Recent questions in Chemistry

Find Atomic number of element that has electron configuration lasting with $6p^2$

asked Jul 17, 2018 by sharmaaparna1

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Calculate the de Broglie wavelength of an electron moving with a velocity of $5.0\times10^5ms^{–1}$

asked Jul 17, 2018 by swapnarajan1982

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If ten volume of dihydrogen gas reacts with five volumes of dioxygen gas, how many volumes of water vapour could be produced ?

asked Jul 5, 2018 by meena.p

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If the speed of lights is $3.0 \times 10^{8}\;ms^{-1}$. calculate the distance covered by light in 2.00 ns

asked Jul 5, 2018 by meena.p

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If the density of methanol is $0.793\; kg L^{-1}$ what is its volume needed for making 2.5 L of its $0.25\;M$ solution ?

asked Jul 5, 2018 by meena.p

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One mole of $H_2O$ equals

asked Jul 5, 2018 by meena.p

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Relative molecular masses can be calculated

asked Jul 5, 2018 by meena.p

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__________ is mass of a particular substance divided by the total mass of all the substances present in the mixture or solution.

asked Jul 5, 2018 by meena.p

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A pseudo molecular weight computed by dividing the mass in a mixture or solution by the number of moles in the mixture or solution is called

asked Jul 4, 2018 by meena.p

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$40\; gms$ of $NaOH$ contains

asked Jul 4, 2018 by meena.p

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58.5 gms of NaCl contains

asked Jul 4, 2018 by meena.p

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Amount of substance containing $6.022 \times 10^{23}$ entities is called

asked Jul 4, 2018 by meena.p

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The law of _____________ states that chemical reactions proceed with fix ratios of the number of reactant and products and products involved in the reaction.

asked Jul 4, 2018 by meena.p

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The given statement for stoichiometry is “Stoichiometry provides a quantitative means of relating the amount of products produced by a chemical reaction to amount of reaction and vice versa."

asked Jul 4, 2018 by meena.p

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Nitric acid formation reaction is given as below $3NO_2 + H_2O \to 2HNO3 + NO$ The given reaction is

asked Jul 4, 2018 by meena.p

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A 12.0 of gas sample of gas occupies $19.2\;L$ at STP. what is the molecule weight of this gas ?

asked Jul 3, 2018 by meena.p

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A molar solution is one that contains one mole of a solute in

asked Jul 3, 2018 by meena.p

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Which one of the following pairs of gases contains the same number of molecules

asked Jul 3, 2018 by meena.p

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How much copper can be obtained from 100 g of copper sulphate $(CuSO_4)?$ (Atomic mass of $Cu=63.5\;amu$)

asked Jul 3, 2018 by meena.p

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Calculate the mass of sodium acetate $(CH_3COONa)$ required to make 500 mL of $0.375$ molar aqueous solution . Molar mass of sodium acetate is $82.0245\;g\;mol^{-1}$

asked Jul 3, 2018 by meena.p

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$60\;cm^3$ of oxygen was added to $24\;cm^3$ of carbon monoxide and the mixture is ignited. calculate (i) the volume of oxygen used up (ii) the volume of carbon dioxide fromed .

asked Jul 2, 2018 by meena.p

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From the equation :$N_2+3H_22NH_3$ calculate the volume of ammonia gas formed when 6 litres of hydrogen reacts with excess of nitrogen , all volumes being measured at $STP$

asked Jul 2, 2018 by meena.p

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Which ones of the following statements are true for 2 moles $CO_2$ compound. (Avogadro's Number $=6,02 \times 10^{23})$

asked Jul 2, 2018 by meena.p

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Calculate number of bromide ions in 3 moles of mercury (II) bromide

asked Jul 2, 2018 by meena.p

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How many moles of molecule are present in 15 g of $C_2H_4$(ethylene) . Given atomic mass of $C=12.0\;amu$ and of $H=1.0\;amu$

asked Jul 2, 2018 by meena.p

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Calculate the number of molecules present in 34.20 grams of cane sugar $(C_{12}H_{22}O_{11})$

asked Jul 2, 2018 by meena.p

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The conversion of $PbO_2$ to $Pb(NO_3)_2$ is

asked Jun 29, 2018 by meena.p

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How many electrons are involved in oxidation by $KMnO_4$ in basic medium

asked Jun 29, 2018 by meena.p

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For $H_3PO_3$ and $H_3PO_4$ the correct choice is

asked Jun 29, 2018 by meena.p

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$H_2S$ acts only as a reducing agent while $SO_2$ can act both as a reducing and oxidizing agent because

asked Jun 29, 2018 by meena.p

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Among the following compound the oxidation state of Mn is highest in

asked Jun 29, 2018 by meena.p

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In a aqueous solution , hydrogen will not reduce

asked Jun 29, 2018 by meena.p

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When $Cl_2$ gas reacts with hot and concentrated sodium hydroxide solution, the oxidation number of chlorine changes from

asked Jun 29, 2018 by meena.p

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In which of the following compounds, nitrogen exhibits highest oxidation state ?

asked Jun 29, 2018 by meena.p

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In which of the following acid, which acid has oxidation reduction and complex formation properties

asked Jun 29, 2018 by meena.p

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Oxidizing agents

asked Jun 28, 2018 by meena.p

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Old paintings can be restored through an oxidizing agent

asked Jun 28, 2018 by meena.p

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In the course of a chemical reaction an oxidant

asked Jun 28, 2018 by meena.p

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Excess of KI reacts with $CuSo_4$ solution and then $Na_2S_2O_3$ solution is added to it. Which of the statements is incorrect for this reaction ?

asked Jun 28, 2018 by meena.p

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The conversion of $PbO_2$ to $Pb(NO_3)_2$ is

asked Jun 28, 2018 by meena.p

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In the reaction $H_2S+NO_2 \to H_2O+NO+S.H_2S$ is

asked Jun 28, 2018 by meena.p

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When P reacts with caustic soda, the products are $PH_3$ and $NaH_2PO_2$. This reaction is an example of

asked Jun 28, 2018 by meena.p

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One mole of $N_2H_4$ loses 10 mole electrons to form a new compound Y. Assuming that all the $N_2$ appears in new compound, what is the oxidation state of Nitrogen in Y? (There is no change in the oxidation state of H)

asked Jun 28, 2018 by meena.p

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Consider: $CH_{4(g)} + 2O_{2 (g)} \to CO_{2 (g)} + 2H_2O_{ (g)}$ Determine what was oxidized and what was reduced.

asked Jun 28, 2018 by meena.p

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The process in which oxidation number increases is known as

asked Jun 28, 2018 by meena.p

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The most active nonmetallic element is

asked Jun 28, 2018 by meena.p

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In the reaction between ozone and hydrogen peroxide, $H_2O_2$ acts as

asked Jun 28, 2018 by meena.p

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A metal ion $M^{3+}$ after loss of three electrons in a reaction will have an oxidation number equal to

asked Jun 28, 2018 by meena.p

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$C_2H_6(g)+nO_2 \to CO_2(g)+H_2O(l)$ In this equation, the ratio of the coefficients of $CO_2$ and $H_2O$ is

asked Jun 28, 2018 by meena.p

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The value of x in the partial redox equation $MnO^{−4}+8H^{+} + xe ⇌ Mn^{2+}+4H2O$ is

asked Jun 28, 2018 by meena.p

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