10223 + Interview Questions in Chemistry Page 174 InterviewSolution

8651.	For the redox reaction MnO−4+C2O−24+H+→Mn2++CO2+H2O the correct coefficients of the reactants for the balanced reaction are
Answer» For the redox reaction $M n O_{4}^{-} + C_{2} O_{4}^{- 2} + H^{+} \to M n^{2 +} + C O_{2} + H_{2} O$ the correct coefficients of the reactants for the balanced reaction are

Discussion

8652.	The substances which do not allow oxidation to occur are called _______ .
Answer» The substances which do not allow oxidation to occur are called _______ .

Discussion

8653.	Why do few lanthanons exhibit variable oxidation state?
Answer» Why do few lanthanons exhibit variable oxidation state?

Discussion

8654.	complete the table 12 C 6 81 br 35
Answer» complete the table 12 C 6 81 br 35

8654.

complete the table 12 C 6 81 br 35

Answer»

complete the table

12 C 6

81 br 35

Discussion

8655.	What is the effect of the following pollutants on living beings (one in each case). (a) Fluorides (b) Smoke particles (c) Lead (d) Mercury compounds (e) Smog (f) Nitrogen oxide
Answer» What is the effect of the following pollutants on living beings (one in each case). (a) Fluorides (b) Smoke particles (c) Lead (d) Mercury compounds (e) Smog (f) Nitrogen oxide

8655.

What is the effect of the following pollutants on living beings (one in each case). (a) Fluorides (b) Smoke particles (c) Lead (d) Mercury compounds (e) Smog (f) Nitrogen oxide

Answer»

What is the effect of the following pollutants on living beings (one in each case).

(a) Fluorides

(b) Smoke particles

(c) Lead

(d) Mercury compounds

(e) Smog

(f) Nitrogen oxide

Discussion

8656.	Calculate n-factor of Na3PO4 in the following reaction. Na3PO4 +3BaCl2 → 6NaCl + Ba3(PO4)2
Answer» Calculate n-factor of $N a_{3} P O_{4}$ in the following reaction. $N a_{3} P O_{4}$ + $3 B a C l_{2}$ $\to$ 6NaCl + $B a_{3} (P O_{4})_{2}$

8656.

Calculate n-factor of Na3PO4 in the following reaction. Na3PO4 +3BaCl2 → 6NaCl + Ba3(PO4)2

Answer»

Calculate n-factor of $N a_{3} P O_{4}$ in the following reaction.

$N a_{3} P O_{4}$ + $3 B a C l_{2}$ $\to$ 6NaCl + $B a_{3} (P O_{4})_{2}$

Discussion

8657.	How electrovalent bonds are formed?
Answer» How electrovalent bonds are formed?

Discussion

8658.	Explain in brief the experimental proof which led to the discovery of (1)electrons (2)protons(3) atomic nucleus (4) neutrons For 5 marks
Answer» Explain in brief the experimental proof which led to the discovery of (1)electrons (2)protons(3) atomic nucleus (4) neutrons For 5 marks

8658.

Explain in brief the experimental proof which led to the discovery of (1)electrons (2)protons(3) atomic nucleus (4) neutrons For 5 marks

Answer»

Explain in brief the experimental proof which led to the discovery of (1)electrons (2)protons(3) atomic nucleus (4) neutrons

For 5 marks

Discussion

8659.	Does gases have melting and boiling point?
Answer» Does gases have melting and boiling point?

Discussion

8660.	Why is graphite electrode used as anode in electrolyses of molten magnesium chloride
Answer» Why is graphite electrode used as anode in electrolyses of molten magnesium chloride

Discussion

8661.	Revese of the given chemical reaction is not possible.Justify the satement with reason. Zn (s) + CuSO4 (aq) -> ZnSO4 (aq) +Cu (s) (1 mark) answer in breif
Answer» Revese of the given chemical reaction is not possible.Justify the satement with reason. Zn _(s)+ CuSO_{4 (aq)}-> ZnSO_{4 (aq)}+Cu _(s) (1 mark) answer in breif

Discussion

8662.	Assuming 2s - 2p mixing is not operative the paramagnetic species among the following is:
Answer» Assuming 2s - 2p mixing is not operative the paramagnetic species among the following is:

Discussion

8663.	Which separation technique can be used to separate cream from milk?
Answer» Which separation technique can be used to separate cream from milk?

