the following plastics: 1. Nylon 2. LDPE 3. HDPE 4. PS 5. PP [5 MARKS]
Answer» Give the uses for the following plastics: 1. Nylon 2. LDPE 3. HDPE 4. PS 5. PP [5 MARKS]

Discussion

2531.	Find volume of nitrogen gas adsorbed per gm of solid at 1 atm if 4gm of N2 is adsorbed on2 gm solid at 300K
Answer» Find volume of nitrogen gas adsorbed per gm of solid at 1 atm if 4gm of N2 is adsorbed on2 gm solid at 300K

Discussion

2532.	Question 13Abida and Ramesh were doing an experiment in which water was to be heated in a beaker. Abidakept the beaker near the wick in the yellow part of the candle flame. Ramesh kept the beaker in the outermost part of the flame. Whose waterwill get heated in a shorter time?
Answer» Question 13 Abida and Ramesh were doing an experiment in which water was to be heated in a beaker. Abidakept the beaker near the wick in the yellow part of the candle flame. Ramesh kept the beaker in the outermost part of the flame. Whose waterwill get heated in a shorter time?

Discussion

2533.	Which glass is known as water glass and why?
Answer» Which glass is known as water glass and why?

Discussion

2534.	16. In the structure of the rock salt if all the ions present at body diagonal plane are removed then what is the new formula of the rock salt ?
Answer» 16. In the structure of the rock salt if all the ions present at body diagonal plane are removed then what is the new formula of the rock salt ?

Discussion

2535.	Which of the following has a high ignition temperature?
Answer» Which of the following has a high ignition temperature?

Discussion

2536.	The standard reduction potential of a silver chloride electrode is 0.2 V and that of a silver electrode is 0.79 V. The maximum amount of AgCl that can be dissolved in 106 L of a 0.1 M AgNO3 solution is:
Answer» The standard reduction potential of a silver chloride electrode is $0.2 V$ and that of a silver electrode is $0.79 V$ . The maximum amount of $A g C l$ that can be dissolved in $10^{6} L$ of a $0.1 M A g N O_{3}$ solution is:

Discussion

2537.	Question 16Give reasons why copper is used to make hot water tanks and not steel (an alloy of iron).
Answer» Question 16 Give reasons why copper is used to make hot water tanks and not steel (an alloy of iron).

Discussion

2538.	How is rayon made
Answer» How is rayon made

Discussion

2539.	The balanced chemical equation for potassium reacting with water is:
Answer» The balanced chemical equation for potassium reacting with water is:

Discussion

2540.	Decomposition reaction gives us __________ compounds.
Answer» Decomposition reaction gives us __________ compounds.

Discussion

2541.	Which of the following non-metal is found in a liquid state?
Answer» Which of the following non-metal is found in a liquid state?

Discussion

2542.	11 grams of a gas occupy 5.6 litres of volume at STP. THE gas is A)NO B)N2O4 C)CO D)CO2
Answer» 11 grams of a gas occupy 5.6 litres of volume at STP. THE gas is A)NO B)N2O4 C)CO D)CO2

Discussion

2543.	What makes a diamond shine?
Answer» What makes a diamond shine?

Discussion

2544.	When we add water to milk, they get mixed properly because
Answer» When we add water to milk, they get mixed properly because

Discussion

2545.	Question 32A substance X, which is an oxide of a group 2 element, is used intensively in the cement industry. This element is present in bones also. On treatment with water, it forms a solution which turns red litmus blue. Identify X and also write the chemical reactions involved.
Answer» Question 32 A substance X, which is an oxide of a group 2 element, is used intensively in the cement industry. This element is present in bones also. On treatment with water, it forms a solution which turns red litmus blue. Identify X and also write the chemical reactions involved.

Discussion

2546.	Which of the following elements is a metalloid ? (a) sodium (b) sulphur (c) silicon (d) silver
Answer» Which of the following elements is a metalloid ? (a) sodium (b) sulphur (c) silicon (d) silver

2546.

Which of the following elements is a metalloid ? (a) sodium (b) sulphur (c) silicon (d) silver

Answer»

Which of the following elements is a metalloid ?

(a) sodium

(b) sulphur

(c) silicon

(d) silver

Discussion

2547.	naturally only 1 of either +(d) or -(l) form is present for a compound?while both D and L forms can be present in nature for a compound?
Answer» naturally only 1 of either +(d) or -(l) form is present for a compound? while both D and L forms can be present in nature for a compound?

Discussion

2548.	Name a metal that can be cut by a knife ?
Answer» Name a metal that can be cut by a knife ?

Discussion

2549.	88. He particle has mass of 4.00300amu.A proton has mass 1.00783amu&a neutron has mass of 1.00867amu. The BE of He estimated from these data is the closest to Options 1).27.9MeV 2).22.3MeV 3).35 MeV 4).20.4MeV
Answer» 88. He particle has mass of 4.00300amu.A proton has mass 1.00783amu&a neutron has mass of 1.00867amu. The BE of He estimated from these data is the closest to Options 1).27.9MeV 2).22.3MeV 3).35 MeV 4).20.4MeV

Discussion

2550.	Write the steps to separate a mixture containing stones, sand, and ammonium chloride.
Answer» Write the steps to separate a mixture containing stones, sand, and ammonium chloride.

