228198
The SI unit of electrochemical equivalent is
1 $\mathrm{J} \mathrm{s}^{-1}$
2 $\mathrm{kg} \mathrm{C}^{-1}$
3 $\mathrm{kg} \mathrm{m} \mathrm{s}^{-2}$
4 $\mathrm{kg} \mathrm{m}^{-1} \mathrm{~s}^{-2}$
Explanation:
Electrochemical equivalent is the mass of the substance deposited to one of the electrodes when a current of 1 ampere is passed for 1 second. The SI unit of electrochemical equivalent weight is $\mathrm{kg}$ $\mathrm{C}^{-1}$
MHT CET-03.05.2019
Some Basic Concepts of Chemistry
228193
The prefix $10^{18}$ is
1 giga
2 kilo
3 Exa
4 nano
Explanation:
Exa is a decimal unit prefix in the matric system. Exa $=10^{18}$, Giga $=10^9$ Kilo $=10^3$, Nano $=10^{-9}$
BITSAT 2015
Some Basic Concepts of Chemistry
228196
The value of which of the following unit of concentration will not change with the change in temperature?
1 Molarity
2 Molality
3 Normality
4 Formality
Explanation:
Molality $=\frac{\text { Moles of solute }}{\text { Mass of solvent in } \mathrm{kg}}$ Molality of concentration will not change with the change in temperature because in molality both moles of solute and mass of solvent are independent of temperature. Thus, molality is independent of temperature. Molarity (M) is the amount of a substance in a certain volume of solution. Molarity is defined as the moles of a solute per litres of a solution. Normality is a measure of concentration equal to the gram equivalent weight per litre of solution. Formality is a substance's total concentration in solution without regard to its specific chemical form.
GUJCET-2019
Some Basic Concepts of Chemistry
228201
Which symbol replaces the unit of atomic mass, amu?
1 $\mathrm{u}$
2 $\mathrm{A}$
3 $\mathrm{M}$
4 $\mathrm{n}$
Explanation:
u symbol represent the unit of atomic mass, amu. Where, $\mathrm{a}=$ Atomic mass number $\mathrm{m}=$ Molecular mass of the molecule. $\mathrm{n}=$ Number of atoms
MHT CET-2018
Some Basic Concepts of Chemistry
228202
Which one of the following statements is not correct?
1 The hydration enthalpies of alkali metal ions decrease down the group
2 Lithium halides are some what covalent in nature
3 Alkali metals react with water liberating oxygen gas
4 $\mathrm{KO}_2$ is paramagnetic
Explanation:
Alkali metal reacts with water to give metal hydroxide and hydrogen. $2 \mathrm{M}+2 \mathrm{H}_2 \mathrm{O} \longrightarrow 2 \mathrm{MOH}+\mathrm{H}_2(\mathrm{~g}) \text {. }$ alkali metal
228198
The SI unit of electrochemical equivalent is
1 $\mathrm{J} \mathrm{s}^{-1}$
2 $\mathrm{kg} \mathrm{C}^{-1}$
3 $\mathrm{kg} \mathrm{m} \mathrm{s}^{-2}$
4 $\mathrm{kg} \mathrm{m}^{-1} \mathrm{~s}^{-2}$
Explanation:
Electrochemical equivalent is the mass of the substance deposited to one of the electrodes when a current of 1 ampere is passed for 1 second. The SI unit of electrochemical equivalent weight is $\mathrm{kg}$ $\mathrm{C}^{-1}$
MHT CET-03.05.2019
Some Basic Concepts of Chemistry
228193
The prefix $10^{18}$ is
1 giga
2 kilo
3 Exa
4 nano
Explanation:
Exa is a decimal unit prefix in the matric system. Exa $=10^{18}$, Giga $=10^9$ Kilo $=10^3$, Nano $=10^{-9}$
BITSAT 2015
Some Basic Concepts of Chemistry
228196
The value of which of the following unit of concentration will not change with the change in temperature?
1 Molarity
2 Molality
3 Normality
4 Formality
Explanation:
Molality $=\frac{\text { Moles of solute }}{\text { Mass of solvent in } \mathrm{kg}}$ Molality of concentration will not change with the change in temperature because in molality both moles of solute and mass of solvent are independent of temperature. Thus, molality is independent of temperature. Molarity (M) is the amount of a substance in a certain volume of solution. Molarity is defined as the moles of a solute per litres of a solution. Normality is a measure of concentration equal to the gram equivalent weight per litre of solution. Formality is a substance's total concentration in solution without regard to its specific chemical form.
GUJCET-2019
Some Basic Concepts of Chemistry
228201
Which symbol replaces the unit of atomic mass, amu?