Discussion

8664.	A coating of _________ is usually deposited on iron to protect it from corrosion.
Answer» A coating of _________ is usually deposited on iron to protect it from corrosion.

Discussion

8665.	What is the chemical formula of sodium carbonate?
Answer» What is the chemical formula of sodium carbonate?

Discussion

8666.	Anode rays were discovered by
Answer» Anode rays were discovered by

Discussion

8667.	According to J.J Thomson, an atom is a positively charged sphere. Which sub atomic particles are embedded in it?
Answer» According to J.J Thomson, an atom is a positively charged sphere. Which sub atomic particles are embedded in it?

Discussion

8668.	Why does rain water have pH less than 7 ?
Answer» Why does rain water have pH less than 7 ?

8668.

Why does rain water have pH less than 7 ?

Answer»

Why does rain water have pH less than 7 ?

Discussion

8669.	Formula of a metallic oxide is MO. The formula of its phosphate will be
Answer» Formula of a metallic oxide is MO. The formula of its phosphate will be

8669.

Formula of a metallic oxide is MO. The formula of its phosphate will be

Answer»

Formula of a metallic oxide is MO. The formula of its phosphate will be

Discussion

8670.	Which of the following is true in case of an ice cream?
Answer» Which of the following is true in case of an ice cream?

Discussion

8671.	What do you mean by the atomic mass of an Element? [2 MARKS]
Answer» What do you mean by the atomic mass of an Element? [2 MARKS]

Discussion

8672.	Which of the following is incorrect?
Answer» Which of the following is incorrect?

Discussion

8673.	The highly ionized gas with equal number of positive and negative charges in which the particles exist in super excited states is called ____________ state.
Answer» The highly ionized gas with equal number of positive and negative charges in which the particles exist in super excited states is called ____________ state.

Discussion

8674.	Which of the following options is correctly matched?
Answer» Which of the following options is correctly matched?

Discussion

8675.	Which of the following element has the largest atomic radii?
Answer» Which of the following element has the largest atomic radii?

Discussion

8676.	How many moles in 9.033× 1023atoms of hydrogen.
Answer» How many moles in 9.033× $10^{23}$ atoms of hydrogen.

Discussion

8677.	Which among the given elements have similar chemical properties, as an atom of an element 'X' with an electronic configuration of 2, 8, 5?
Answer» Which among the given elements have similar chemical properties, as an atom of an element 'X' with an electronic configuration of 2, 8, 5?

Discussion

8678.	Assertion (A): Hydrogen resembles alkali metals. Reason (R): Hydrogen exists in atomic form at extreme temperatures (~5000K). Choose the most appropriate of the following:
Answer» Assertion (A): Hydrogen resembles alkali metals. Reason (R): Hydrogen exists in atomic form at extreme temperatures (~5000K). Choose the most appropriate of the following:

Discussion

8679.	Change the following celsius temperature to kelvin scale [2 MARKS] (i) – 273°C (ii) – 100°C (iii) – 40°C (iv) + 30°C
Answer» Change the following celsius temperature to kelvin scale [2 MARKS] (i) – 273°C (ii) – 100°C (iii) – 40°C (iv) + 30°C

Discussion

8680.	Which one of the following represents the electronic configuration of the most electropositive element
Answer» Which one of the following represents the electronic configuration of the most electropositive element

