Recent questions tagged ch2

If a and b are two whole numbers, then commutative law is applicable to subtraction if and only if .

asked Aug 1, 2016 by meena.p

2 answers

Which of the following expression in INCORRECT ?

asked Aug 1, 2016 by meena.p

1 answer

Subtract the number obtained by reversing the digits of the number $20198$ from the number obtained by interchanging the digits in the units place and the hundred's place of the same number , we get

asked Aug 1, 2016 by meena.p

1 answer

While removing brackets, the order in which the brackets are removed is __________

asked Aug 1, 2016 by meena.p

1 answer

Find the sum of the given expression. $(-172)+40+5+(-425) +(-275)+600-(-15)$

asked Aug 1, 2016 by meena.p

2 answers

if a solute under goes dimerization and trimerizaton, the minimum values of the van't hoff factors are

asked Jul 4, 2015 by excellentdeals18

1 answer

An electron starting from rest has a velocity that increases linearly with time i.e $v= kt$ where $k=2\;m\;s^{-2}$. The distance covered in the first 3 second is

asked Aug 19, 2014 by meena.p

1 answer

The time taken by a pendulum to complete 20 vibrations is $88.0 $ second. The time period of the pendulum is

asked Aug 12, 2014 by meena.p

1 answer

A system takes $70.40 \;seconds$ to complete 20 oscillations. the time period of the system is :

asked Aug 12, 2014 by meena.p

1 answer

If the value of the resistance is $10.845 \Omega$ and the value of the current is $ 3.23$ ampere, then the potential difference is $35.02935$ volt. Its value in correct significant figures would be

asked Aug 12, 2014 by meena.p

1 answer

The mass of a box is $23\;g$ . Two gold pieces , each of mass $0.035\;g$ , are placed in it. The total mass of the box and gold pieces is

asked Aug 12, 2014 by meena.p

1 answer

A current of $2.34 $ ampere flows in a resistance of $11.111111 \Omega$ The potential difference across the given resistance with due to regard for significant figures is

asked Aug 12, 2014 by meena.p

1 answer

The radius of a wire is $0.24 \;mm$ . Then its area of cross- section by taking significant figures into consideration is

asked Aug 12, 2014 by meena.p

1 answer

The length of a cube is $ 2.1 \times 10^{-2}\;m$ . The volume in significant figures will be

asked Aug 12, 2014 by meena.p

1 answer

There are atomic clocks capable of measuring time with an accuracy of 1 part in $10^{11}$. If two such clocks are operated with precision , then after running for $5000\;year$ these will record.

asked Aug 12, 2014 by meena.p

1 answer

The effective length of a simple pendulum is the sum of the following three length of string , radius of bob, length of hook. In a simple pendulum experiment , the length of the string, as measured by a metre scale is $92.0\;cm$ . The radius of the bob combined with the length of the hook, as measured by a vernier callipers is $2.15\;cm$ The effective length of the pendulum is

asked Aug 12, 2014 by meena.p

1 answer

A sample of wustite $Fe_xO$ contains one $Fe(III)$ for every three $Fe(II).$ Calculate the value of x.

asked Aug 11, 2014 by meena.p

1 answer

The composition of a sample of wiistite is $Fe_{0.93} O_{1.00-}$. What percentage of the ion is present in the form of $Fe(III)?$

asked Aug 11, 2014 by meena.p

1 answer

Calculate the percentage of void volume in the body centred

asked Aug 11, 2014 by meena.p

1 answer

Calculate the percentage of void volume in the primitive

asked Aug 11, 2014 by meena.p

1 answer

Lil occurs as cubical - closest packing . If the edge length of a unit cell is $624\;pm$ , determine the ionic radii of $Li^{+}$ and $I^{-}$ ions.

asked Aug 11, 2014 by meena.p

1 answer

KCl crystallizes in the same type of lattice as does $NaCl$ . Given that $\large\frac{r_{Na^{+}}}{r_{cl^{-}}}$$=0.5$ and $\large\frac{r_{Na^{+}}}{r_{K^{+}}}$$=0.5$ calculate the ratio of density of NaCl to that KCl

asked Aug 11, 2014 by meena.p

1 answer

KCl crystallizes in the same type of lattice as does $NaCl$ . Given that $\large\frac{r_{Na^{+}}}{r_{cl^{-}}}$$=0.5$ and $\large\frac{r_{Na^{+}}}{r_{K^{+}}}$$=0.5$ calcute the ratio of the unit cell for $KCl$ to that for $NaCl$

asked Aug 11, 2014 by meena.p

1 answer

If the radius of $Cs^{+}$ is $169\;pm$ and that of $Cl^{-}$ is $181\;pm$ , predict the structure of $CsCl$. What is the coordination number of $Cs^{+}$ ion ?

asked Aug 11, 2014 by meena.p

1 answer

A solid $A^{+}B^{-}$ has an $NaCl$ type closet packed structure . If the radius of the anion is $250\;pm$ What is the radius of the cation ?

asked Aug 8, 2014 by meena.p

1 answer

The atomic radius of stronitum is $215\;pm$ and it crystallizes with a cubical closest - packed structure . Calculate the density of strontium. The molar mass of strontium is $ 87.6\;g\;mol^{-1}$

asked Aug 8, 2014 by meena.p

1 answer

Caesium chloride may be considered to form interpenetrating simple primitive cubic crystals. The edge length of unit cell is $412\;pm$. Determine the ionic radius of $Cs^{+}$ if the ionic radius of $Cl^{-}$ if the ionic radius of $Cl^{-}$ is $181$ P.m Given $M(C_s)=133\;g\;mol^{-1}$

asked Aug 8, 2014 by meena.p

1 answer

Caesium chloride may be considered to form interpenetrating simple primitive cubic crystals. The edge length of unit cell is $412\;pm$. Determine the density of $CsCl$

asked Aug 8, 2014 by meena.p

1 answer