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440 questions found
Which of the following ore is concentrated by froth-flotation process?
Hematite
Siderite
Galena
Malachite
What is general electronic configuration of transition metal?
(n−1)s²pd⁶d¹⁰ns⁰2
(n−1)s²p⁶ns²np¹
(n−1)s²p⁶d⁵ns¹
(n−1)d¹–¹⁰ns¹–²
What happens when the lead storage battery is discharged?
SO₂ is evolved
PbSO₄ is consumed
Lead is formed
H₂SO₄ is consumed
Arrange the given compounds according to their ascending order of acidic strength and justify your order.
CH₃CH₂COOH, C₆H₅COOH, ClCH₂CH₂COOH
When sodium phenoxide reacts with methyl bromide it gives
Cresol
Toluene
Benzene
Anisole
For which manufacturing process, Bessemer converter is used?
Pig iron
Steel
Wrought iron
Cast iron
For the given reactions:
(i)
(ii)
The enthalpy of formation of becomes
$2y - x$
$2x - y$
$\dfrac{y - 2x}{2}$
In a solution that is at equilibrium, what happens to the concentration of ions if the concentration of ions is increased?
The concentration of $\text{H}^+$ ions increases
The concentration of $\text{H}^+$ ions decreases
The concentration of $\text{H}^+$ ions stay the same
It depends on the initial concentration of ions
Identify the equivalent weight of in the following reaction?
$49$
$294$
$98$
$108$
Identify the in the following reaction:
$\text{Na}_2\text{S}$
$\text{Sn}/\text{HCl}$
$\text{LiAlH}_4$
Draw the energy profile diagram of exothermic and endothermic reaction.
Write down the structural formula and IUPAC name of tertiary alcohol with formula . How would you apply Victor Meyer’s method for the distinction of 1-propanol and 2-propanol? Explain.
Arrange the following in the decreasing order of their acidic strength and give reason for your answer:
$\text{CH}_3\text{COOH},\ \text{ClCH}_2\text{COOH},\ \text{FCH}_2\text{COOH}, \ \text{C}_6\text{H}_5\text{COOH}$ $(2)$
Addition polymer and condensation polymer
Convert: ethanamine to methanamine
Arrange the following amines in terms of increasing order of basic strength:
Propyl amine, ethyl methylamine, trimethylamine.
How can you separate ethylamine and dimethylamine present in mixture by Hoffmann’s method?
Give a test to distinguish alkyl amine and aryl amine.
Write a suitable test reaction to distinguish $A$ from methanoic acid.
Convert the isomer $A$ into isomer $B$?