Recent questions tagged 99

Which of these following methods is the most suitable for disposal of nuclear waste ?

asked Jul 8, 2019 by pady_1

1 answer

Which of the following does not participate in the Solvay's process for the manufacture of $Na_2CO_3$ ?

asked Dec 19, 2018 by pady_1

0 answers

The electronic configuration of sodium is :

asked Dec 19, 2018 by pady_1

0 answers

Which of the following is Lucas reagent ?

asked Dec 19, 2018 by pady_1

0 answers

Consider the following reaction : $A \to products$ This reaction is completed in 100 minutes. The rate constant of this reaction at $t_1 =10\; min$, is $10^{-2} \;min^{-1}$. What is the rate constant (in $min^{-1}$) at $t_2 = 20 $ minutes ?

asked Dec 11, 2018 by pady_1

0 answers

In a mixture of A and B, components show negative deviation when :

asked Dec 11, 2018 by pady_1

0 answers

What volume of hydrogen gas, at 273 K and 1 atm pressure will be consumed in obtaining 21.6 g of elemental boron (atomic mass = 10.8) from the reduction of boron trichloride by hydrogen ?

asked Dec 11, 2018 by pady_1

0 answers

An experiment is performed to find the refractive index of glass using a travelling microscope. In this experiment distance are measured by

asked Nov 29, 2018 by pady_1

0 answers

A radioactive element gets spilled over the floor of a room. Its half-life period is 30 days. If the initial activity is ten times the permissible value, after how many days will it be safe to enter the room ?

asked Nov 29, 2018 by pady_1

1 answer

Following statements regardinng the periodic trends of chemical reactivity of the alkali metals and the halogens are given. Which of these statements gives the correct picture ?

asked Nov 13, 2018 by pady_1

0 answers

Two solutions of a substance (non electrolyte) are mixed in the following manner. 480 mL of 1.5 M first solution + 520 mL of 1.2 M second solution. What is the molarity of the final mixture ?

asked Nov 5, 2018 by pady_1

0 answers

What type of crystal defect is indicated in the diagram below ?

asked Nov 5, 2018 by pady_1

1 answer

Which one of the following plants shows a very close relationship with a species of moth, where none of the two can complete its life cycle without the other ?

asked Aug 21, 2018 by pady_1

2 answers

The genotypes of a Husband and Wife are $I^A I^B$ and $I^A i$. Among the blood types of their children, how many different genotypes and phenotypes are possible?

asked Aug 21, 2018 by pady_1

1 answer

It is much easier for a small animals to run uphill than for a large animal, because -

asked Aug 21, 2018 by pady_1

1 answer

A jawless fish, which lays eggs in fresh water and whose ammocoetes larvae after metamorphosis return to the ocean is :

asked Aug 21, 2018 by pady_1

1 answer

You are given a fairly old piece of dicot stem and a dicot root. Which of the following anatomical structures will your use to distinguish between the two?

asked Aug 20, 2018 by pady_1

1 answer

In china rose the flowers are :

asked Aug 20, 2018 by pady_1

1 answer

Which of the following statements is false ?

asked Aug 20, 2018 by pady_1

1 answer

Which one of the following statements is not true regarding (+) Lactose ?

asked Aug 16, 2018 by pady_1

1 answer

Which one of the following molecular hydrides acts as a Lewis acid?

asked Jul 26, 2018 by pady_1

1 answer

The segment of DNA which acts as the instrument manual for the synthesis of the protein is :

asked Jul 26, 2018 by pady_1

1 answer

Standard free energies of formation (in kJ/mol) at 298 K are -237.2, -394.4 and -8.2 for $H_2O(l)$, $CO_2 (g)$ and pentane(g) respectively The value of $E^o$ cell for the pentane-oxygen fuel cell is:

asked Jul 26, 2018 by pady_1

0 answers

RNA and DNA are chiral molecules, their chirality is due to :

asked Jul 26, 2018 by pady_1

1 answer

Which of the following is not isostructural with $SiCl_4$:-

asked Jul 25, 2018 by pady_1

0 answers

$H_2 S$ gas when passed through a solution of cations containing HCl precipitates the cations of second group of qualitative analysis but not those belonging to the fourth group. It is because-

asked Jul 24, 2018 by pady_1

1 answer

The work done during the expansion of a gas from a volume of $4 dm^{ 3}$ to $6 dm^{ 3}$ against a constant external pressure of 3 atm is :-

asked Jul 24, 2018 by pady_1

1 answer

Phospholipids are esters of glycerol with :-

asked Jul 24, 2018 by pady_1

1 answer

When $CH_3CH_2CHCl_2$ is treated with $NaNH_2$, the product formed is : -
are

asked Jul 23, 2018 by pady_1

1 answer

Solubility of a $M_2S$ salt is $3.5 \times 10^{–6}$ then find out solubility product : -

asked Jul 20, 2018 by pady_1

1 answer

Oxidation numbers of A, B and C are + 2, +5 and – 2 respectively possible formula of compound is :

asked Jul 20, 2018 by pady_1

1 answer

The second order Bragg diffraction of X-rays with $\lambda$ = 1.00 Å from a set of parallel planes in a metal occurs at an angle 60º. The distance between the scattering planes in the crystal is :

asked Jun 15, 2018 by pady_1

1 answer

How many lines of symmetry does a rhombus have?