Discussion

8681.	Which of the ions has the largest ionic radius?
Answer» Which of the ions has the largest ionic radius?

Discussion

8682.	Which formula represents peroxide?
Answer» Which formula represents peroxide?

Discussion

8683.	Hydrogen by donating one electron forms H+. In this property, it resembles with
Answer» Hydrogen by donating one electron forms $H^{+}$ . In this property, it resembles with

Discussion

8684.	When potassium dichromate crystals are heated with conc. H2SO4, we get
Answer» When potassium dichromate crystals are heated with conc. $H_{2} S O_{4}$ , we get

Discussion

8685.	In burning of paper and the evaporation of water. Which of the following property does not change?
Answer» In burning of paper and the evaporation of water. Which of the following property does not change?

Discussion

8686.	A suspension is a ___ mixture in which very fine particles of solid are dispersed in any medium.
Answer» A suspension is a ___ mixture in which very fine particles of solid are dispersed in any medium.

Discussion

8687.	A balloon is filled with 15.5 g of water. What will be the number of water molecules contained in the balloon?
Answer» A balloon is filled with 15.5 g of water. What will be the number of water molecules contained in the balloon?

Discussion

8688.	When heat is constantly supplied by a burner to boiling water, then the temperature of water during vaporisation : (a) rises very slowly (b) rises rapidly until steam is produced (c) first rises and then becomes constant (d) does not rise at all
Answer» When heat is constantly supplied by a burner to boiling water, then the temperature of water during vaporisation : (a) rises very slowly (b) rises rapidly until steam is produced (c) first rises and then becomes constant (d) does not rise at all

8688.

When heat is constantly supplied by a burner to boiling water, then the temperature of water during vaporisation : (a) rises very slowly (b) rises rapidly until steam is produced (c) first rises and then becomes constant (d) does not rise at all

Answer»

When heat is constantly supplied by a burner to boiling water, then the temperature of water during vaporisation :

(a) rises very slowly (b) rises rapidly until steam is produced

(c) first rises and then becomes constant (d) does not rise at all

Discussion

8689.	How will you demonstrate that water vapour is present in air?
Answer» How will you demonstrate that water vapour is present in air?

Discussion

8690.	Why are Bohr orbits called stationary orbits?
Answer» Why are Bohr orbits called stationary orbits?

Discussion

8691.	Which of the following are true regarding oxidation states of transition elements?
Answer» Which of the following are true regarding oxidation states of transition elements?

Discussion

8692.	When cracks form at the base of a dam, the water seeping into the cracks exerts a buoyant force that tends to lift the dam. As a result, the dam can topple. Estimate the buoyant force exerted on a 2.0m thick by 4.0m wide dam wall by water seeping into cracks at its base. The water level in the lake is 5.0 m above the cracks.
Answer» When cracks form at the base of a dam, the water seeping into the cracks exerts a buoyant force that tends to lift the dam. As a result, the dam can topple. Estimate the buoyant force exerted on a 2.0m thick by 4.0m wide dam wall by water seeping into cracks at its base. The water level in the lake is 5.0 m above the cracks.

Discussion

8693.	Question 7(c) What is the mass of: (c) 10 moles of sodium sulphite (Na2SO3)?
Answer» Question 7(c) What is the mass of: (c) 10 moles of sodium sulphite $(N a_{2} S O_{3})$ ?

Discussion

8694.	The pair of compounds having metals in their highest oxidation state is
Answer» The pair of compounds having metals in their highest oxidation state is

Discussion

8695.	Find the chemical formula of aluminum chloride. [2 MARKS]
Answer» Find the chemical formula of aluminum chloride. [2 MARKS]

Discussion

8696.	CaO(s)+H2O(l)→Ca(OH)2(aq)+heat What can be inferred from the above reaction? (i) CaO is solid. (ii) CaO is reactive with water. (iii) H2O is liquid. (iv) H2O is in vapour state. (v) Ca(OH)2 forms a solution with water (vi) The reaction is exothermic.
Answer» $C a O (s) + H_{2} O (l) \to C a (O H)_{2} (a q) + h e a t$ What can be inferred from the above reaction? (i) $C a O$ is solid. (ii) $C a O$ is reactive with water. (iii) $H_{2} O$ is liquid. (iv) $H_{2} O$ is in vapour state. (v) $C a (O H)_{2}$ forms a solution with water (vi) The reaction is exothermic.