Discussion

Explore topic-wise InterviewSolutions in .

name the compounds which are used to check reactivity of various metals

The metals are obtained from their oxides form by:

formula for ferrocene is

Which plastic is used in firemen's uniform and why? [2 MARKS]

What happens when water is added to kerosene?

Which of the following is an example of inexhaustible natural resources?

Question 17Combustion of fossil fuels generates a lot of air pollution. Can you suggest any two alternative sources of energy which do not cause any pollution?

Question 1Explain why some fibres are called synthetic.

___ acts as a lubricant at higher temperatures.

Out of the following distillates of coal, which one readily undergo combustion?

Why gravitational force is termed as a weak force?

Which one of the following is not a colloidal solution?

How to remove hardness of water?

Vapour pressure of pure water is 40 mmHg. If a non volatile, non electrolyte solute is added to it vapour pressure is reduced by 4 mmHg. Find the molality of the solution.

What is the use of atmospheric ozone?

75. Is velocity of a electron in a Bohr model depends on its mass. ? Why?

17.Water is supercooled to -4^° C. The enthalpy (H) is (a) same as that of ice at -4^° C (b) more than that of ice at -4^° C (c) same as that of ice at 0^° C (d) less than that of ice at -4^° C

Explain chemical reaction of metals.

What volume of gas (O2) measured at 0^°C and 1 atm, is needed to burn completely 1 L of propane gas C3H8 measured under the same conditions?

Write the structures of the monomers used for getting the following polymers:(a) Nylon-6,6(b) Melamine - formaldehyde polymer(c) Buna - S

Explain the process of formation of petroleum? Name any three constituents of petroleum?

The calorific value of a fuel is 40000 kJ/kg. This fuel is most likely to be : (a) biogas (b) methane (c) hydrogen gas (d) liquefied petroleum gas

Show the process of chlorination, nitration and sulphonation of haloarenes with mechanisms

Rayon is different from truly synthetic fibre because

Upward acceleration of a rocket is given by (where v = speed of gas relative to rocket, M = mass of rocket and m = mass of fuel) with respect to gravity, the acceleration of rocket is given by

In a solution 0.1 M H3​PO4​ acid, concentration of H+ is :[Use : Ka1​​=10−3,Ka2​​=10−7,Ka3​​=10−12]

‘Manufacturing synthetic fibres is actually a helping conservation of forests’. Comment.​

Give the uses for the following plastics: 1. Nylon 2. LDPE 3. HDPE 4. PS 5. PP [5 MARKS]

Find volume of nitrogen gas adsorbed per gm of solid at 1 atm if 4gm of N2 is adsorbed on2 gm solid at 300K

Question 13Abida and Ramesh were doing an experiment in which water was to be heated in a beaker. Abidakept the beaker near the wick in the yellow part of the candle flame. Ramesh kept the beaker in the outermost part of the flame. Whose waterwill get heated in a shorter time?

Which glass is known as water glass and why?

16. In the structure of the rock salt if all the ions present at body diagonal plane are removed then what is the new formula of the rock salt ?

Which of the following has a high ignition temperature?

The standard reduction potential of a silver chloride electrode is 0.2 V and that of a silver electrode is 0.79 V. The maximum amount of AgCl that can be dissolved in 106 L of a 0.1 M AgNO3 solution is:

Question 16Give reasons why copper is used to make hot water tanks and not steel (an alloy of iron).

How is rayon made

The balanced chemical equation for potassium reacting with water is:

Decomposition reaction gives us __________ compounds.

Which of the following non-metal is found in a liquid state?

11 grams of a gas occupy 5.6 litres of volume at STP. THE gas is A)NO B)N2O4 C)CO D)CO2

What makes a diamond shine?

When we add water to milk, they get mixed properly because

Question 32A substance X, which is an oxide of a group 2 element, is used intensively in the cement industry. This element is present in bones also. On treatment with water, it forms a solution which turns red litmus blue. Identify X and also write the chemical reactions involved.

Which of the following elements is a metalloid ? (a) sodium (b) sulphur (c) silicon (d) silver

naturally only 1 of either +(d) or -(l) form is present for a compound?while both D and L forms can be present in nature for a compound?

Name a metal that can be cut by a knife ?

88. He particle has mass of 4.00300amu.A proton has mass 1.00783amu&a neutron has mass of 1.00867amu. The BE of He estimated from these data is the closest to Options 1).27.9MeV 2).22.3MeV 3).35 MeV 4).20.4MeV

Write the steps to separate a mixture containing stones, sand, and ammonium chloride.

In a solution 0.1 M H3PO4 acid, concentration of H+ is :[Use : Ka1=10−3,Ka2=10−7,Ka3=10−12]

‘Manufacturing synthetic fibres is actually a helping conservation of forests’. Comment.