1 $\mathrm{u}$
2 $\mathrm{A}$
3 $\mathrm{M}$
4 $\mathrm{n}$
Explanation:
u symbol represent the unit of atomic mass, amu. Where, $\mathrm{a}=$ Atomic mass number $\mathrm{m}=$ Molecular mass of the molecule. $\mathrm{n}=$ Number of atoms
MHT CET-2018
Some Basic Concepts of Chemistry
228202
Which one of the following statements is not correct?
1 The hydration enthalpies of alkali metal ions decrease down the group
2 Lithium halides are some what covalent in nature
3 Alkali metals react with water liberating oxygen gas
4 $\mathrm{KO}_2$ is paramagnetic
Explanation:
Alkali metal reacts with water to give metal hydroxide and hydrogen. $2 \mathrm{M}+2 \mathrm{H}_2 \mathrm{O} \longrightarrow 2 \mathrm{MOH}+\mathrm{H}_2(\mathrm{~g}) \text {. }$ alkali metal
228198
The SI unit of electrochemical equivalent is
1 $\mathrm{J} \mathrm{s}^{-1}$
2 $\mathrm{kg} \mathrm{C}^{-1}$
3 $\mathrm{kg} \mathrm{m} \mathrm{s}^{-2}$
4 $\mathrm{kg} \mathrm{m}^{-1} \mathrm{~s}^{-2}$
Explanation:
Electrochemical equivalent is the mass of the substance deposited to one of the electrodes when a current of 1 ampere is passed for 1 second. The SI unit of electrochemical equivalent weight is $\mathrm{kg}$ $\mathrm{C}^{-1}$
MHT CET-03.05.2019
Some Basic Concepts of Chemistry
228193
The prefix $10^{18}$ is
1 giga
2 kilo
3 Exa
4 nano
Explanation:
Exa is a decimal unit prefix in the matric system. Exa $=10^{18}$, Giga $=10^9$ Kilo $=10^3$, Nano $=10^{-9}$
BITSAT 2015
Some Basic Concepts of Chemistry
228196
The value of which of the following unit of concentration will not change with the change in temperature?
1 Molarity
2 Molality
3 Normality
4 Formality
Explanation:
Molality $=\frac{\text { Moles of solute }}{\text { Mass of solvent in } \mathrm{kg}}$ Molality of concentration will not change with the change in temperature because in molality both moles of solute and mass of solvent are independent of temperature. Thus, molality is independent of temperature. Molarity (M) is the amount of a substance in a certain volume of solution. Molarity is defined as the moles of a solute per litres of a solution. Normality is a measure of concentration equal to the gram equivalent weight per litre of solution. Formality is a substance's total concentration in solution without regard to its specific chemical form.
GUJCET-2019
Some Basic Concepts of Chemistry
228201
Which symbol replaces the unit of atomic mass, amu?
1 $\mathrm{u}$
2 $\mathrm{A}$
3 $\mathrm{M}$
4 $\mathrm{n}$
Explanation:
u symbol represent the unit of atomic mass, amu. Where, $\mathrm{a}=$ Atomic mass number $\mathrm{m}=$ Molecular mass of the molecule. $\mathrm{n}=$ Number of atoms
MHT CET-2018
Some Basic Concepts of Chemistry
228202
Which one of the following statements is not correct?
1 The hydration enthalpies of alkali metal ions decrease down the group
2 Lithium halides are some what covalent in nature
3 Alkali metals react with water liberating oxygen gas
4 $\mathrm{KO}_2$ is paramagnetic
Explanation:
Alkali metal reacts with water to give metal hydroxide and hydrogen. $2 \mathrm{M}+2 \mathrm{H}_2 \mathrm{O} \longrightarrow 2 \mathrm{MOH}+\mathrm{H}_2(\mathrm{~g}) \text {. }$ alkali metal
228198
The SI unit of electrochemical equivalent is
1 $\mathrm{J} \mathrm{s}^{-1}$
2 $\mathrm{kg} \mathrm{C}^{-1}$
3 $\mathrm{kg} \mathrm{m} \mathrm{s}^{-2}$
4 $\mathrm{kg} \mathrm{m}^{-1} \mathrm{~s}^{-2}$
Explanation:
Electrochemical equivalent is the mass of the substance deposited to one of the electrodes when a current of 1 ampere is passed for 1 second. The SI unit of electrochemical equivalent weight is $\mathrm{kg}$ $\mathrm{C}^{-1}$
MHT CET-03.05.2019
Some Basic Concepts of Chemistry
228193
The prefix $10^{18}$ is
1 giga
2 kilo
3 Exa
4 nano
Explanation:
Exa is a decimal unit prefix in the matric system. Exa $=10^{18}$, Giga $=10^9$ Kilo $=10^3$, Nano $=10^{-9}$
BITSAT 2015
Some Basic Concepts of Chemistry
228196
The value of which of the following unit of concentration will not change with the change in temperature?
