Recent questions in Chemistry

When XeF$_4$ reacts with water, which of the following are possible product(s) that can be formed? Xe, HF, XeO$_3$, XeOF$_3$, XeO$_4$, O$_3$.

asked Jul 27, 2014 by balaji.thirumalai

1 answer

Match the following:

asked Jul 27, 2014 by balaji.thirumalai

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Xe$_4$ and Xe$_6$ are expected to be:

asked Jul 27, 2014 by balaji.thirumalai

1 answer

The structure of XeO$_3$ is

asked Jul 27, 2014 by balaji.thirumalai

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Why is argon used in arc welding?

asked Jul 27, 2014 by balaji.thirumalai

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Which of the following regarding Helium is incorrect?

asked Jul 27, 2014 by balaji.thirumalai

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The number of water of crystallization in Borax is

asked Jul 27, 2014 by thanvigandhi_1

1 answer

In Borax, the number of -OH group attached to boron atoms is

asked Jul 27, 2014 by thanvigandhi_1

1 answer

Borax has the molecular formula

asked Jul 27, 2014 by thanvigandhi_1

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Which of the following statement is correct ?

asked Jul 27, 2014 by thanvigandhi_1

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Which of the following statement is not correct ?

asked Jul 27, 2014 by thanvigandhi_1

1 answer

Which of the following statement is incorrect ?

asked Jul 27, 2014 by thanvigandhi_1

1 answer

Heating of diborane with excess of ammonia to a high temperature yields

asked Jul 27, 2014 by thanvigandhi_1

1 answer

Chrome alum is

asked Jul 26, 2014 by thanvigandhi_1

1 answer

Heating of $Al_2(SO_4)_3$ gives

asked Jul 26, 2014 by thanvigandhi_1

1 answer

Which of the following alloys does not contain aluminium ?

asked Jul 26, 2014 by thanvigandhi_1

1 answer

For the reaction $A+B \rightarrow C+D$, calculate the value of k for this reaction based on the following data collected in three different experiments:

asked Jul 25, 2014 by balaji.thirumalai

1 answer

The activation energy for a certain reaction is 76.7 kJ mol$^{-1}$. How many times faster will the reaction occur at 50$^\circ$C compared to 0$^\circ$C?

asked Jul 25, 2014 by balaji.thirumalai

1 answer

Calculate the value of k for this reaction based on the following data collected in three different experiments:

asked Jul 25, 2014 by balaji.thirumalai

1 answer

The rate constant of a reaction at 32$^\circ$C is 0.055 s$^{-1}$. If the frequency or pre-exponential factor is 1.2 $\times$ 10$^{13}$ s$^{-1}$, what is the activation energy?

asked Jul 25, 2014 by balaji.thirumalai

1 answer

If a temperature increase from 20$^\circ$C to 35$^\circ$C triples the rate constant for a reaction, what is the value of the activation barrier for the reaction?

asked Jul 25, 2014 by balaji.thirumalai

1 answer

The rate constant (k) for a reaction was determined as a function of temperature. A plot of $ln\; k$ versus $ \large\frac{1}{T}$ (in $K$) is linear and has a slope of $-1.01 \times 10^{4}\;K$. Calculate the activation energy for the reaction.

asked Jul 25, 2014 by balaji.thirumalai

1 answer

Which of the following statements regarding the structure aluminium chloride is correct ?

asked Jul 25, 2014 by thanvigandhi_1

1 answer

The chief ore for the extraction of aluminium is

asked Jul 25, 2014 by thanvigandhi_1

1 answer

Which of the following minerals does not contain aluminium ?

asked Jul 25, 2014 by thanvigandhi_1

1 answer

The elements $_{30}Zn,_{48}Cd$ and $_{80}Hg$ belong to

asked Jul 25, 2014 by sreemathi.v

1 answer

Which of the following is metaboric acid ?

asked Jul 25, 2014 by thanvigandhi_1

1 answer

The atomic number of In is 49.It belongs to

asked Jul 25, 2014 by sreemathi.v

1 answer

An element X belongs to Group 16 and $5^{th}$ period.Its atomic number is

asked Jul 25, 2014 by sreemathi.v

1 answer

Which of the following is boric acid ?

asked Jul 25, 2014 by thanvigandhi_1

1 answer

Which of the following statements regarding Boron is not correct ?

asked Jul 25, 2014 by thanvigandhi_1

1 answer

The atomic numbers of elements of the lanthanide series lie in the range of

asked Jul 25, 2014 by sreemathi.v

1 answer

Which of the following statements regarding boron is not correct ?

asked Jul 25, 2014 by thanvigandhi_1

1 answer

The total number of elements in Groups 8 to 10 of the periodic table is

asked Jul 25, 2014 by sreemathi.v

1 answer

The treatment of $Mg_3B_2$ with acids produces

asked Jul 25, 2014 by thanvigandhi_1

1 answer

The atomic numbers of elements of the second inner transition elements lie in the range of

asked Jul 25, 2014 by sreemathi.v

1 answer

Which of the following facts regarding boron and silicon is not true ?

asked Jul 25, 2014 by thanvigandhi_1

1 answer

An element X belongs to Group 14 and $2^{nd}$ period of the periodic table.Its atomic number will be

asked Jul 25, 2014 by sreemathi.v

1 answer

The number of elements in the fourth period of the periodic table is

asked Jul 25, 2014 by sreemathi.v

1 answer

The atomic number of element next to $_{53}I$ in the same group is

asked Jul 25, 2014 by sreemathi.v

1 answer

Which of the following equations is not correctly formulated ?

asked Jul 25, 2014 by thanvigandhi_1

1 answer

The elements with atomic numbers 21 to 30 belong to

asked Jul 25, 2014 by sreemathi.v

1 answer

The number of periods in the long form of periodic table is

asked Jul 25, 2014 by sreemathi.v

1 answer

In Lother Meyer plot of atomic volume versus atomic mass,the peaks are occupied by

asked Jul 25, 2014 by sreemathi.v

1 answer

In the sixth period,the orbitals being filled are

asked Jul 25, 2014 by sreemathi.v

1 answer

The fifth period of modern periodic table includes

asked Jul 25, 2014 by sreemathi.v

1 answer

The oxidation state of Sc in $Sc_2Si_2O_7$ is

asked Jul 25, 2014 by sreemathi.v

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The charge $x$ of $Si_6O_{18}^x$ will be

asked Jul 25, 2014 by sreemathi.v

1 answer

Which one of the following is a covalent carbide?

asked Jul 25, 2014 by sreemathi.v

1 answer

Each silicon atom in the trimer cyclic silicate has

asked Jul 25, 2014 by sreemathi.v

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