8696.

CaO(s)+H2O(l)→Ca(OH)2(aq)+heat What can be inferred from the above reaction? (i) CaO is solid. (ii) CaO is reactive with water. (iii) H2O is liquid. (iv) H2O is in vapour state. (v) Ca(OH)2 forms a solution with water (vi) The reaction is exothermic.

Answer»

$C a O (s) + H_{2} O (l) \to C a (O H)_{2} (a q) + h e a t$

What can be inferred from the above reaction?

(i) $C a O$ is solid.

(ii) $C a O$ is reactive with water.

(iii) $H_{2} O$ is liquid.

(iv) $H_{2} O$ is in vapour state.

(v) $C a (O H)_{2}$ forms a solution with water

(vi) The reaction is exothermic.

Discussion

8697.	Explain how does solubility of a substance vary in temperature.
Answer» Explain how does solubility of a substance vary in temperature.

Discussion

8698.	Question 1(h) Evaluate the following [(- 36) ÷ 12] ÷ 3
Answer» Question 1(h) Evaluate the following [(- 36) $\div$ 12] $\div$ 3

Discussion

8699.	Calculate the formality of NaCl solution having 1.78 gm solute dissolved in 178 ml solution.
Answer» Calculate the formality of NaCl solution having 1.78 gm solute dissolved in 178 ml solution.

Discussion

8700.	Question 33 Write a balanced chemical equation for each of the following reactions and also classify them. (a) Lead acetate solution is treated with dilute hydrochloric acid to form lead chloride and acetic acid solution. (b) A piece of sodium metal is added to absolute ethanol to form sodium ethoxide and hydrogen gas. (c) Iron (III) oxide on heating with carbon monoxide gas reacts to form solid iron and liberates carbon dioxide gas. (d) Hydrogen sulphide gas reacts with oxygen gas to form solid sulphur and liquid water.
Answer» Question 33 Write a balanced chemical equation for each of the following reactions and also classify them. (a) Lead acetate solution is treated with dilute hydrochloric acid to form lead chloride and acetic acid solution. (b) A piece of sodium metal is added to absolute ethanol to form sodium ethoxide and hydrogen gas. (c) Iron (III) oxide on heating with carbon monoxide gas reacts to form solid iron and liberates carbon dioxide gas. (d) Hydrogen sulphide gas reacts with oxygen gas to form solid sulphur and liquid water.

8700.

Question 33 Write a balanced chemical equation for each of the following reactions and also classify them. (a) Lead acetate solution is treated with dilute hydrochloric acid to form lead chloride and acetic acid solution. (b) A piece of sodium metal is added to absolute ethanol to form sodium ethoxide and hydrogen gas. (c) Iron (III) oxide on heating with carbon monoxide gas reacts to form solid iron and liberates carbon dioxide gas. (d) Hydrogen sulphide gas reacts with oxygen gas to form solid sulphur and liquid water.

Answer»

Question 33
Write a balanced chemical equation for each of the following reactions and also classify them.

(a) Lead acetate solution is treated with dilute hydrochloric acid to form lead chloride and acetic acid solution.

(b) A piece of sodium metal is added to absolute ethanol to form sodium ethoxide and hydrogen gas.

(c) Iron (III) oxide on heating with carbon monoxide gas reacts to form solid iron and liberates carbon dioxide gas.

(d) Hydrogen sulphide gas reacts with oxygen gas to form solid sulphur and liquid water.

Discussion

Explore topic-wise InterviewSolutions in .

For the redox reaction MnO−4+C2O−24+H+→Mn2++CO2+H2O the correct coefficients of the reactants for the balanced reaction are

The substances which do not allow oxidation to occur are called _______ .