1 Molarity
2 Molality
3 Normality
4 Formality
Explanation:
Molality $=\frac{\text { Moles of solute }}{\text { Mass of solvent in } \mathrm{kg}}$ Molality of concentration will not change with the change in temperature because in molality both moles of solute and mass of solvent are independent of temperature. Thus, molality is independent of temperature. Molarity (M) is the amount of a substance in a certain volume of solution. Molarity is defined as the moles of a solute per litres of a solution. Normality is a measure of concentration equal to the gram equivalent weight per litre of solution. Formality is a substance's total concentration in solution without regard to its specific chemical form.
GUJCET-2019
Some Basic Concepts of Chemistry
228201
Which symbol replaces the unit of atomic mass, amu?
1 $\mathrm{u}$
2 $\mathrm{A}$
3 $\mathrm{M}$
4 $\mathrm{n}$
Explanation:
u symbol represent the unit of atomic mass, amu. Where, $\mathrm{a}=$ Atomic mass number $\mathrm{m}=$ Molecular mass of the molecule. $\mathrm{n}=$ Number of atoms
MHT CET-2018
Some Basic Concepts of Chemistry
228202
Which one of the following statements is not correct?
1 The hydration enthalpies of alkali metal ions decrease down the group
2 Lithium halides are some what covalent in nature
3 Alkali metals react with water liberating oxygen gas
4 $\mathrm{KO}_2$ is paramagnetic
Explanation:
Alkali metal reacts with water to give metal hydroxide and hydrogen. $2 \mathrm{M}+2 \mathrm{H}_2 \mathrm{O} \longrightarrow 2 \mathrm{MOH}+\mathrm{H}_2(\mathrm{~g}) \text {. }$ alkali metal
228198
The SI unit of electrochemical equivalent is
1 $\mathrm{J} \mathrm{s}^{-1}$
2 $\mathrm{kg} \mathrm{C}^{-1}$
3 $\mathrm{kg} \mathrm{m} \mathrm{s}^{-2}$
4 $\mathrm{kg} \mathrm{m}^{-1} \mathrm{~s}^{-2}$
Explanation:
Electrochemical equivalent is the mass of the substance deposited to one of the electrodes when a current of 1 ampere is passed for 1 second. The SI unit of electrochemical equivalent weight is $\mathrm{kg}$ $\mathrm{C}^{-1}$
MHT CET-03.05.2019
Some Basic Concepts of Chemistry
228193
The prefix $10^{18}$ is
1 giga
2 kilo
3 Exa
4 nano
Explanation:
Exa is a decimal unit prefix in the matric system. Exa $=10^{18}$, Giga $=10^9$ Kilo $=10^3$, Nano $=10^{-9}$
BITSAT 2015
Some Basic Concepts of Chemistry
228196
The value of which of the following unit of concentration will not change with the change in temperature?
1 Molarity
2 Molality
3 Normality
4 Formality
Explanation:
Molality $=\frac{\text { Moles of solute }}{\text { Mass of solvent in } \mathrm{kg}}$ Molality of concentration will not change with the change in temperature because in molality both moles of solute and mass of solvent are independent of temperature. Thus, molality is independent of temperature. Molarity (M) is the amount of a substance in a certain volume of solution. Molarity is defined as the moles of a solute per litres of a solution. Normality is a measure of concentration equal to the gram equivalent weight per litre of solution. Formality is a substance's total concentration in solution without regard to its specific chemical form.
GUJCET-2019
Some Basic Concepts of Chemistry
228201
Which symbol replaces the unit of atomic mass, amu?
1 $\mathrm{u}$
2 $\mathrm{A}$
3 $\mathrm{M}$
4 $\mathrm{n}$
Explanation:
u symbol represent the unit of atomic mass, amu. Where, $\mathrm{a}=$ Atomic mass number $\mathrm{m}=$ Molecular mass of the molecule. $\mathrm{n}=$ Number of atoms
MHT CET-2018
Some Basic Concepts of Chemistry
228202
Which one of the following statements is not correct?
1 The hydration enthalpies of alkali metal ions decrease down the group
2 Lithium halides are some what covalent in nature
3 Alkali metals react with water liberating oxygen gas
4 $\mathrm{KO}_2$ is paramagnetic
Explanation:
Alkali metal reacts with water to give metal hydroxide and hydrogen. $2 \mathrm{M}+2 \mathrm{H}_2 \mathrm{O} \longrightarrow 2 \mathrm{MOH}+\mathrm{H}_2(\mathrm{~g}) \text {. }$ alkali metal
