Recent questions tagged easy

Calculate the mass of $CaO$ that shall be obtained by heating 20 kg of 80 % pure lime-stone $(CaCO_3)$

asked Oct 30, 2013 by sreemathi.v

1 answer

How many EDTA (ethylene diamine tetracetic acid)molecules are required to make an octahedral complex with a $Ca^{2+}$ ion ?

asked Oct 30, 2013 by sreemathi.v

2 answers

The points with position vectors $60\hat i+3\hat j,\:70\hat i-8\hat j\:and\:a\hat i-52\hat j$ are collinear if $a=?$

asked Oct 29, 2013 by rvidyagovindarajan_1

1 answer

$[\overrightarrow a\:\:\overrightarrow b\:\:\overrightarrow a\times\overrightarrow b]$=?

asked Oct 29, 2013 by rvidyagovindarajan_1

1 answer

$(\hat i\:\hat j\:\hat k)+(\hat j\:\hat k\: \hat i)+(\hat k\:\hat j\:\hat i)=?$

asked Oct 28, 2013 by rvidyagovindarajan_1

1 answer

If $\theta$ is the angle between the vectors $\overrightarrow a$ and $\overrightarrow b$, and $ |\overrightarrow a.\overrightarrow b|=|\overrightarrow a\times\overrightarrow b|$, then $\theta$=?

asked Oct 28, 2013 by rvidyagovindarajan_1

1 answer

Which of one of the following is a vector?

asked Oct 28, 2013 by rvidyagovindarajan_1

1 answer

The molality of 1M solution of NaCl (specific gravity $1.0585g/ml$) is :

asked Oct 28, 2013 by sreemathi.v

1 answer

Total number of atoms present in $1.0cm^3$ of solid urea (density 0.3g/$cm^3$) at $25^{\large\circ}$ are

asked Oct 28, 2013 by sreemathi.v

1 answer

Which of the following changes with increases in temperature?

asked Oct 28, 2013 by sreemathi.v

1 answer

$^nC_0.^nC_1$ + $^nC_1.^nC_2$ + $....^nC_{n-1}.^nC_n$ = ?

asked Oct 27, 2013 by rvidyagovindarajan_1

1 answer

If the $4^{th}$ term in the expansion of $\big(x^2-\large\frac{1}{x^3}\big)^n$ is independent of $x$, then $n=?$

asked Oct 26, 2013 by rvidyagovindarajan_1

1 answer

The remainder when $5^{99}$ is divided by $13$ is

asked Oct 26, 2013 by rvidyagovindarajan_1

1 answer

$\large\frac{^8C_0}{6}$ - $^8C_1$ + $^8C_2.6$ + $....$ + $^8C_8.6^7$ = ?

asked Oct 26, 2013 by rvidyagovindarajan_1

1 answer

$\large\frac{2}{3}$ of the atoms in water molecule are hydrogen .What % weight of a water molecule is the weight of 2 hydrogen atoms:

asked Oct 25, 2013 by sreemathi.v

1 answer

Which has the maximum number of atom

asked Oct 22, 2013 by sreemathi.v

1 answer

Which of the following two oxide of nitrogen have 30.5% nitrogen

asked Oct 22, 2013 by sreemathi.v

1 answer

Which of the following alkanes has 75% of carbon?

asked Oct 22, 2013 by sreemathi.v

1 answer

$\sum^{n} _ {r=0} r. \: ^nCr$ = ?

asked Oct 22, 2013 by rvidyagovindarajan_1

1 answer

$\sum^{n} _ {r=0} r. ^nCr$=?

asked Oct 22, 2013 by rvidyagovindarajan_1

0 answers

Which pair of species has same percentage of carbon?

asked Oct 22, 2013 by sreemathi.v

1 answer

It is found that 16.5g of metal combine with oxygen to form 35.6g of metal oxide.Calculate the percentage of metal and oxygen in the compound.

asked Oct 22, 2013 by sreemathi.v

1 answer

An unknown element forms an oxide.What will be the equivalent mass of the element if the oxygen content is 20% by mass ?

asked Oct 22, 2013 by sreemathi.v

1 answer

A piece of copper weighs $0.635g.$How many atoms of copper does it contain?

asked Oct 22, 2013 by sreemathi.v

1 answer

$25g$ of $MCl_4$ contains $0.5\;mol$ chlorine then its molecular mass is

asked Oct 22, 2013 by sreemathi.v

1 answer

The number of dissimilar terms in the expansion of $(x_1+x_2+.....x_n)^3$ is ?

asked Oct 22, 2013 by rvidyagovindarajan_1

1 answer

The maximum number of molecules present in :

asked Oct 22, 2013 by sreemathi.v

1 answer

3g of hydrocarbon on combustion with 11.2g of oxygen produce 8.8g of $CO_2$ and 5.4g of $H_2O$.The data illustrates the law of

asked Oct 22, 2013 by sreemathi.v

1 answer

The coefficient if $x^{10}$ in the expansion $(1+x^2-x^3)^8$ is ?

asked Oct 21, 2013 by rvidyagovindarajan_1

1 answer

If $A+B+C=\pi$ then $\cos^2A+\cos^2B+\cos^2C$ is equal to

asked Oct 21, 2013 by sreemathi.v

1 answer

The sum of last $30$ coefficients in the expansion of $(1+x)^{59}$ when expanded in ascending power of $x$ is ?

asked Oct 19, 2013 by rvidyagovindarajan_1

1 answer

$(1+x)^n-nx-1$ is divisible by ?

asked Oct 16, 2013 by rvidyagovindarajan_1

1 answer

The remainder when $2^{2003}$ is divided by $17$ is ?

asked Oct 16, 2013 by rvidyagovindarajan_1

1 answer

The coeff. of $x^n$ in the expansion of $(1+x)(1-x)^n$ is ?

asked Oct 14, 2013 by rvidyagovindarajan_1

1 answer