Advertisements
Advertisements
Question
Which of the following gases can be used for storage of fresh sample of an oil for a long time?
Options
Carbon dioxide or oxygen
Nitrogen or oxygen
Carbon dioxide or helium
Helium or nitrogen
Advertisements
Solution
Helium or nitrogen
Explanation -
Both helium (He) and nitrogen (N2) can be used. In their presence, rancidity of fresh sample of an oil will not take place.
APPEARS IN
RELATED QUESTIONS
Why it is necessary to balance a chemical equation ?
Write balanced chemical equations for the reactions represented by word equations in the conditions for a chemical reaction.
Balance the following equations Also name the products formed.
`K+CI_2→ KCI`
Balance the following equation. Also name the products formed.
`H_2 + CI_2 → HCI`
Write a balanced molecular equation for the following word equation:
\[\ce{Lead sulphate + ammonium hydroxide->Ammonium sulphate + lead hydroxide}\]
Balance the following equation:
\[\ce{Fe + H2O⇌Fe3O4 + H2}\]
Balance the following equation:
\[\ce{KHCO3->K2CO3 + H2O + CO2}\]
Underline the incorrectly balanced compound equation and rewrite the correct equation.
\[\ce{FeCl3 + 3NH4OH->2NH4Cl + Fe(OH)3}\]
Balance the following important equation:
ZnO + NaOH → Na2ZnO2 + H2O
Balance the following important equation:
NaAlO2 + H2O → NaOH + Al(OH)3
Balance the following important equation:
K2Cr2O7 + HCl → KCl + CrCl3 + H2O + Cl2
Balance the following important equation:
Ca(HCO3)2 + HNO3 → Ca(NO3)2 + H2O + CO2
When ferrous sulphate is heated strongly it undergoes decomposition to form ferric oxide as a main product accompanied by a change in colour from:
In the double displacement reaction between aqueous potassium iodide .and aqueous lead nitrate, a yellow precipitate of lead iodide is formed. While performing the activity if lead nitrate is not available, which of the following can be used in place of lead nitrate?
Write the balanced chemical equations for the following reactions and identify the type of reaction in each case.
- Iron (III) oxide reacts with aluminum and gives molten iron and aluminum oxide.
- Magnesium ribbon is burnt in an atmosphere of nitrogen gas to form solid magnesium nitride.
- Chlorine gas is passed in an aqueous potassium iodide solution to form potassium chloride solution and solid iodine.
- Ethanol is burnt in air to form carbon dioxide, water and releases heat.
Complete the missing component/variable given as x and y in the following reactions
`"CaCO"_2(s)overset(x)(->) "CaO"("s") + "CO"_2("g")`
Which among the following change is exothermic or endothermic in nature?
Dilution of sulphuric acid
Write the balanced chemical equation for the following reaction
Sodium carbonate on reaction with hydrochloric acid in equal molar concentrations gives sodium chloride and sodium hydrogencarbonate.
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.
Complete and balance the following equation:
\[\ce{NH4Cl + Ca(OH)2 ->}\]
