Question
Explain the following :
Water is a polar covalent molecule ?
Water is a polar covalent molecule ?
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Answer
This means that in the water molecule, one side is positively charged and the other side is negatively charged.
Explanation:
Explanation:
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Copy and complete the following table which relates to three homologous series of hydrocarbons:
| General Formula | CnH2n | CnH2n-2 | CnH2n+2 |
| IUPAC name of the homologous series | |||
| Characteristic bond type | Single bonds | ||
| IUPAC name of the first member of the series | |||
| Type of reaction with chlorine | Addition |
A metal whose alloy finds use in the construction of aircrafts in the powdered form is added to sodium hydroxide solution. A colourless gas was evolved and after reaction was over, the solution was colourless.
(a) Name the powdered metal added to sodium hydroxide solution.
(b) Name the gas evolved.
(c) Name the salt present in the colorless solution.
(a) Name the powdered metal added to sodium hydroxide solution.
(b) Name the gas evolved.
(c) Name the salt present in the colorless solution.
$
MnO _2+4 HCl \rightarrow MnCl _2+2 H _2 O + Cl _2
$
0.02 moles of pure $MnO _2$ is heated strongly with conc. $HCl$. Calculate: Mass of acid required
→MnO _2+4 HCl \rightarrow MnCl _2+2 H _2 O + Cl _2
$
0.02 moles of pure $MnO _2$ is heated strongly with conc. $HCl$. Calculate: Mass of acid required
An organic compound with vapour density = 94 contains C = 12.67%, H = 2.13%, and Br = 85.11%. Find the molecular formula.
(Atomic mass : C = 12, H = 1, Br = 80}
(Atomic mass : C = 12, H = 1, Br = 80}
Give reason for the following:
The ratio of hydrogen and oxygen formed at the cathode and anode is 2: 1 by volume.
The ratio of hydrogen and oxygen formed at the cathode and anode is 2: 1 by volume.
(a) Calculate the mass of ammonia that can be obtained from $21.4 g$ of $NH _4 Cl$ by the reaction:
$2 NH _4 Cl + Ca ( OH )_2 \rightarrow CaCl _2+2 H _2 O +2 NH _3$
(b) What will be the volume of ammonia when measured at S.T.P?
The molar volume of a gas $=22.4$ litres at STP.
→$2 NH _4 Cl + Ca ( OH )_2 \rightarrow CaCl _2+2 H _2 O +2 NH _3$
(b) What will be the volume of ammonia when measured at S.T.P?
The molar volume of a gas $=22.4$ litres at STP.
You are provided with the list of chemicals below in the box:
Using suitable chemicals from the list given below, write balanced chemical equations for the preparation of the salts mentioned below:
(i) Lead carbonate
(ii) Ammonium sulphate
Using suitable chemicals from the list given below, write balanced chemical equations for the preparation of the salts mentioned below:
(i) Lead carbonate
(ii) Ammonium sulphate
How would you prepare :
Calcium sulphate from calcium carbonate
Calcium sulphate from calcium carbonate
Solve the following :
The vapour density of a gas is 8. What would be the volume occupied by 24.0 of the gas at STP?
The vapour density of a gas is 8. What would be the volume occupied by 24.0 of the gas at STP?
Write chemical equations for obtaining the following from dil. sulphuric acid.
(i) Hydrogen (ii) Carbon dioxide (iii) Sulphur dioxide
(i) Hydrogen (ii) Carbon dioxide (iii) Sulphur dioxide