Why do few lanthanons exhibit variable oxidation state?

complete the table 12 C 6 81 br 35

What is the effect of the following pollutants on living beings (one in each case). (a) Fluorides (b) Smoke particles (c) Lead (d) Mercury compounds (e) Smog (f) Nitrogen oxide

Calculate n-factor of Na3PO4 in the following reaction. Na3PO4 +3BaCl2 → 6NaCl + Ba3(PO4)2

How electrovalent bonds are formed?

Explain in brief the experimental proof which led to the discovery of (1)electrons (2)protons(3) atomic nucleus (4) neutrons For 5 marks

Does gases have melting and boiling point?

Why is graphite electrode used as anode in electrolyses of molten magnesium chloride

Revese of the given chemical reaction is not possible.Justify the satement with reason. Zn (s) + CuSO4 (aq) -> ZnSO4 (aq) +Cu (s) (1 mark) answer in breif

Assuming 2s - 2p mixing is not operative the paramagnetic species among the following is:

Which separation technique can be used to separate cream from milk?

A coating of _________ is usually deposited on iron to protect it from corrosion.

What is the chemical formula of sodium carbonate?

Anode rays were discovered by

According to J.J Thomson, an atom is a positively charged sphere. Which sub atomic particles are embedded in it?

Why does rain water have pH less than 7 ?

Formula of a metallic oxide is MO. The formula of its phosphate will be

Which of the following is true in case of an ice cream?

What do you mean by the atomic mass of an Element? [2 MARKS]

Which of the following is incorrect?

The highly ionized gas with equal number of positive and negative charges in which the particles exist in super excited states is called ____________ state.

Which of the following options is correctly matched?

Which of the following element has the largest atomic radii?

How many moles in 9.033× 1023atoms of hydrogen.

Which among the given elements have similar chemical properties, as an atom of an element 'X' with an electronic configuration of 2, 8, 5?

Assertion (A): Hydrogen resembles alkali metals. Reason (R): Hydrogen exists in atomic form at extreme temperatures (~5000K). Choose the most appropriate of the following:

Change the following celsius temperature to kelvin scale [2 MARKS] (i) – 273°C (ii) – 100°C (iii) – 40°C (iv) + 30°C

Which one of the following represents the electronic configuration of the most electropositive element

Which of the ions has the largest ionic radius?

Which formula represents peroxide?

Hydrogen by donating one electron forms H+. In this property, it resembles with

When potassium dichromate crystals are heated with conc. H2SO4, we get

In burning of paper and the evaporation of water. Which of the following property does not change?

A suspension is a ___ mixture in which very fine particles of solid are dispersed in any medium.

A balloon is filled with 15.5 g of water. What will be the number of water molecules contained in the balloon?

When heat is constantly supplied by a burner to boiling water, then the temperature of water during vaporisation : (a) rises very slowly (b) rises rapidly until steam is produced (c) first rises and then becomes constant (d) does not rise at all

How will you demonstrate that water vapour is present in air?

Why are Bohr orbits called stationary orbits?

Which of the following are true regarding oxidation states of transition elements?

Question 7(c) What is the mass of: (c) 10 moles of sodium sulphite (Na2SO3)?

The pair of compounds having metals in their highest oxidation state is

Find the chemical formula of aluminum chloride. [2 MARKS]

CaO(s)+H2O(l)→Ca(OH)2(aq)+heat What can be inferred from the above reaction? (i) CaO is solid. (ii) CaO is reactive with water. (iii) H2O is liquid. (iv) H2O is in vapour state. (v) Ca(OH)2 forms a solution with water (vi) The reaction is exothermic.

Explain how does solubility of a substance vary in temperature.

Question 1(h) Evaluate the following [(- 36) ÷ 12] ÷ 3

Calculate the formality of NaCl solution having 1.78 gm solute dissolved in 178 ml solution.