asked Dec 31, 2015 by pady_1

1 answer

Find the cost of painting square board of side 44 cm at the rate of Rs.7 per sq. cm.

asked Dec 31, 2015 by pady_1

1 answer

John read the quarter of the time that Tom read. Tom read only two-fifth of the time that Sasha read. Sasha read twice as long as Mike. If Mike read 5 hours, how long did John read?

asked Dec 31, 2015 by pady_1

1 answer

If the distance covered by a train is 360 km in 4 hours, find its speed.

asked Dec 31, 2015 by pady_1

1 answer

Ask Questions, Get Answers

Which of these following methods is the most suitable for disposal of nuclear waste ?

Which of the following does not participate in the Solvay's process for the manufacture of $Na_2CO_3$ ?

The electronic configuration of sodium is :

Which of the following is Lucas reagent ?

Consider the following reaction : <br> $A \to products$ <br> This reaction is completed in 100 minutes. The rate constant of this reaction at $t_1 =10\; min$, is $10^{-2} \;min^{-1}$. What is the rate constant (in $min^{-1}$) at $t_2 = 20 $ minutes ?

In a mixture of A and B, components show negative deviation when :

What volume of hydrogen gas, at 273 K and 1 atm pressure will be consumed in obtaining 21.6 g of elemental boron (atomic mass = 10.8) from the reduction of boron trichloride by hydrogen ?

An experiment is performed to find the refractive index of glass using a travelling microscope. In this experiment distance are measured by

A radioactive element gets spilled over the floor of a room. Its half-life period is 30 days. If the initial activity is ten times the permissible value, after how many days will it be safe to enter the room ?

Following statements regardinng the periodic trends of chemical reactivity of the alkali metals and the halogens are given. Which of these statements gives the correct picture ?

Two solutions of a substance (non electrolyte) are mixed in the following manner. <br> 480 mL of 1.5 M first solution + 520 mL of 1.2 M second solution. <br> What is the molarity of the final mixture ?

What type of crystal defect is indicated in the diagram below ? <br>

Which one of the following plants shows a very close relationship with a species of moth, where none of the two can complete its life cycle without the other ?

The genotypes of a Husband and Wife are $I^A I^B$ and $I^A i$. <br> Among the blood types of their children, how many different genotypes and phenotypes are possible?

It is much easier for a small animals to run uphill than for a large animal, because -

A jawless fish, which lays eggs in fresh water and whose ammocoetes larvae after metamorphosis return to the ocean is :

You are given a fairly old piece of dicot stem and a dicot root. Which of the following anatomical structures will your use to distinguish between the two?

In china rose the flowers are :

Which of the following statements is false ?

Which one of the following statements is not true regarding (+) Lactose ?

Which one of the following molecular hydrides acts as a Lewis acid?

The segment of DNA which acts as the instrument manual for the synthesis of the protein is :

Standard free energies of formation (in kJ/mol) at 298 K are -237.2, -394.4 and -8.2 for $H_2O(l)$, $CO_2 (g)$ and pentane(g) respectively The value of $E^o$ cell for the pentane-oxygen fuel cell is:

RNA and DNA are chiral molecules, their chirality is due to :

Which of the following is not isostructural with $SiCl_4$:-

$H_2 S$ gas when passed through a solution of cations containing HCl precipitates the cations of second group of qualitative analysis but not those belonging to the fourth group. It is because-

The work done during the expansion of a gas from a volume of $4 dm^{ 3}$ to $6 dm^{ 3}$ against a constant external pressure of 3 atm is :-

Phospholipids are esters of glycerol with :-

When $CH_3CH_2CHCl_2$ is treated with $NaNH_2$, the product formed is : -
are

Solubility of a $M_2S$ salt is $3.5 \times 10^{–6}$ then find out solubility product : -

Oxidation numbers of A, B and C are + 2, +5 and – 2 respectively possible formula of compound is :

The second order Bragg diffraction of X-rays with $\lambda$ = 1.00 Å from a set of parallel planes in a metal occurs at an angle 60º. The distance between the scattering planes in the crystal is :

How many lines of symmetry does a rhombus have?

Find the cost of painting square board of side 44 cm at the rate of Rs.7 per sq. cm.

John read the quarter of the time that Tom read. Tom read only two-fifth of the time that Sasha read. Sasha read twice as long as Mike. If Mike read 5 hours, how long did John read?

If the distance covered by a train is 360 km in 4 hours, find its speed.